diff --git a/dev/manual_tests/lib/star_border.dart b/dev/manual_tests/lib/star_border.dart
index 7a4e893..70e8623 100644
--- a/dev/manual_tests/lib/star_border.dart
+++ b/dev/manual_tests/lib/star_border.dart
@@ -80,7 +80,7 @@
                       color: Colors.blue.shade100,
                       shape: lerpBorder(
                         StarBorder.polygon(
-                          side: const BorderSide(strokeAlign: BorderSide.strokeAlignCenter, width: 2),
+                          side: const BorderSide(strokeAlign: StrokeAlign.center, width: 2),
                           sides: _model.points,
                           pointRounding: _model.pointRounding,
                           rotation: _model.rotation,
@@ -102,7 +102,7 @@
                       color: Colors.blue.shade100,
                       shape: lerpBorder(
                         StarBorder(
-                          side: const BorderSide(strokeAlign: BorderSide.strokeAlignCenter, width: 2),
+                          side: const BorderSide(strokeAlign: StrokeAlign.center, width: 2),
                           points: _model.points,
                           innerRadiusRatio: _model.innerRadiusRatio,
                           pointRounding: _model.pointRounding,
diff --git a/examples/api/lib/painting/borders/border_side.0.dart b/examples/api/lib/painting/borders/border_side.0.dart
deleted file mode 100644
index 95a33e2..0000000
--- a/examples/api/lib/painting/borders/border_side.0.dart
+++ /dev/null
@@ -1,204 +0,0 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/// Flutter code sample for [BorderSide].
-
-import 'package:flutter/material.dart';
-
-void main() => runApp(const BorderSideApp());
-
-class BorderSideApp extends StatelessWidget {
-  const BorderSideApp({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return const MaterialApp(home: BorderSideExample());
-  }
-}
-
-class BorderSideExample extends StatefulWidget {
-  const BorderSideExample({super.key});
-
-  @override
-  State<BorderSideExample> createState() => _BorderSideExampleState();
-}
-
-class _BorderSideExampleState extends State<BorderSideExample>
-    with TickerProviderStateMixin {
-  late final AnimationController animation;
-
-  @override
-  void initState() {
-    super.initState();
-    animation =
-        AnimationController(vsync: this, duration: const Duration(seconds: 1));
-    animation.repeat(reverse: true);
-    animation.addListener(_markDirty);
-  }
-
-  @override
-  void dispose() {
-    animation.dispose();
-    super.dispose();
-  }
-
-  void _markDirty() {
-    setState(() {});
-  }
-
-  static const double borderWidth = 10;
-  static const double cornerRadius = 10;
-  static const Color borderColor = Color(0x8000b4fc);
-
-  @override
-  Widget build(BuildContext context) {
-    return Material(
-      child: Center(
-        child: Column(
-          mainAxisAlignment: MainAxisAlignment.spaceAround,
-          children: <Widget>[
-            TestBox(
-              shape: StadiumBorder(
-                side: BorderSide(
-                  color: borderColor,
-                  width: borderWidth,
-                  strokeAlign: (animation.value * 2) - 1,
-                ),
-              ),
-            ),
-            Row(
-              mainAxisAlignment: MainAxisAlignment.spaceAround,
-              children: <Widget>[
-                TestBox(
-                  shape: CircleBorder(
-                    side: BorderSide(
-                      color: borderColor,
-                      width: borderWidth,
-                      strokeAlign: (animation.value * 2) - 1,
-                    ),
-                  ),
-                ),
-                TestBox(
-                  shape: OvalBorder(
-                    side: BorderSide(
-                      color: borderColor,
-                      width: borderWidth,
-                      strokeAlign: (animation.value * 2) - 1,
-                    ),
-                  ),
-                ),
-              ],
-            ),
-            Row(
-              mainAxisAlignment: MainAxisAlignment.spaceAround,
-              children: <Widget>[
-                TestBox(
-                  shape: BeveledRectangleBorder(
-                    side: BorderSide(
-                      color: borderColor,
-                      width: borderWidth,
-                      strokeAlign: (animation.value * 2) - 1,
-                    ),
-                  ),
-                ),
-                TestBox(
-                  shape: BeveledRectangleBorder(
-                    borderRadius: BorderRadius.circular(cornerRadius),
-                    side: BorderSide(
-                      color: borderColor,
-                      width: borderWidth,
-                      strokeAlign: (animation.value * 2) - 1,
-                    ),
-                  ),
-                ),
-              ],
-            ),
-            Row(
-              mainAxisAlignment: MainAxisAlignment.spaceAround,
-              children: <Widget>[
-                TestBox(
-                  shape: RoundedRectangleBorder(
-                    side: BorderSide(
-                      color: borderColor,
-                      width: borderWidth,
-                      strokeAlign: (animation.value * 2) - 1,
-                    ),
-                  ),
-                ),
-                TestBox(
-                  shape: RoundedRectangleBorder(
-                    borderRadius: BorderRadius.circular(cornerRadius),
-                    side: BorderSide(
-                      color: borderColor,
-                      width: borderWidth,
-                      strokeAlign: (animation.value * 2) - 1,
-                    ),
-                  ),
-                ),
-              ],
-            ),
-            Row(
-              mainAxisAlignment: MainAxisAlignment.spaceAround,
-              children: <Widget>[
-                TestBox(
-                  shape: StarBorder(
-                    side: BorderSide(
-                      color: borderColor,
-                      width: borderWidth,
-                      strokeAlign: (animation.value * 2) - 1,
-                    ),
-                  ),
-                ),
-                TestBox(
-                  shape: StarBorder(
-                    pointRounding: 1,
-                    innerRadiusRatio: 0.5,
-                    points: 8,
-                    side: BorderSide(
-                      color: borderColor,
-                      width: borderWidth,
-                      strokeAlign: (animation.value * 2) - 1,
-                    ),
-                  ),
-                ),
-                TestBox(
-                  shape: StarBorder.polygon(
-                    sides: 6,
-                    pointRounding: 0.5,
-                    side: BorderSide(
-                      color: borderColor,
-                      width: borderWidth,
-                      strokeAlign: (animation.value * 2) - 1,
-                    ),
-                  ),
-                ),
-              ],
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
-class TestBox extends StatelessWidget {
-  const TestBox({
-    super.key,
-    required this.shape,
-  });
-
-  final ShapeBorder shape;
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      width: 100,
-      height: 50,
-      decoration: ShapeDecoration(
-        color: const Color(0xff012677),
-        shape: shape,
-      ),
-    );
-  }
-}
diff --git a/examples/api/test/painting/border_side.0_test.dart b/examples/api/test/painting/border_side.0_test.dart
deleted file mode 100644
index 379641a..0000000
--- a/examples/api/test/painting/border_side.0_test.dart
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'package:flutter/material.dart';
-import 'package:flutter_api_samples/painting/borders/border_side.0.dart'
-    as example;
-import 'package:flutter_test/flutter_test.dart';
-
-void main() {
-  testWidgets('Finds the expected TestBox', (WidgetTester tester) async {
-    await tester.pumpWidget(
-      const MaterialApp(
-        home: example.BorderSideExample(),
-      ),
-    );
-
-    expect(find.byType(example.BorderSideExample), findsOneWidget);
-    expect(find.byType(example.TestBox), findsNWidgets(10));
-  });
-}
diff --git a/packages/flutter/lib/src/painting/beveled_rectangle_border.dart b/packages/flutter/lib/src/painting/beveled_rectangle_border.dart
index c058013..8e7406c 100644
--- a/packages/flutter/lib/src/painting/beveled_rectangle_border.dart
+++ b/packages/flutter/lib/src/painting/beveled_rectangle_border.dart
@@ -9,6 +9,7 @@
 import 'basic_types.dart';
 import 'border_radius.dart';
 import 'borders.dart';
+import 'edge_insets.dart';
 
 /// A rectangular border with flattened or "beveled" corners.
 ///
@@ -40,6 +41,18 @@
   final BorderRadiusGeometry borderRadius;
 
   @override
+  EdgeInsetsGeometry get dimensions {
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        return EdgeInsets.all(side.width);
+      case StrokeAlign.center:
+        return EdgeInsets.all(side.width / 2);
+      case StrokeAlign.outside:
+        return EdgeInsets.zero;
+    }
+  }
+
+  @override
   ShapeBorder scale(double t) {
     return BeveledRectangleBorder(
       side: side.scale(t),
@@ -112,7 +125,21 @@
 
   @override
   Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
-    return _getPath(borderRadius.resolve(textDirection).toRRect(rect).deflate(side.strokeInset));
+    final RRect borderRect = borderRadius.resolve(textDirection).toRRect(rect);
+    final RRect adjustedRect;
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        adjustedRect = borderRect.deflate(side.width);
+        break;
+      case StrokeAlign.center:
+        adjustedRect = borderRect.deflate(side.width / 2);
+        break;
+      case StrokeAlign.outside:
+        adjustedRect = borderRect;
+        break;
+    }
+
+    return _getPath(adjustedRect);
   }
 
   @override
@@ -129,7 +156,21 @@
       case BorderStyle.none:
         break;
       case BorderStyle.solid:
-        final Path path = _getPath(borderRadius.resolve(textDirection).toRRect(rect).inflate(side.strokeOffset / 2));
+        final RRect borderRect = borderRadius.resolve(textDirection).toRRect(rect);
+        final RRect adjustedRect;
+        switch (side.strokeAlign) {
+          case StrokeAlign.inside:
+            adjustedRect = borderRect;
+            break;
+          case StrokeAlign.center:
+            adjustedRect = borderRect.inflate(side.width / 2);
+            break;
+          case StrokeAlign.outside:
+            adjustedRect = borderRect.inflate(side.width);
+            break;
+        }
+        final Path path = _getPath(adjustedRect)
+          ..addPath(getInnerPath(rect, textDirection: textDirection), Offset.zero);
         canvas.drawPath(path, side.toPaint());
         break;
     }
diff --git a/packages/flutter/lib/src/painting/borders.dart b/packages/flutter/lib/src/painting/borders.dart
index fe3b57f..9d8666d 100644
--- a/packages/flutter/lib/src/painting/borders.dart
+++ b/packages/flutter/lib/src/painting/borders.dart
@@ -21,6 +21,27 @@
   // if you add more, think about how they will lerp
 }
 
+/// The relative position of the stroke on a [BorderSide] in a [Border] or [OutlinedBorder].
+/// When set to [inside], the stroke is drawn completely inside the widget.
+/// For [center] and [outside], a property such as [Container.clipBehavior]
+/// can be used in an outside widget to clip it.
+/// If [Container.decoration] has a border, the container may incorporate
+/// [BorderSide.width] as additional padding:
+/// - [inside] provides padding with full [BorderSide.width].
+/// - [center] provides padding with half [BorderSide.width].
+/// - [outside] provides zero padding, as stroke is drawn entirely outside.
+enum StrokeAlign {
+  /// The border is drawn on the inside of the border path.
+  inside,
+
+  /// The border is drawn on the center of the border path, with half of the
+  /// [BorderSide.width] on the inside, and the other half on the outside of the path.
+  center,
+
+  /// The border is drawn on the outside of the border path.
+  outside,
+}
+
 /// A side of a border of a box.
 ///
 /// A [Border] consists of four [BorderSide] objects: [Border.top],
@@ -58,7 +79,7 @@
 ///    ([TableBorder.horizontalInside] and [TableBorder.verticalInside]), both
 ///    of which are also [BorderSide] objects.
 @immutable
-class BorderSide with Diagnosticable {
+class BorderSide {
   /// Creates the side of a border.
   ///
   /// By default, the border is 1.0 logical pixels wide and solid black.
@@ -66,12 +87,11 @@
     this.color = const Color(0xFF000000),
     this.width = 1.0,
     this.style = BorderStyle.solid,
-    this.strokeAlign = strokeAlignInside,
+    this.strokeAlign = StrokeAlign.inside,
   }) : assert(color != null),
        assert(width != null),
        assert(width >= 0.0),
-       assert(style != null),
-       assert(strokeAlign != null);
+       assert(style != null);
 
   /// Creates a [BorderSide] that represents the addition of the two given
   /// [BorderSide]s.
@@ -104,7 +124,6 @@
     return BorderSide(
       color: a.color, // == b.color
       width: a.width + b.width,
-      strokeAlign: math.max(a.strokeAlign, b.strokeAlign),
       style: a.style, // == b.style
     );
   }
@@ -132,50 +151,20 @@
   /// A hairline black border that is not rendered.
   static const BorderSide none = BorderSide(width: 0.0, style: BorderStyle.none);
 
-  /// The relative position of the stroke on a [BorderSide] in an
-  /// [OutlinedBorder] or [Border].
-  ///
-  /// Values typically range from -1.0 ([strokeAlignInside], inside border,
-  /// default) to 1.0 ([strokeAlignOutside], outside border), without any
-  /// bound constraints (e.g., a value of -2.0 is is not typical, but allowed).
-  /// A value of 0 ([strokeAlignCenter]) will center the border on the edge
-  /// of the widget.
-  ///
-  /// When set to [strokeAlignInside], the stroke is drawn completely inside
-  /// the widget. For [strokeAlignCenter] and [strokeAlignOutside], a property
-  /// such as [Container.clipBehavior] can be used in an outside widget to clip
-  /// it. If [Container.decoration] has a border, the container may incorporate
-  /// [width] as additional padding:
-  /// - [strokeAlignInside] provides padding with full [width].
-  /// - [strokeAlignCenter] provides padding with half [width].
-  /// - [strokeAlignOutside] provides zero padding, as stroke is drawn entirely outside.
-  final double strokeAlign;
-
-  /// The border is drawn fully inside of the border path.
-  ///
-  /// This is the default.
-  static const double strokeAlignInside = -1.0;
-
-  /// The border is drawn on the center of the border path, with half of the
-  /// [BorderSide.width] on the inside, and the other half on the outside of
-  /// the path.
-  static const double strokeAlignCenter = 0.0;
-
-  /// The border is drawn on the outside of the border path.
-  static const double strokeAlignOutside = 1.0;
+  /// The direction of where the border will be drawn relative to the container.
+  final StrokeAlign strokeAlign;
 
   /// Creates a copy of this border but with the given fields replaced with the new values.
   BorderSide copyWith({
     Color? color,
     double? width,
     BorderStyle? style,
-    double? strokeAlign,
   }) {
+    assert(width == null || width >= 0.0);
     return BorderSide(
       color: color ?? this.color,
       width: width ?? this.width,
       style: style ?? this.style,
-      strokeAlign: strokeAlign ?? this.strokeAlign,
     );
   }
 
@@ -240,7 +229,8 @@
       return true;
     }
     return a.style == b.style
-        && a.color == b.color;
+        && a.color == b.color
+        && a.strokeAlign == b.strokeAlign;
   }
 
   /// Linearly interpolate between two border sides.
@@ -288,10 +278,13 @@
         break;
     }
     if (a.strokeAlign != b.strokeAlign) {
+      // When strokeAlign changes, lerp to 0, then from 0 to the target width.
+      // All StrokeAlign values share a common zero width state.
+      final StrokeAlign strokeAlign = t > 0.5 ? b.strokeAlign : a.strokeAlign;
       return BorderSide(
         color: Color.lerp(colorA, colorB, t)!,
-        width: width,
-        strokeAlign: ui.lerpDouble(a.strokeAlign, b.strokeAlign, t)!,
+        width: t > 0.5 ? ui.lerpDouble(0, b.width, t * 2 - 1)! : ui.lerpDouble(a.width, 0, t * 2)!,
+        strokeAlign: strokeAlign,
       );
     }
     return BorderSide(
@@ -301,26 +294,6 @@
     );
   }
 
-  /// Get the amount of the stroke width that lies inside of the [BorderSide].
-  ///
-  /// For example, this will return the [width] for a [strokeAlign] of -1, half
-  /// the [width] for a [strokeAlign] of 0, and 0 for a [strokeAlign] of 1.
-  double get strokeInset => width * (1 - (1 + strokeAlign) / 2);
-
-  /// Get the amount of the stroke width that lies outside of the [BorderSide].
-  ///
-  /// For example, this will return 0 for a [strokeAlign] of -1, half the
-  /// [width] for a [strokeAlign] of 0, and the [width] for a [strokeAlign]
-  /// of 1.
-  double get strokeOutset => width * (1 + strokeAlign) / 2;
-
-  /// The offset of the stroke, taking into account the stroke alignment.
-  ///
-  /// For example, this will return the negative [width] of the stroke
-  /// for a [strokeAlign] of -1, 0 for a [strokeAlign] of 0, and the
-  /// [width] for a [strokeAlign] of -1.
-  double get strokeOffset => width * strokeAlign;
-
   @override
   bool operator ==(Object other) {
     if (identical(this, other)) {
@@ -340,15 +313,11 @@
   int get hashCode => Object.hash(color, width, style, strokeAlign);
 
   @override
-  String toStringShort() => 'BorderSide';
-
-  @override
-  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
-    super.debugFillProperties(properties);
-    properties.add(DiagnosticsProperty<Color>('color', color, defaultValue: const Color(0xFF000000)));
-    properties.add(DoubleProperty('width', width, defaultValue: 1.0));
-    properties.add(DoubleProperty('strokeAlign', strokeAlign, defaultValue: strokeAlignInside));
-    properties.add(EnumProperty<BorderStyle>('style', style, defaultValue: BorderStyle.solid));
+  String toString() {
+    if (strokeAlign == StrokeAlign.inside) {
+      return '${objectRuntimeType(this, 'BorderSide')}($color, ${width.toStringAsFixed(1)}, $style)';
+    }
+    return '${objectRuntimeType(this, 'BorderSide')}($color, ${width.toStringAsFixed(1)}, $style, $strokeAlign)';
   }
 }
 
@@ -588,9 +557,6 @@
   /// The value of [side] must not be null.
   const OutlinedBorder({ this.side = BorderSide.none }) : assert(side != null);
 
-  @override
-  EdgeInsetsGeometry get dimensions => EdgeInsets.all(math.max(side.strokeInset, 0));
-
   /// The border outline's color and weight.
   ///
   /// If [side] is [BorderSide.none], which is the default, an outline is not drawn.
diff --git a/packages/flutter/lib/src/painting/box_border.dart b/packages/flutter/lib/src/painting/box_border.dart
index e5b88f6..1c6b54b 100644
--- a/packages/flutter/lib/src/painting/box_border.dart
+++ b/packages/flutter/lib/src/painting/box_border.dart
@@ -219,22 +219,62 @@
         ..strokeWidth = 0.0;
       canvas.drawRRect(borderRadius.toRRect(rect), paint);
     } else {
-      final RRect borderRect = borderRadius.toRRect(rect);
-      final RRect inner = borderRect.deflate(side.strokeInset);
-      final RRect outer = borderRect.inflate(side.strokeOutset);
-      canvas.drawDRRect(outer, inner, paint);
+      if (side.strokeAlign == StrokeAlign.inside) {
+        final RRect outer = borderRadius.toRRect(rect);
+        final RRect inner = outer.deflate(width);
+        canvas.drawDRRect(outer, inner, paint);
+      } else {
+        final Rect inner;
+        final Rect outer;
+        if (side.strokeAlign == StrokeAlign.center) {
+          inner = rect.deflate(width / 2);
+          outer = rect.inflate(width / 2);
+        } else {
+          inner = rect;
+          outer = rect.inflate(width);
+        }
+        canvas.drawDRRect(borderRadius.toRRect(outer), borderRadius.toRRect(inner), paint);
+      }
     }
   }
 
   static void _paintUniformBorderWithCircle(Canvas canvas, Rect rect, BorderSide side) {
     assert(side.style != BorderStyle.none);
-    final double radius = (rect.shortestSide + side.strokeOffset) / 2;
-    canvas.drawCircle(rect.center, radius, side.toPaint());
+    final double width = side.width;
+    final Paint paint = side.toPaint();
+    final double radius;
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        radius = (rect.shortestSide - width) / 2.0;
+        break;
+      case StrokeAlign.center:
+        radius = rect.shortestSide / 2.0;
+        break;
+      case StrokeAlign.outside:
+        radius = (rect.shortestSide + width) / 2.0;
+        break;
+    }
+    canvas.drawCircle(rect.center, radius, paint);
   }
 
   static void _paintUniformBorderWithRectangle(Canvas canvas, Rect rect, BorderSide side) {
     assert(side.style != BorderStyle.none);
-    canvas.drawRect(rect.inflate(side.strokeOffset / 2), side.toPaint());
+    final double width = side.width;
+    final Paint paint = side.toPaint();
+    final Rect rectToBeDrawn;
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        rectToBeDrawn = rect.deflate(width / 2.0);
+        break;
+      case StrokeAlign.center:
+        rectToBeDrawn = rect;
+        break;
+      case StrokeAlign.outside:
+        rectToBeDrawn = rect.inflate(width / 2.0);
+        break;
+    }
+
+    canvas.drawRect(rectToBeDrawn, paint);
   }
 }
 
@@ -348,7 +388,7 @@
     Color color = const Color(0xFF000000),
     double width = 1.0,
     BorderStyle style = BorderStyle.solid,
-    double strokeAlign = BorderSide.strokeAlignInside,
+    StrokeAlign strokeAlign = StrokeAlign.inside,
   }) {
     final BorderSide side = BorderSide(color: color, width: width, style: style, strokeAlign: strokeAlign);
     return Border.fromBorderSide(side);
@@ -390,10 +430,17 @@
 
   @override
   EdgeInsetsGeometry get dimensions {
-    if (_widthIsUniform) {
-      return EdgeInsets.all(top.strokeInset);
+    if (isUniform) {
+      switch (top.strokeAlign) {
+        case StrokeAlign.inside:
+          return EdgeInsets.all(top.width);
+        case StrokeAlign.center:
+          return EdgeInsets.all(top.width / 2);
+        case StrokeAlign.outside:
+          return EdgeInsets.zero;
+      }
     }
-    return EdgeInsets.fromLTRB(left.strokeInset, top.strokeInset, right.strokeInset, bottom.strokeInset);
+    return EdgeInsets.fromLTRB(left.width, top.width, right.width, bottom.width);
   }
 
   @override
@@ -415,7 +462,7 @@
   }
 
   bool get _strokeAlignIsUniform {
-    final double topStrokeAlign = top.strokeAlign;
+    final StrokeAlign topStrokeAlign = top.strokeAlign;
     return right.strokeAlign == topStrokeAlign
         && bottom.strokeAlign == topStrokeAlign
         && left.strokeAlign == topStrokeAlign;
@@ -522,7 +569,7 @@
               BoxBorder._paintUniformBorderWithCircle(canvas, rect, top);
               break;
             case BoxShape.rectangle:
-              if (borderRadius != null && borderRadius != BorderRadius.zero) {
+              if (borderRadius != null) {
                 BoxBorder._paintUniformBorderWithRadius(canvas, rect, top, borderRadius);
                 return;
               }
@@ -560,9 +607,9 @@
       return true;
     }());
     assert(() {
-      if (!_strokeAlignIsUniform || top.strokeAlign != BorderSide.strokeAlignInside) {
+      if (!_strokeAlignIsUniform || top.strokeAlign != StrokeAlign.inside) {
         throw FlutterError.fromParts(<DiagnosticsNode>[
-          ErrorSummary('A Border can only draw strokeAlign different than BorderSide.strokeAlignInside on uniform borders.'),
+          ErrorSummary('A Border can only draw strokeAlign different than StrokeAlign.inside on uniform borders.'),
         ]);
       }
       return true;
@@ -694,9 +741,16 @@
   @override
   EdgeInsetsGeometry get dimensions {
     if (isUniform) {
-      return EdgeInsetsDirectional.all(top.strokeInset);
+      switch (top.strokeAlign) {
+        case StrokeAlign.inside:
+          return EdgeInsetsDirectional.all(top.width);
+        case StrokeAlign.center:
+          return EdgeInsetsDirectional.all(top.width / 2);
+        case StrokeAlign.outside:
+          return EdgeInsetsDirectional.zero;
+      }
     }
-    return EdgeInsetsDirectional.fromSTEB(start.strokeInset, top.strokeInset, end.strokeInset, bottom.strokeInset);
+    return EdgeInsetsDirectional.fromSTEB(start.width, top.width, end.width, bottom.width);
   }
 
   @override
@@ -730,7 +784,7 @@
   }
 
   bool get _strokeAlignIsUniform {
-    final double topStrokeAlign = top.strokeAlign;
+    final StrokeAlign topStrokeAlign = top.strokeAlign;
     return start.strokeAlign == topStrokeAlign
         && bottom.strokeAlign == topStrokeAlign
         && end.strokeAlign == topStrokeAlign;
@@ -873,7 +927,7 @@
               BoxBorder._paintUniformBorderWithCircle(canvas, rect, top);
               break;
             case BoxShape.rectangle:
-              if (borderRadius != null && borderRadius != BorderRadius.zero) {
+              if (borderRadius != null) {
                 BoxBorder._paintUniformBorderWithRadius(canvas, rect, top, borderRadius);
                 return;
               }
@@ -886,7 +940,7 @@
 
     assert(borderRadius == null, 'A borderRadius can only be given for uniform borders.');
     assert(shape == BoxShape.rectangle, 'A border can only be drawn as a circle if it is uniform.');
-    assert(_strokeAlignIsUniform && top.strokeAlign == BorderSide.strokeAlignInside, 'A Border can only draw strokeAlign different than strokeAlignInside on uniform borders.');
+    assert(_strokeAlignIsUniform && top.strokeAlign == StrokeAlign.inside, 'A Border can only draw strokeAlign different than StrokeAlign.inside on uniform borders.');
 
     final BorderSide left, right;
     assert(textDirection != null, 'Non-uniform BorderDirectional objects require a TextDirection when painting.');
diff --git a/packages/flutter/lib/src/painting/box_decoration.dart b/packages/flutter/lib/src/painting/box_decoration.dart
index e64204a..01164b4 100644
--- a/packages/flutter/lib/src/painting/box_decoration.dart
+++ b/packages/flutter/lib/src/painting/box_decoration.dart
@@ -431,7 +431,7 @@
         canvas.drawCircle(center, radius, paint);
         break;
       case BoxShape.rectangle:
-        if (_decoration.borderRadius == null || _decoration.borderRadius == BorderRadius.zero) {
+        if (_decoration.borderRadius == null) {
           canvas.drawRect(rect, paint);
         } else {
           canvas.drawRRect(_decoration.borderRadius!.resolve(textDirection).toRRect(rect), paint);
diff --git a/packages/flutter/lib/src/painting/circle_border.dart b/packages/flutter/lib/src/painting/circle_border.dart
index 342f6de..24b2251 100644
--- a/packages/flutter/lib/src/painting/circle_border.dart
+++ b/packages/flutter/lib/src/painting/circle_border.dart
@@ -8,6 +8,7 @@
 
 import 'basic_types.dart';
 import 'borders.dart';
+import 'edge_insets.dart';
 
 /// A border that fits a circle within the available space.
 ///
@@ -45,6 +46,18 @@
   final double eccentricity;
 
   @override
+  EdgeInsetsGeometry get dimensions {
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        return EdgeInsets.all(side.width);
+      case StrokeAlign.center:
+        return EdgeInsets.all(side.width / 2);
+      case StrokeAlign.outside:
+        return EdgeInsets.zero;
+    }
+  }
+
+  @override
   ShapeBorder scale(double t) => CircleBorder(side: side.scale(t), eccentricity: eccentricity);
 
   @override
@@ -71,12 +84,25 @@
 
   @override
   Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
-    return Path()..addOval(_adjustRect(rect).deflate(side.strokeInset));
+    final double delta;
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        delta = side.width;
+        break;
+      case StrokeAlign.center:
+        delta = side.width / 2.0;
+        break;
+      case StrokeAlign.outside:
+        delta = 0;
+        break;
+    }
+    final Rect adjustedRect = _adjustRect(rect).deflate(delta);
+    return Path()..addOval(adjustedRect);
   }
 
   @override
   Path getOuterPath(Rect rect, { TextDirection? textDirection }) {
-    return Path()..addOval(_adjustRect(rect));
+      return Path()..addOval(_adjustRect(rect));
   }
 
   @override
@@ -90,11 +116,35 @@
       case BorderStyle.none:
         break;
       case BorderStyle.solid:
-        if (eccentricity == 0.0) {
-          canvas.drawCircle(rect.center, (rect.shortestSide + side.strokeOffset) / 2, side.toPaint());
-        } else {
+        if (eccentricity != 0.0) {
           final Rect borderRect = _adjustRect(rect);
-          canvas.drawOval(borderRect.inflate(side.strokeOffset / 2), side.toPaint());
+          final Rect adjustedRect;
+          switch (side.strokeAlign) {
+            case StrokeAlign.inside:
+              adjustedRect = borderRect.deflate(side.width / 2.0);
+              break;
+            case StrokeAlign.center:
+              adjustedRect = borderRect;
+              break;
+            case StrokeAlign.outside:
+              adjustedRect = borderRect.inflate(side.width / 2.0);
+              break;
+          }
+          canvas.drawOval(adjustedRect, side.toPaint());
+        } else {
+          final double radius;
+          switch (side.strokeAlign) {
+            case StrokeAlign.inside:
+              radius = (rect.shortestSide - side.width) / 2.0;
+              break;
+            case StrokeAlign.center:
+              radius = rect.shortestSide / 2.0;
+              break;
+            case StrokeAlign.outside:
+              radius = (rect.shortestSide + side.width) / 2.0;
+              break;
+          }
+          canvas.drawCircle(rect.center, radius, side.toPaint());
         }
     }
   }
diff --git a/packages/flutter/lib/src/painting/continuous_rectangle_border.dart b/packages/flutter/lib/src/painting/continuous_rectangle_border.dart
index 0e289b0..b3456c9 100644
--- a/packages/flutter/lib/src/painting/continuous_rectangle_border.dart
+++ b/packages/flutter/lib/src/painting/continuous_rectangle_border.dart
@@ -149,7 +149,7 @@
         break;
       case BorderStyle.solid:
         final Path path = getOuterPath(rect, textDirection: textDirection);
-        final Paint paint = side.toPaint()..strokeJoin = StrokeJoin.round;
+        final Paint paint = side.toPaint();
         canvas.drawPath(path, paint);
         break;
     }
diff --git a/packages/flutter/lib/src/painting/rounded_rectangle_border.dart b/packages/flutter/lib/src/painting/rounded_rectangle_border.dart
index 7ad876d1..98d0428 100644
--- a/packages/flutter/lib/src/painting/rounded_rectangle_border.dart
+++ b/packages/flutter/lib/src/painting/rounded_rectangle_border.dart
@@ -10,6 +10,7 @@
 import 'border_radius.dart';
 import 'borders.dart';
 import 'circle_border.dart';
+import 'edge_insets.dart';
 
 /// A rectangular border with rounded corners.
 ///
@@ -37,6 +38,18 @@
   final BorderRadiusGeometry borderRadius;
 
   @override
+  EdgeInsetsGeometry get dimensions {
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        return EdgeInsets.all(side.width);
+      case StrokeAlign.center:
+        return EdgeInsets.all(side.width / 2);
+      case StrokeAlign.outside:
+        return EdgeInsets.zero;
+    }
+  }
+
+  @override
   ShapeBorder scale(double t) {
     return RoundedRectangleBorder(
       side: side.scale(t),
@@ -97,7 +110,18 @@
   @override
   Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
     final RRect borderRect = borderRadius.resolve(textDirection).toRRect(rect);
-    final RRect adjustedRect = borderRect.deflate(side.strokeInset);
+    final RRect adjustedRect;
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        adjustedRect = borderRect.deflate(side.width);
+        break;
+      case StrokeAlign.center:
+        adjustedRect = borderRect.deflate(side.width / 2);
+        break;
+      case StrokeAlign.outside:
+        adjustedRect = borderRect;
+        break;
+    }
     return Path()
       ..addRRect(adjustedRect);
   }
@@ -114,12 +138,30 @@
       case BorderStyle.none:
         break;
       case BorderStyle.solid:
-        final Paint paint = Paint()
-          ..color = side.color;
-        final RRect borderRect = borderRadius.resolve(textDirection).toRRect(rect);
-        final RRect inner = borderRect.deflate(side.strokeInset);
-        final RRect outer = borderRect.inflate(side.strokeOutset);
-        canvas.drawDRRect(outer, inner, paint);
+        final double width = side.width;
+        if (width == 0.0) {
+          canvas.drawRRect(borderRadius.resolve(textDirection).toRRect(rect), side.toPaint());
+        } else {
+          final Paint paint = Paint()
+            ..color = side.color;
+          if (side.strokeAlign == StrokeAlign.inside) {
+            final RRect outer = borderRadius.resolve(textDirection).toRRect(rect);
+            final RRect inner = outer.deflate(width);
+            canvas.drawDRRect(outer, inner, paint);
+          } else {
+            final Rect inner;
+            final Rect outer;
+            if (side.strokeAlign == StrokeAlign.center) {
+              inner = rect.deflate(width / 2);
+              outer = rect.inflate(width / 2);
+            } else {
+              inner = rect;
+              outer = rect.inflate(width);
+            }
+            final BorderRadius borderRadiusResolved = borderRadius.resolve(textDirection);
+            canvas.drawDRRect(borderRadiusResolved.toRRect(outer), borderRadiusResolved.toRRect(inner), paint);
+        }
+      }
     }
   }
 
@@ -157,6 +199,18 @@
   final double eccentricity;
 
   @override
+  EdgeInsetsGeometry get dimensions {
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        return EdgeInsets.all(side.width);
+      case StrokeAlign.center:
+        return EdgeInsets.all(side.width / 2);
+      case StrokeAlign.outside:
+        return EdgeInsets.zero;
+    }
+  }
+
+  @override
   ShapeBorder scale(double t) {
     return _RoundedRectangleToCircleBorder(
       side: side.scale(t),
@@ -276,7 +330,18 @@
   @override
   Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
     final RRect borderRect = _adjustBorderRadius(rect, textDirection)!.toRRect(_adjustRect(rect));
-    final RRect adjustedRect = borderRect.deflate(ui.lerpDouble(side.width, 0, side.strokeAlign)!);
+    final RRect adjustedRect;
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        adjustedRect = borderRect.deflate(side.width);
+        break;
+      case StrokeAlign.center:
+        adjustedRect = borderRect.deflate(side.width / 2);
+        break;
+      case StrokeAlign.outside:
+        adjustedRect = borderRect;
+        break;
+    }
     return Path()
       ..addRRect(adjustedRect);
   }
@@ -303,9 +368,25 @@
       case BorderStyle.none:
         break;
       case BorderStyle.solid:
-        final BorderRadius adjustedBorderRadius = _adjustBorderRadius(rect, textDirection)!;
-        final RRect borderRect = adjustedBorderRadius.toRRect(_adjustRect(rect));
-        canvas.drawRRect(borderRect.inflate(side.strokeOffset / 2), side.toPaint());
+        final double width = side.width;
+        if (width == 0.0) {
+          canvas.drawRRect(_adjustBorderRadius(rect, textDirection)!.toRRect(_adjustRect(rect)), side.toPaint());
+        } else {
+          final RRect borderRect = _adjustBorderRadius(rect, textDirection)!.toRRect(_adjustRect(rect));
+          final RRect adjustedRect;
+          switch (side.strokeAlign) {
+            case StrokeAlign.inside:
+              adjustedRect = borderRect.deflate(width / 2);
+              break;
+            case StrokeAlign.center:
+              adjustedRect = borderRect;
+              break;
+            case StrokeAlign.outside:
+              adjustedRect = borderRect.inflate(width / 2);
+              break;
+          }
+          canvas.drawRRect(adjustedRect, side.toPaint());
+        }
     }
   }
 
diff --git a/packages/flutter/lib/src/painting/stadium_border.dart b/packages/flutter/lib/src/painting/stadium_border.dart
index 560a2a2..cda9d91 100644
--- a/packages/flutter/lib/src/painting/stadium_border.dart
+++ b/packages/flutter/lib/src/painting/stadium_border.dart
@@ -10,6 +10,7 @@
 import 'border_radius.dart';
 import 'borders.dart';
 import 'circle_border.dart';
+import 'edge_insets.dart';
 import 'rounded_rectangle_border.dart';
 
 /// A border that fits a stadium-shaped border (a box with semicircles on the ends)
@@ -30,6 +31,18 @@
   const StadiumBorder({ super.side }) : assert(side != null);
 
   @override
+  EdgeInsetsGeometry get dimensions {
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        return EdgeInsets.all(side.width);
+      case StrokeAlign.center:
+        return EdgeInsets.all(side.width / 2);
+      case StrokeAlign.outside:
+        return EdgeInsets.zero;
+    }
+  }
+
+  @override
   ShapeBorder scale(double t) => StadiumBorder(side: side.scale(t));
 
   @override
@@ -87,7 +100,18 @@
   Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
     final Radius radius = Radius.circular(rect.shortestSide / 2.0);
     final RRect borderRect = RRect.fromRectAndRadius(rect, radius);
-    final RRect adjustedRect = borderRect.deflate(side.strokeInset);
+    final RRect adjustedRect;
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        adjustedRect = borderRect.deflate(side.width);
+        break;
+      case StrokeAlign.center:
+        adjustedRect = borderRect.deflate(side.width / 2);
+        break;
+      case StrokeAlign.outside:
+        adjustedRect = borderRect;
+        break;
+    }
     return Path()
       ..addRRect(adjustedRect);
   }
@@ -107,7 +131,22 @@
       case BorderStyle.solid:
         final Radius radius = Radius.circular(rect.shortestSide / 2);
         final RRect borderRect = RRect.fromRectAndRadius(rect, radius);
-        canvas.drawRRect(borderRect.inflate(side.strokeOffset / 2), side.toPaint());
+        final RRect adjustedRect;
+        switch (side.strokeAlign) {
+          case StrokeAlign.inside:
+            adjustedRect = borderRect.deflate(side.width / 2);
+            break;
+          case StrokeAlign.center:
+            adjustedRect = borderRect;
+            break;
+          case StrokeAlign.outside:
+            adjustedRect = borderRect.inflate(side.width / 2);
+            break;
+        }
+        canvas.drawRRect(
+          adjustedRect,
+          side.toPaint(),
+        );
     }
   }
 
@@ -142,6 +181,18 @@
   final double eccentricity;
 
   @override
+  EdgeInsetsGeometry get dimensions {
+     switch (side.strokeAlign) {
+       case StrokeAlign.inside:
+         return EdgeInsets.all(side.width);
+       case StrokeAlign.center:
+         return EdgeInsets.all(side.width / 2);
+       case StrokeAlign.outside:
+         return EdgeInsets.zero;
+     }
+  }
+
+  @override
   ShapeBorder scale(double t) {
     return _StadiumToCircleBorder(
       side: side.scale(t),
@@ -252,7 +303,7 @@
   @override
   Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
     return Path()
-      ..addRRect(_adjustBorderRadius(rect).toRRect(_adjustRect(rect)).deflate(side.strokeInset));
+      ..addRRect(_adjustBorderRadius(rect).toRRect(_adjustRect(rect)).deflate(side.width));
   }
 
   @override
@@ -276,8 +327,25 @@
       case BorderStyle.none:
         break;
       case BorderStyle.solid:
-        final RRect borderRect = _adjustBorderRadius(rect).toRRect(_adjustRect(rect));
-        canvas.drawRRect(borderRect.inflate(side.strokeOffset / 2), side.toPaint());
+        final double width = side.width;
+        if (width == 0.0) {
+          canvas.drawRRect(_adjustBorderRadius(rect).toRRect(_adjustRect(rect)), side.toPaint());
+        } else {
+          final RRect borderRect = _adjustBorderRadius(rect).toRRect(_adjustRect(rect));
+          final RRect adjustedRect;
+          switch (side.strokeAlign) {
+            case StrokeAlign.inside:
+              adjustedRect = borderRect.deflate(width / 2);
+              break;
+            case StrokeAlign.center:
+              adjustedRect = borderRect;
+              break;
+            case StrokeAlign.outside:
+              adjustedRect = borderRect.inflate(width / 2);
+              break;
+          }
+          canvas.drawRRect(adjustedRect, side.toPaint());
+        }
     }
   }
 
@@ -318,6 +386,11 @@
   final double rectness;
 
   @override
+  EdgeInsetsGeometry get dimensions {
+    return EdgeInsets.all(side.width);
+  }
+
+  @override
   ShapeBorder scale(double t) {
     return _StadiumToRoundedRectangleBorder(
       side: side.scale(t),
@@ -391,7 +464,18 @@
   @override
   Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
     final RRect borderRect = _adjustBorderRadius(rect).toRRect(rect);
-    final RRect adjustedRect = borderRect.deflate(ui.lerpDouble(side.width, 0, side.strokeAlign)!);
+    final RRect adjustedRect;
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        adjustedRect = borderRect.deflate(side.width);
+        break;
+      case StrokeAlign.center:
+        adjustedRect = borderRect.deflate(side.width / 2);
+        break;
+      case StrokeAlign.outside:
+        adjustedRect = borderRect;
+        break;
+    }
     return Path()
       ..addRRect(adjustedRect);
   }
@@ -417,9 +501,26 @@
       case BorderStyle.none:
         break;
       case BorderStyle.solid:
-        final BorderRadius adjustedBorderRadius = _adjustBorderRadius(rect);
-        final RRect borderRect = adjustedBorderRadius.resolve(textDirection).toRRect(rect);
-        canvas.drawRRect(borderRect.inflate(side.strokeOffset / 2), side.toPaint());
+        final double width = side.width;
+        if (width == 0.0) {
+          canvas.drawRRect(_adjustBorderRadius(rect).toRRect(rect), side.toPaint());
+        } else {
+          if (side.strokeAlign == StrokeAlign.inside) {
+            final RRect outer = _adjustBorderRadius(rect).toRRect(rect);
+            final RRect inner = outer.deflate(width);
+            final Paint paint = Paint()
+              ..color = side.color;
+            canvas.drawDRRect(outer, inner, paint);
+          } else {
+            final RRect outer;
+            if (side.strokeAlign == StrokeAlign.center) {
+              outer = _adjustBorderRadius(rect).toRRect(rect);
+            } else {
+              outer = _adjustBorderRadius(rect.inflate(width)).toRRect(rect.inflate(width / 2));
+            }
+            canvas.drawRRect(outer, side.toPaint());
+          }
+        }
     }
   }
 
diff --git a/packages/flutter/lib/src/painting/star_border.dart b/packages/flutter/lib/src/painting/star_border.dart
index aadd095..7e51a13 100644
--- a/packages/flutter/lib/src/painting/star_border.dart
+++ b/packages/flutter/lib/src/painting/star_border.dart
@@ -11,6 +11,7 @@
 import 'basic_types.dart';
 import 'borders.dart';
 import 'circle_border.dart';
+import 'edge_insets.dart';
 import 'rounded_rectangle_border.dart';
 import 'stadium_border.dart';
 
@@ -166,6 +167,18 @@
   final double squash;
 
   @override
+  EdgeInsetsGeometry get dimensions {
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        return EdgeInsets.all(side.width);
+      case StrokeAlign.center:
+        return EdgeInsets.all(side.width / 2);
+      case StrokeAlign.outside:
+        return EdgeInsets.zero;
+    }
+  }
+
+  @override
   ShapeBorder scale(double t) {
     return StarBorder(
       points: points,
@@ -375,7 +388,18 @@
 
   @override
   Path getInnerPath(Rect rect, {TextDirection? textDirection}) {
-    final Rect adjustedRect = rect.deflate(side.strokeInset);
+    final Rect adjustedRect;
+    switch (side.strokeAlign) {
+      case StrokeAlign.inside:
+        adjustedRect = rect.deflate(side.width);
+        break;
+      case StrokeAlign.center:
+        adjustedRect = rect.deflate(side.width / 2);
+        break;
+      case StrokeAlign.outside:
+        adjustedRect = rect;
+        break;
+    }
     return _StarGenerator(
       points: points,
       rotation: _rotationRadians,
@@ -404,7 +428,18 @@
       case BorderStyle.none:
         break;
       case BorderStyle.solid:
-        final Rect adjustedRect = rect.inflate(side.strokeOffset / 2);
+        final Rect adjustedRect;
+        switch (side.strokeAlign) {
+          case StrokeAlign.inside:
+            adjustedRect = rect.deflate(side.width / 2);
+            break;
+          case StrokeAlign.center:
+            adjustedRect = rect;
+            break;
+          case StrokeAlign.outside:
+            adjustedRect = rect.inflate(side.width / 2);
+            break;
+        }
         final Path path = _StarGenerator(
           points: points,
           rotation: _rotationRadians,
diff --git a/packages/flutter/test/material/bottom_sheet_theme_test.dart b/packages/flutter/test/material/bottom_sheet_theme_test.dart
index d01aad5..51b1cd9 100644
--- a/packages/flutter/test/material/bottom_sheet_theme_test.dart
+++ b/packages/flutter/test/material/bottom_sheet_theme_test.dart
@@ -51,7 +51,7 @@
     expect(description, <String>[
       'backgroundColor: Color(0xffffffff)',
       'elevation: 2.0',
-      'shape: RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(2.0))',
+      'shape: RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(2.0))',
       'clipBehavior: Clip.antiAlias',
       'constraints: BoxConstraints(200.0<=w<=640.0, 0.0<=h<=Infinity)',
     ]);
diff --git a/packages/flutter/test/material/button_style_test.dart b/packages/flutter/test/material/button_style_test.dart
index 44599e5..11de84c 100644
--- a/packages/flutter/test/material/button_style_test.dart
+++ b/packages/flutter/test/material/button_style_test.dart
@@ -88,8 +88,8 @@
       'minimumSize: MaterialStatePropertyAll(Size(1.0, 2.0))',
       'maximumSize: MaterialStatePropertyAll(Size(100.0, 200.0))',
       'iconSize: MaterialStatePropertyAll(48.1)',
-      'side: MaterialStatePropertyAll(BorderSide(color: Color(0xfffffff6), width: 4.0))',
-      'shape: MaterialStatePropertyAll(StadiumBorder(BorderSide(width: 0.0, style: none)))',
+      'side: MaterialStatePropertyAll(BorderSide(Color(0xfffffff6), 4.0, BorderStyle.solid))',
+      'shape: MaterialStatePropertyAll(StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none)))',
       'mouseCursor: MaterialStatePropertyAll(SystemMouseCursor(forbidden))',
       'tapTargetSize: shrinkWrap',
       'animationDuration: 0:00:01.000000',
diff --git a/packages/flutter/test/material/chip_theme_test.dart b/packages/flutter/test/material/chip_theme_test.dart
index c0878ad..80a95c4 100644
--- a/packages/flutter/test/material/chip_theme_test.dart
+++ b/packages/flutter/test/material/chip_theme_test.dart
@@ -119,8 +119,8 @@
       'checkMarkColor: Color(0xfffffff7)',
       'labelPadding: EdgeInsets.all(1.0)',
       'padding: EdgeInsets.all(2.0)',
-      'side: BorderSide(width: 10.0)',
-      'shape: RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.zero)',
+      'side: BorderSide(Color(0xff000000), 10.0, BorderStyle.solid)',
+      'shape: RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.zero)',
       'labelStyle: TextStyle(inherit: true, size: 10.0)',
       'secondaryLabelStyle: TextStyle(inherit: true, size: 20.0)',
       'brightness: dark',
diff --git a/packages/flutter/test/material/drawer_theme_test.dart b/packages/flutter/test/material/drawer_theme_test.dart
index da6b9e8..df79277 100644
--- a/packages/flutter/test/material/drawer_theme_test.dart
+++ b/packages/flutter/test/material/drawer_theme_test.dart
@@ -43,7 +43,7 @@
       'backgroundColor: Color(0x00000099)',
       'scrimColor: Color(0x00000098)',
       'elevation: 5.0',
-      'shape: RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(2.0))',
+      'shape: RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(2.0))',
       'width: 200.0',
     ]);
   });
diff --git a/packages/flutter/test/material/floating_action_button_theme_test.dart b/packages/flutter/test/material/floating_action_button_theme_test.dart
index b30c677..1eca032 100644
--- a/packages/flutter/test/material/floating_action_button_theme_test.dart
+++ b/packages/flutter/test/material/floating_action_button_theme_test.dart
@@ -307,7 +307,7 @@
       'hoverElevation: 10.0',
       'disabledElevation: 11.0',
       'highlightElevation: 43.0',
-      'shape: BeveledRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.zero)',
+      'shape: BeveledRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.zero)',
       'enableFeedback: true',
       'iconSize: 42.0',
       'sizeConstraints: BoxConstraints(w=100.0, h=100.0)',
diff --git a/packages/flutter/test/material/list_tile_test.dart b/packages/flutter/test/material/list_tile_test.dart
index 319e85f..8aaca6f 100644
--- a/packages/flutter/test/material/list_tile_test.dart
+++ b/packages/flutter/test/material/list_tile_test.dart
@@ -2286,7 +2286,7 @@
         'isThreeLine: THREE_LINE',
         'dense: true',
         'visualDensity: VisualDensity#00000(h: 0.0, v: 0.0)',
-        'shape: RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.zero)',
+        'shape: RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.zero)',
         'style: ListTileStyle.list',
         'selectedColor: Color(0xff0000ff)',
         'iconColor: Color(0xff00ff00)',
diff --git a/packages/flutter/test/material/list_tile_theme_test.dart b/packages/flutter/test/material/list_tile_theme_test.dart
index 6b43bb8..bed8707 100644
--- a/packages/flutter/test/material/list_tile_theme_test.dart
+++ b/packages/flutter/test/material/list_tile_theme_test.dart
@@ -111,7 +111,7 @@
       description,
       equalsIgnoringHashCodes(<String>[
         'dense: true',
-        'shape: StadiumBorder(BorderSide(width: 0.0, style: none))',
+        'shape: StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none))',
         'style: drawer',
         'selectedColor: Color(0x00000001)',
         'iconColor: Color(0x00000002)',
diff --git a/packages/flutter/test/material/navigation_bar_theme_test.dart b/packages/flutter/test/material/navigation_bar_theme_test.dart
index 055ba41..bd79843 100644
--- a/packages/flutter/test/material/navigation_bar_theme_test.dart
+++ b/packages/flutter/test/material/navigation_bar_theme_test.dart
@@ -46,7 +46,7 @@
     expect(description[1], 'backgroundColor: Color(0x00000099)');
     expect(description[2], 'elevation: 20.0');
     expect(description[3], 'indicatorColor: Color(0x00000098)');
-    expect(description[4], 'indicatorShape: CircleBorder(BorderSide(width: 0.0, style: none))');
+    expect(description[4], 'indicatorShape: CircleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none))');
     expect(description[5], 'labelTextStyle: MaterialStatePropertyAll(TextStyle(inherit: true, size: 7.0))');
 
     // Ignore instance address for IconThemeData.
diff --git a/packages/flutter/test/material/popup_menu_theme_test.dart b/packages/flutter/test/material/popup_menu_theme_test.dart
index a37e883..768c5b6 100644
--- a/packages/flutter/test/material/popup_menu_theme_test.dart
+++ b/packages/flutter/test/material/popup_menu_theme_test.dart
@@ -60,7 +60,7 @@
 
     expect(description, <String>[
       'color: Color(0xffffffff)',
-      'shape: RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(2.0))',
+      'shape: RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(2.0))',
       'elevation: 2.0',
       'text style: TextStyle(inherit: true, color: Color(0xffffffff))',
       'mouseCursor: MaterialStateMouseCursor(clickable)',
diff --git a/packages/flutter/test/material/snack_bar_theme_test.dart b/packages/flutter/test/material/snack_bar_theme_test.dart
index 5477413..cd82a63 100644
--- a/packages/flutter/test/material/snack_bar_theme_test.dart
+++ b/packages/flutter/test/material/snack_bar_theme_test.dart
@@ -58,7 +58,7 @@
       'disabledActionTextColor: Color(0xff00aa00)',
       'contentTextStyle: TextStyle(inherit: true, color: Color(0xff123456))',
       'elevation: 2.0',
-      'shape: RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(2.0))',
+      'shape: RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(2.0))',
       'behavior: SnackBarBehavior.floating',
     ]);
   });
diff --git a/packages/flutter/test/material/time_picker_theme_test.dart b/packages/flutter/test/material/time_picker_theme_test.dart
index 1e44ae3..021674b 100644
--- a/packages/flutter/test/material/time_picker_theme_test.dart
+++ b/packages/flutter/test/material/time_picker_theme_test.dart
@@ -86,10 +86,10 @@
       'hourMinuteTextStyle: TextStyle(<all styles inherited>)',
       'dayPeriodTextStyle: TextStyle(<all styles inherited>)',
       'helpTextStyle: TextStyle(<all styles inherited>)',
-      'shape: RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.zero)',
-      'hourMinuteShape: RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.zero)',
-      'dayPeriodShape: RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.zero)',
-      'dayPeriodBorderSide: BorderSide',
+      'shape: RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.zero)',
+      'hourMinuteShape: RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.zero)',
+      'dayPeriodShape: RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.zero)',
+      'dayPeriodBorderSide: BorderSide(Color(0xff000000), 1.0, BorderStyle.solid)',
     ]);
   });
 
diff --git a/packages/flutter/test/painting/beveled_rectangle_border_test.dart b/packages/flutter/test/painting/beveled_rectangle_border_test.dart
index c3d4330..14f4dd9 100644
--- a/packages/flutter/test/painting/beveled_rectangle_border_test.dart
+++ b/packages/flutter/test/painting/beveled_rectangle_border_test.dart
@@ -110,8 +110,8 @@
   test('BeveledRectangleBorder with StrokeAlign', () {
     const BorderRadius borderRadius = BorderRadius.all(Radius.circular(10));
     const BeveledRectangleBorder inside = BeveledRectangleBorder(side: BorderSide(width: 10.0), borderRadius: borderRadius);
-    const BeveledRectangleBorder center = BeveledRectangleBorder(side: BorderSide(width: 10.0, strokeAlign: BorderSide.strokeAlignCenter), borderRadius: borderRadius);
-    const BeveledRectangleBorder outside = BeveledRectangleBorder(side: BorderSide(width: 10.0, strokeAlign: BorderSide.strokeAlignOutside), borderRadius: borderRadius);
+    const BeveledRectangleBorder center = BeveledRectangleBorder(side: BorderSide(width: 10.0, strokeAlign: StrokeAlign.center), borderRadius: borderRadius);
+    const BeveledRectangleBorder outside = BeveledRectangleBorder(side: BorderSide(width: 10.0, strokeAlign: StrokeAlign.outside), borderRadius: borderRadius);
     expect(inside.dimensions, const EdgeInsets.all(10.0));
     expect(center.dimensions, const EdgeInsets.all(5.0));
     expect(outside.dimensions, EdgeInsets.zero);
diff --git a/packages/flutter/test/painting/border_rtl_test.dart b/packages/flutter/test/painting/border_rtl_test.dart
index 47b4f1d..18946a7 100644
--- a/packages/flutter/test/painting/border_rtl_test.dart
+++ b/packages/flutter/test/painting/border_rtl_test.dart
@@ -142,7 +142,8 @@
       '   BoxBorder.lerp() was called with two objects of type SillyBorder\n'
       '   and Border:\n'
       '     SillyBorder()\n'
-      '     Border.all(BorderSide(width: 0.0, style: none))\n'
+      '     Border.all(BorderSide(Color(0xff000000), 0.0,\n'
+      '   BorderStyle.none))\n'
       '   However, only Border and BorderDirectional classes are supported\n'
       '   by this method.\n'
       '   For a more general interpolation method, consider using\n'
diff --git a/packages/flutter/test/painting/border_side_test.dart b/packages/flutter/test/painting/border_side_test.dart
index b4c33c1..35f5023 100644
--- a/packages/flutter/test/painting/border_side_test.dart
+++ b/packages/flutter/test/painting/border_side_test.dart
@@ -119,21 +119,21 @@
   test('BorderSide - toString', () {
     expect(
       const BorderSide(color: Color(0xFFAABBCC), width: 1.2345).toString(),
-      'BorderSide(color: Color(0xffaabbcc), width: 1.2)',
+      'BorderSide(Color(0xffaabbcc), 1.2, BorderStyle.solid)',
     );
   });
 
   test('BorderSide - lerp with strokeAlign', () {
-    const BorderSide side0 = BorderSide(width: 2.0);
-    const BorderSide side1 = BorderSide(width: 2.0, strokeAlign: BorderSide.strokeAlignOutside);
-    expect(BorderSide.lerp(side0, side1, 0), const BorderSide(width: 2.0));
-    expect(BorderSide.lerp(side0, side1, 0.5), const BorderSide(width: 2.0, strokeAlign: BorderSide.strokeAlignCenter));
-    expect(BorderSide.lerp(side0, side1, 1), const BorderSide(width: 2.0, strokeAlign: BorderSide.strokeAlignOutside));
+    const BorderSide side0 = BorderSide(width: 2.0, strokeAlign: StrokeAlign.center);
+    const BorderSide side1 = BorderSide(width: 2.0, strokeAlign: StrokeAlign.outside);
+    expect(BorderSide.lerp(side0, side1, 0), const BorderSide(width: 2.0, strokeAlign: StrokeAlign.center));
+    expect(BorderSide.lerp(side0, side1, 0.5), const BorderSide(width: 0.0, strokeAlign: StrokeAlign.center));
+    expect(BorderSide.lerp(side0, side1, 1), const BorderSide(width: 2.0, strokeAlign: StrokeAlign.outside));
 
     const BorderSide side2 = BorderSide(width: 2.0);
-    const BorderSide side3 = BorderSide(width: 2.0, strokeAlign: BorderSide.strokeAlignCenter);
+    const BorderSide side3 = BorderSide(width: 2.0, strokeAlign: StrokeAlign.center);
     expect(BorderSide.lerp(side2, side3, 0), const BorderSide(width: 2.0));
-    expect(BorderSide.lerp(side2, side3, 0.5), const BorderSide(width: 2.0, strokeAlign: -0.5));
-    expect(BorderSide.lerp(side2, side3, 1), const BorderSide(width: 2.0, strokeAlign: BorderSide.strokeAlignCenter));
+    expect(BorderSide.lerp(side2, side3, 0.5), const BorderSide(width: 0.0));
+    expect(BorderSide.lerp(side2, side3, 1), const BorderSide(width: 2.0, strokeAlign: StrokeAlign.center));
   });
 }
diff --git a/packages/flutter/test/painting/border_test.dart b/packages/flutter/test/painting/border_test.dart
index 2e05515..fa2fd47 100644
--- a/packages/flutter/test/painting/border_test.dart
+++ b/packages/flutter/test/painting/border_test.dart
@@ -202,8 +202,8 @@
     expect(
       const Border(
         left: BorderSide(),
-        top: BorderSide(strokeAlign: BorderSide.strokeAlignCenter),
-        right: BorderSide(strokeAlign: BorderSide.strokeAlignOutside),
+        top: BorderSide(strokeAlign: StrokeAlign.center),
+        right: BorderSide(strokeAlign: StrokeAlign.outside),
       ).isUniform,
       false,
     );
@@ -262,10 +262,10 @@
     try {
       final TestCanvas canvas = TestCanvas();
       // Border.all supports all StrokeAlign values.
-      // Border() supports [BorderSide.strokeAlignInside] only.
+      // Border() supports StrokeAlign.inside only.
       const Border(
-        left: BorderSide(strokeAlign: BorderSide.strokeAlignCenter),
-        right: BorderSide(strokeAlign: BorderSide.strokeAlignOutside),
+        left: BorderSide(strokeAlign: StrokeAlign.center),
+        right: BorderSide(strokeAlign: StrokeAlign.outside),
       ).paint(canvas, const Rect.fromLTWH(10.0, 20.0, 30.0, 40.0));
     } on FlutterError catch (e) {
       error = e;
@@ -274,7 +274,7 @@
     expect(error.diagnostics.length, 1);
     expect(
       error.diagnostics[0].toStringDeep(),
-      'A Border can only draw strokeAlign different than\nBorderSide.strokeAlignInside on uniform borders.\n',
+      'A Border can only draw strokeAlign different than\nStrokeAlign.inside on uniform borders.\n',
     );
   });
 
@@ -282,21 +282,21 @@
     final Border insideBorder = Border.all(width: 10);
     expect(insideBorder.dimensions, const EdgeInsets.all(10));
 
-    final Border centerBorder = Border.all(width: 10, strokeAlign: BorderSide.strokeAlignCenter);
+    final Border centerBorder = Border.all(width: 10, strokeAlign: StrokeAlign.center);
     expect(centerBorder.dimensions, const EdgeInsets.all(5));
 
-    final Border outsideBorder = Border.all(width: 10, strokeAlign: BorderSide.strokeAlignOutside);
+    final Border outsideBorder = Border.all(width: 10, strokeAlign: StrokeAlign.outside);
     expect(outsideBorder.dimensions, EdgeInsets.zero);
 
     const BorderSide insideSide = BorderSide(width: 10);
     const BorderDirectional insideBorderDirectional = BorderDirectional(top: insideSide, bottom: insideSide, start: insideSide, end: insideSide);
     expect(insideBorderDirectional.dimensions, const EdgeInsetsDirectional.all(10));
 
-    const BorderSide centerSide = BorderSide(width: 10, strokeAlign: BorderSide.strokeAlignCenter);
+    const BorderSide centerSide = BorderSide(width: 10, strokeAlign: StrokeAlign.center);
     const BorderDirectional centerBorderDirectional = BorderDirectional(top: centerSide, bottom: centerSide, start: centerSide, end: centerSide);
     expect(centerBorderDirectional.dimensions, const EdgeInsetsDirectional.all(5));
 
-    const BorderSide outsideSide = BorderSide(width: 10, strokeAlign: BorderSide.strokeAlignOutside);
+    const BorderSide outsideSide = BorderSide(width: 10, strokeAlign: StrokeAlign.outside);
     const BorderDirectional outsideBorderDirectional = BorderDirectional(top: outsideSide, bottom: outsideSide, start: outsideSide, end: outsideSide);
     expect(outsideBorderDirectional.dimensions, EdgeInsetsDirectional.zero);
   });
diff --git a/packages/flutter/test/painting/box_painter_test.dart b/packages/flutter/test/painting/box_painter_test.dart
index 85fec3f..7271cbc 100644
--- a/packages/flutter/test/painting/box_painter_test.dart
+++ b/packages/flutter/test/painting/box_painter_test.dart
@@ -54,8 +54,8 @@
       style: BorderStyle.solid,
     );
 
-    expect(side1.toString(), equals('BorderSide'));
-    expect(side2.toString(), equals('BorderSide(color: Color(0xff00ffff), width: 2.0)'));
+    expect(side1.toString(), equals('BorderSide(Color(0xff000000), 1.0, BorderStyle.solid)'));
+    expect(side2.toString(), equals('BorderSide(Color(0xff00ffff), 2.0, BorderStyle.solid)'));
   });
 
   test('Border control test', () {
@@ -76,7 +76,9 @@
   test('Border toString test', () {
     expect(
       Border.all(width: 4.0).toString(),
-      equals('Border.all(BorderSide(width: 4.0))'),
+      equals(
+        'Border.all(BorderSide(Color(0xff000000), 4.0, BorderStyle.solid))',
+      ),
     );
     expect(
       const Border(
@@ -85,7 +87,9 @@
         bottom: BorderSide(width: 3.0),
         left: BorderSide(width: 3.0),
       ).toString(),
-      equals('Border.all(BorderSide(width: 3.0))'),
+      equals(
+        'Border.all(BorderSide(Color(0xff000000), 3.0, BorderStyle.solid))',
+      ),
     );
   });
 
diff --git a/packages/flutter/test/painting/rounded_rectangle_border_test.dart b/packages/flutter/test/painting/rounded_rectangle_border_test.dart
index 94acd9c..aa9c6c8 100644
--- a/packages/flutter/test/painting/rounded_rectangle_border_test.dart
+++ b/packages/flutter/test/painting/rounded_rectangle_border_test.dart
@@ -97,28 +97,28 @@
 
     expect(
       ShapeBorder.lerp(r, c, 0.1).toString(),
-      'RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(10.0), 10.0% of the way to being a CircleBorder)',
+      'RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(10.0), 10.0% of the way to being a CircleBorder)',
     );
     expect(
       ShapeBorder.lerp(r, c, 0.2).toString(),
-      'RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(10.0), 20.0% of the way to being a CircleBorder)',
+      'RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(10.0), 20.0% of the way to being a CircleBorder)',
     );
     expect(
       ShapeBorder.lerp(ShapeBorder.lerp(r, c, 0.1), ShapeBorder.lerp(r, c, 0.9), 0.9).toString(),
-      'RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(10.0), 82.0% of the way to being a CircleBorder)',
+      'RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(10.0), 82.0% of the way to being a CircleBorder)',
     );
 
     expect(
       ShapeBorder.lerp(c, r, 0.9).toString(),
-      'RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(10.0), 10.0% of the way to being a CircleBorder)',
+      'RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(10.0), 10.0% of the way to being a CircleBorder)',
     );
     expect(
       ShapeBorder.lerp(c, r, 0.8).toString(),
-      'RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(10.0), 20.0% of the way to being a CircleBorder)',
+      'RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(10.0), 20.0% of the way to being a CircleBorder)',
     );
     expect(
       ShapeBorder.lerp(ShapeBorder.lerp(r, c, 0.9), ShapeBorder.lerp(r, c, 0.1), 0.1).toString(),
-      'RoundedRectangleBorder(BorderSide(width: 0.0, style: none), BorderRadius.circular(10.0), 82.0% of the way to being a CircleBorder)',
+      'RoundedRectangleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), BorderRadius.circular(10.0), 82.0% of the way to being a CircleBorder)',
     );
 
     expect(ShapeBorder.lerp(r, c, 0.1), ShapeBorder.lerp(r, c, 0.1));
@@ -135,26 +135,19 @@
     const RoundedRectangleBorder insideRoundedRectangleBorder = RoundedRectangleBorder(side: BorderSide(width: 10));
     expect(insideRoundedRectangleBorder.dimensions, const EdgeInsets.all(10));
 
-    const RoundedRectangleBorder centerRoundedRectangleBorder = RoundedRectangleBorder(side: BorderSide(width: 10, strokeAlign: BorderSide.strokeAlignCenter));
+    const RoundedRectangleBorder centerRoundedRectangleBorder = RoundedRectangleBorder(side: BorderSide(width: 10, strokeAlign: StrokeAlign.center));
     expect(centerRoundedRectangleBorder.dimensions, const EdgeInsets.all(5));
 
-    const RoundedRectangleBorder outsideRoundedRectangleBorder = RoundedRectangleBorder(side: BorderSide(width: 10, strokeAlign: BorderSide.strokeAlignOutside));
+    const RoundedRectangleBorder outsideRoundedRectangleBorder = RoundedRectangleBorder(side: BorderSide(width: 10, strokeAlign: StrokeAlign.outside));
     expect(outsideRoundedRectangleBorder.dimensions, EdgeInsets.zero);
 
     const CircleBorder insideCircleBorder = CircleBorder(side: BorderSide(width: 10));
     expect(insideCircleBorder.dimensions, const EdgeInsets.all(10));
 
-    const CircleBorder centerCircleBorder = CircleBorder(side: BorderSide(width: 10, strokeAlign: BorderSide.strokeAlignCenter));
+    const CircleBorder centerCircleBorder = CircleBorder(side: BorderSide(width: 10, strokeAlign: StrokeAlign.center));
     expect(centerCircleBorder.dimensions, const EdgeInsets.all(5));
 
-    const CircleBorder outsideCircleBorder = CircleBorder(side: BorderSide(width: 10, strokeAlign: BorderSide.strokeAlignOutside));
+    const CircleBorder outsideCircleBorder = CircleBorder(side: BorderSide(width: 10, strokeAlign: StrokeAlign.outside));
     expect(outsideCircleBorder.dimensions, EdgeInsets.zero);
   });
-
-  test('RoundedRectangleBorder.lerp with different StrokeAlign', () {
-    const RoundedRectangleBorder rInside = RoundedRectangleBorder(side: BorderSide(width: 10.0));
-    const RoundedRectangleBorder rOutside = RoundedRectangleBorder(side: BorderSide(width: 20.0, strokeAlign: BorderSide.strokeAlignOutside));
-    const RoundedRectangleBorder rCenter = RoundedRectangleBorder(side: BorderSide(width: 15.0, strokeAlign: BorderSide.strokeAlignCenter));
-    expect(ShapeBorder.lerp(rInside, rOutside, 0.5), rCenter);
-  });
 }
diff --git a/packages/flutter/test/painting/shape_border_test.dart b/packages/flutter/test/painting/shape_border_test.dart
index fbb217b..632db92 100644
--- a/packages/flutter/test/painting/shape_border_test.dart
+++ b/packages/flutter/test/painting/shape_border_test.dart
@@ -13,49 +13,49 @@
     final Border b2 = Border.all(color: const Color(0xFF0000FF));
     expect(
       (b1 + b2).toString(),
-      'Border.all(BorderSide(color: Color(0xff00ff00))) + '
-      'Border.all(BorderSide(color: Color(0xff0000ff)))',
+      'Border.all(BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid)) + '
+      'Border.all(BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid))',
     );
     expect(
       (b1 + (b2 + b2)).toString(),
-      'Border.all(BorderSide(color: Color(0xff00ff00))) + '
-      'Border.all(BorderSide(color: Color(0xff0000ff), width: 2.0))',
+      'Border.all(BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid)) + '
+      'Border.all(BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid))',
     );
     expect(
       ((b1 + b2) + b2).toString(),
-      'Border.all(BorderSide(color: Color(0xff00ff00))) + '
-      'Border.all(BorderSide(color: Color(0xff0000ff), width: 2.0))',
+      'Border.all(BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid)) + '
+      'Border.all(BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid))',
     );
     expect((b1 + b2) + b2, b1 + (b2 + b2));
     expect(
       (b1 + b2).scale(3.0).toString(),
-      'Border.all(BorderSide(color: Color(0xff00ff00), width: 3.0)) + '
-      'Border.all(BorderSide(color: Color(0xff0000ff), width: 3.0))',
+      'Border.all(BorderSide(Color(0xff00ff00), 3.0, BorderStyle.solid)) + '
+      'Border.all(BorderSide(Color(0xff0000ff), 3.0, BorderStyle.solid))',
     );
     expect(
       (b1 + b2).scale(0.0).toString(),
-      'Border.all(BorderSide(color: Color(0xff00ff00), width: 0.0, style: none)) + '
-      'Border.all(BorderSide(color: Color(0xff0000ff), width: 0.0, style: none))',
+      'Border.all(BorderSide(Color(0xff00ff00), 0.0, BorderStyle.none)) + '
+      'Border.all(BorderSide(Color(0xff0000ff), 0.0, BorderStyle.none))',
     );
     expect(
       ShapeBorder.lerp(b2 + b1, b1 + b2, 0.0).toString(),
-      'Border.all(BorderSide(color: Color(0xff0000ff))) + '
-      'Border.all(BorderSide(color: Color(0xff00ff00)))',
+      'Border.all(BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid)) + '
+      'Border.all(BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid))',
     );
     expect(
       ShapeBorder.lerp(b2 + b1, b1 + b2, 0.25).toString(),
-      'Border.all(BorderSide(color: Color(0xff003fbf))) + '
-      'Border.all(BorderSide(color: Color(0xff00bf3f)))',
+      'Border.all(BorderSide(Color(0xff003fbf), 1.0, BorderStyle.solid)) + '
+      'Border.all(BorderSide(Color(0xff00bf3f), 1.0, BorderStyle.solid))',
     );
     expect(
       ShapeBorder.lerp(b2 + b1, b1 + b2, 0.5).toString(),
-      'Border.all(BorderSide(color: Color(0xff007f7f))) + '
-      'Border.all(BorderSide(color: Color(0xff007f7f)))',
+      'Border.all(BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid)) + '
+      'Border.all(BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid))',
     );
     expect(
       ShapeBorder.lerp(b2 + b1, b1 + b2, 1.0).toString(),
-      'Border.all(BorderSide(color: Color(0xff00ff00))) + '
-      'Border.all(BorderSide(color: Color(0xff0000ff)))',
+      'Border.all(BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid)) + '
+      'Border.all(BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid))',
     );
     expect((b1 + b2).dimensions, const EdgeInsets.all(2.0));
     const Rect rect = Rect.fromLTRB(11.0, 15.0, 299.0, 175.0);
@@ -78,49 +78,49 @@
     const BorderDirectional b2 = BorderDirectional(top: side2, start: side2, end: side2, bottom: side2);
     expect(
       (b1 + b2).toString(),
-      'BorderDirectional(top: BorderSide(color: Color(0xff00ff00)), start: BorderSide(color: Color(0xff00ff00)), end: BorderSide(color: Color(0xff00ff00)), bottom: BorderSide(color: Color(0xff00ff00))) + '
-      'BorderDirectional(top: BorderSide(color: Color(0xff0000ff)), start: BorderSide(color: Color(0xff0000ff)), end: BorderSide(color: Color(0xff0000ff)), bottom: BorderSide(color: Color(0xff0000ff)))',
+      'BorderDirectional(top: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid)) + '
+      'BorderDirectional(top: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid))',
     );
     expect(
       (b1 + (b2 + b2)).toString(),
-      'BorderDirectional(top: BorderSide(color: Color(0xff00ff00)), start: BorderSide(color: Color(0xff00ff00)), end: BorderSide(color: Color(0xff00ff00)), bottom: BorderSide(color: Color(0xff00ff00))) + '
-      'BorderDirectional(top: BorderSide(color: Color(0xff0000ff), width: 2.0), start: BorderSide(color: Color(0xff0000ff), width: 2.0), end: BorderSide(color: Color(0xff0000ff), width: 2.0), bottom: BorderSide(color: Color(0xff0000ff), width: 2.0))',
+      'BorderDirectional(top: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid)) + '
+      'BorderDirectional(top: BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid), start: BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid), end: BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid), bottom: BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid))',
     );
     expect(
       ((b1 + b2) + b2).toString(),
-      'BorderDirectional(top: BorderSide(color: Color(0xff00ff00)), start: BorderSide(color: Color(0xff00ff00)), end: BorderSide(color: Color(0xff00ff00)), bottom: BorderSide(color: Color(0xff00ff00))) + '
-      'BorderDirectional(top: BorderSide(color: Color(0xff0000ff), width: 2.0), start: BorderSide(color: Color(0xff0000ff), width: 2.0), end: BorderSide(color: Color(0xff0000ff), width: 2.0), bottom: BorderSide(color: Color(0xff0000ff), width: 2.0))',
+      'BorderDirectional(top: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid)) + '
+      'BorderDirectional(top: BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid), start: BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid), end: BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid), bottom: BorderSide(Color(0xff0000ff), 2.0, BorderStyle.solid))',
     );
     expect((b1 + b2) + b2, b1 + (b2 + b2));
     expect(
       (b1 + b2).scale(3.0).toString(),
-      'BorderDirectional(top: BorderSide(color: Color(0xff00ff00), width: 3.0), start: BorderSide(color: Color(0xff00ff00), width: 3.0), end: BorderSide(color: Color(0xff00ff00), width: 3.0), bottom: BorderSide(color: Color(0xff00ff00), width: 3.0)) + '
-      'BorderDirectional(top: BorderSide(color: Color(0xff0000ff), width: 3.0), start: BorderSide(color: Color(0xff0000ff), width: 3.0), end: BorderSide(color: Color(0xff0000ff), width: 3.0), bottom: BorderSide(color: Color(0xff0000ff), width: 3.0))',
+      'BorderDirectional(top: BorderSide(Color(0xff00ff00), 3.0, BorderStyle.solid), start: BorderSide(Color(0xff00ff00), 3.0, BorderStyle.solid), end: BorderSide(Color(0xff00ff00), 3.0, BorderStyle.solid), bottom: BorderSide(Color(0xff00ff00), 3.0, BorderStyle.solid)) + '
+      'BorderDirectional(top: BorderSide(Color(0xff0000ff), 3.0, BorderStyle.solid), start: BorderSide(Color(0xff0000ff), 3.0, BorderStyle.solid), end: BorderSide(Color(0xff0000ff), 3.0, BorderStyle.solid), bottom: BorderSide(Color(0xff0000ff), 3.0, BorderStyle.solid))',
     );
     expect(
       (b1 + b2).scale(0.0).toString(),
-      'BorderDirectional(top: BorderSide(color: Color(0xff00ff00), width: 0.0, style: none), start: BorderSide(color: Color(0xff00ff00), width: 0.0, style: none), end: BorderSide(color: Color(0xff00ff00), width: 0.0, style: none), bottom: BorderSide(color: Color(0xff00ff00), width: 0.0, style: none)) + '
-      'BorderDirectional(top: BorderSide(color: Color(0xff0000ff), width: 0.0, style: none), start: BorderSide(color: Color(0xff0000ff), width: 0.0, style: none), end: BorderSide(color: Color(0xff0000ff), width: 0.0, style: none), bottom: BorderSide(color: Color(0xff0000ff), width: 0.0, style: none))',
+      'BorderDirectional(top: BorderSide(Color(0xff00ff00), 0.0, BorderStyle.none), start: BorderSide(Color(0xff00ff00), 0.0, BorderStyle.none), end: BorderSide(Color(0xff00ff00), 0.0, BorderStyle.none), bottom: BorderSide(Color(0xff00ff00), 0.0, BorderStyle.none)) + '
+      'BorderDirectional(top: BorderSide(Color(0xff0000ff), 0.0, BorderStyle.none), start: BorderSide(Color(0xff0000ff), 0.0, BorderStyle.none), end: BorderSide(Color(0xff0000ff), 0.0, BorderStyle.none), bottom: BorderSide(Color(0xff0000ff), 0.0, BorderStyle.none))',
     );
     expect(
       ShapeBorder.lerp(b2 + b1, b1 + b2, 0.0).toString(),
-      'BorderDirectional(top: BorderSide(color: Color(0xff0000ff)), start: BorderSide(color: Color(0xff0000ff)), end: BorderSide(color: Color(0xff0000ff)), bottom: BorderSide(color: Color(0xff0000ff))) + '
-      'BorderDirectional(top: BorderSide(color: Color(0xff00ff00)), start: BorderSide(color: Color(0xff00ff00)), end: BorderSide(color: Color(0xff00ff00)), bottom: BorderSide(color: Color(0xff00ff00)))',
+      'BorderDirectional(top: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid)) + '
+      'BorderDirectional(top: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid))',
     );
     expect(
       ShapeBorder.lerp(b2 + b1, b1 + b2, 0.25).toString(),
-      'BorderDirectional(top: BorderSide(color: Color(0xff003fbf)), start: BorderSide(color: Color(0xff003fbf)), end: BorderSide(color: Color(0xff003fbf)), bottom: BorderSide(color: Color(0xff003fbf))) + '
-      'BorderDirectional(top: BorderSide(color: Color(0xff00bf3f)), start: BorderSide(color: Color(0xff00bf3f)), end: BorderSide(color: Color(0xff00bf3f)), bottom: BorderSide(color: Color(0xff00bf3f)))',
+      'BorderDirectional(top: BorderSide(Color(0xff003fbf), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff003fbf), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff003fbf), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff003fbf), 1.0, BorderStyle.solid)) + '
+      'BorderDirectional(top: BorderSide(Color(0xff00bf3f), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff00bf3f), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff00bf3f), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff00bf3f), 1.0, BorderStyle.solid))',
     );
     expect(
       ShapeBorder.lerp(b2 + b1, b1 + b2, 0.5).toString(),
-      'BorderDirectional(top: BorderSide(color: Color(0xff007f7f)), start: BorderSide(color: Color(0xff007f7f)), end: BorderSide(color: Color(0xff007f7f)), bottom: BorderSide(color: Color(0xff007f7f))) + '
-      'BorderDirectional(top: BorderSide(color: Color(0xff007f7f)), start: BorderSide(color: Color(0xff007f7f)), end: BorderSide(color: Color(0xff007f7f)), bottom: BorderSide(color: Color(0xff007f7f)))',
+      'BorderDirectional(top: BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid)) + '
+      'BorderDirectional(top: BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff007f7f), 1.0, BorderStyle.solid))',
     );
     expect(
       ShapeBorder.lerp(b2 + b1, b1 + b2, 1.0).toString(),
-      'BorderDirectional(top: BorderSide(color: Color(0xff00ff00)), start: BorderSide(color: Color(0xff00ff00)), end: BorderSide(color: Color(0xff00ff00)), bottom: BorderSide(color: Color(0xff00ff00))) + '
-      'BorderDirectional(top: BorderSide(color: Color(0xff0000ff)), start: BorderSide(color: Color(0xff0000ff)), end: BorderSide(color: Color(0xff0000ff)), bottom: BorderSide(color: Color(0xff0000ff)))',
+      'BorderDirectional(top: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff00ff00), 1.0, BorderStyle.solid)) + '
+      'BorderDirectional(top: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid), start: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid), end: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid), bottom: BorderSide(Color(0xff0000ff), 1.0, BorderStyle.solid))',
     );
     expect((b1 + b2).dimensions, const EdgeInsetsDirectional.fromSTEB(2.0, 2.0, 2.0, 2.0));
     const Rect rect = Rect.fromLTRB(11.0, 15.0, 299.0, 175.0);
diff --git a/packages/flutter/test/painting/stadium_border_test.dart b/packages/flutter/test/painting/stadium_border_test.dart
index 3902843..5b7edb5 100644
--- a/packages/flutter/test/painting/stadium_border_test.dart
+++ b/packages/flutter/test/painting/stadium_border_test.dart
@@ -48,8 +48,8 @@
   });
 
   test('StadiumBorder with StrokeAlign', () {
-    const StadiumBorder center = StadiumBorder(side: BorderSide(width: 10.0, strokeAlign: BorderSide.strokeAlignCenter));
-    const StadiumBorder outside = StadiumBorder(side: BorderSide(width: 10.0, strokeAlign: BorderSide.strokeAlignOutside));
+    const StadiumBorder center = StadiumBorder(side: BorderSide(width: 10.0, strokeAlign: StrokeAlign.center));
+    const StadiumBorder outside = StadiumBorder(side: BorderSide(width: 10.0, strokeAlign: StrokeAlign.outside));
     expect(center.dimensions, const EdgeInsets.all(5.0));
     expect(outside.dimensions, EdgeInsets.zero);
 
@@ -103,28 +103,28 @@
 
     expect(
       ShapeBorder.lerp(stadium, circle, 0.1).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), 10.0% of the way to being a CircleBorder)',
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), 10.0% of the way to being a CircleBorder)',
     );
     expect(
       ShapeBorder.lerp(stadium, circle, 0.2).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), 20.0% of the way to being a CircleBorder)',
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), 20.0% of the way to being a CircleBorder)',
     );
     expect(
       ShapeBorder.lerp(ShapeBorder.lerp(stadium, circle, 0.1), ShapeBorder.lerp(stadium, circle, 0.9), 0.9).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), 82.0% of the way to being a CircleBorder)',
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), 82.0% of the way to being a CircleBorder)',
     );
 
     expect(
       ShapeBorder.lerp(circle, stadium, 0.9).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), 10.0% of the way to being a CircleBorder)',
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), 10.0% of the way to being a CircleBorder)',
     );
     expect(
       ShapeBorder.lerp(circle, stadium, 0.8).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), 20.0% of the way to being a CircleBorder)',
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), 20.0% of the way to being a CircleBorder)',
     );
     expect(
       ShapeBorder.lerp(ShapeBorder.lerp(stadium, circle, 0.9), ShapeBorder.lerp(stadium, circle, 0.1), 0.1).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), 82.0% of the way to being a CircleBorder)',
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), 82.0% of the way to being a CircleBorder)',
     );
 
     expect(ShapeBorder.lerp(stadium, circle, 0.1), ShapeBorder.lerp(stadium, circle, 0.1));
@@ -182,33 +182,33 @@
 
     expect(
       ShapeBorder.lerp(stadium, rrect, 0.1).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), '
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), '
       'BorderRadius.zero, 10.0% of the way to being a RoundedRectangleBorder)',
     );
     expect(
       ShapeBorder.lerp(stadium, rrect, 0.2).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), '
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), '
       'BorderRadius.zero, 20.0% of the way to being a RoundedRectangleBorder)',
     );
     expect(
       ShapeBorder.lerp(ShapeBorder.lerp(stadium, rrect, 0.1), ShapeBorder.lerp(stadium, rrect, 0.9), 0.9).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), '
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), '
       'BorderRadius.zero, 82.0% of the way to being a RoundedRectangleBorder)',
     );
 
     expect(
       ShapeBorder.lerp(rrect, stadium, 0.9).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), '
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), '
       'BorderRadius.zero, 10.0% of the way to being a RoundedRectangleBorder)',
     );
     expect(
       ShapeBorder.lerp(rrect, stadium, 0.8).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), '
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), '
       'BorderRadius.zero, 20.0% of the way to being a RoundedRectangleBorder)',
     );
     expect(
       ShapeBorder.lerp(ShapeBorder.lerp(stadium, rrect, 0.9), ShapeBorder.lerp(stadium, rrect, 0.1), 0.1).toString(),
-      'StadiumBorder(BorderSide(width: 0.0, style: none), '
+      'StadiumBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none), '
       'BorderRadius.zero, 82.0% of the way to being a RoundedRectangleBorder)',
     );
 
diff --git a/packages/flutter/test/painting/star_border_test.dart b/packages/flutter/test/painting/star_border_test.dart
index d799485..fe336f1 100644
--- a/packages/flutter/test/painting/star_border_test.dart
+++ b/packages/flutter/test/painting/star_border_test.dart
@@ -105,9 +105,9 @@
     await testBorder(tester, 'side_1', const StarBorder(side: BorderSide(color: Color(0xffff0000))));
     await testBorder(tester, 'side_10', const StarBorder(side: BorderSide(color: Color(0xffff0000), width: 10)));
     await testBorder(tester, 'side_align_center',
-        const StarBorder(side: BorderSide(color: Color(0xffff0000), strokeAlign: BorderSide.strokeAlignCenter)));
+        const StarBorder(side: BorderSide(color: Color(0xffff0000), strokeAlign: StrokeAlign.center)));
     await testBorder(tester, 'side_align_outside',
-        const StarBorder(side: BorderSide(color: Color(0xffff0000), strokeAlign: BorderSide.strokeAlignOutside)));
+        const StarBorder(side: BorderSide(color: Color(0xffff0000), strokeAlign: StrokeAlign.outside)));
   });
 
   testWidgets('StarBorder.polygon parameters', (WidgetTester tester) async {
@@ -127,9 +127,9 @@
     await testBorder(
         tester, 'poly_side_10', const StarBorder.polygon(side: BorderSide(color: Color(0xffff0000), width: 10)));
     await testBorder(tester, 'poly_side_align_center',
-        const StarBorder.polygon(side: BorderSide(color: Color(0xffff0000), strokeAlign: BorderSide.strokeAlignCenter)));
+        const StarBorder.polygon(side: BorderSide(color: Color(0xffff0000), strokeAlign: StrokeAlign.center)));
     await testBorder(tester, 'poly_side_align_outside',
-        const StarBorder.polygon(side: BorderSide(color: Color(0xffff0000), strokeAlign: BorderSide.strokeAlignOutside)));
+        const StarBorder.polygon(side: BorderSide(color: Color(0xffff0000), strokeAlign: StrokeAlign.outside)));
   });
 
   testWidgets('StarBorder lerped with StarBorder', (WidgetTester tester) async {