Make sure that a Checkbox doesn't crash in 0x0 environment (#173178)

This is my attempt to handle
https://github.com/flutter/flutter/issues/6537 for the Checkbox UI
control.

packages/flutter/test/material/checkbox_test.dart

diff --git a/packages/flutter/test/material/checkbox_test.dart b/packages/flutter/test/material/checkbox_test.dart
index 01a9516..549abbc 100644
--- a/packages/flutter/test/material/checkbox_test.dart
+++ b/packages/flutter/test/material/checkbox_test.dart
@@ -2476,6 +2476,17 @@
     );
     expect(getCheckboxRenderer(), paints..path(color: inactiveBackgroundColor));
   });
+
+  testWidgets('Checkbox renders at zero area', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: Center(
+          child: SizedBox.shrink(child: Scaffold(body: Checkbox(value: true, onChanged: null))),
+        ),
+      ),
+    );
+    expect(tester.takeException(), isNull);
+  });
 }
 
 class _SelectedGrabMouseCursor extends MaterialStateMouseCursor {