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// 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/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import 'rendering_tester.dart';
void main() {
TestRenderingFlutterBinding.ensureInitialized();
test('RenderFractionallySizedBox constraints', () {
RenderBox root, leaf, test;
root = RenderPositionedBox(
child: RenderConstrainedBox(
additionalConstraints: BoxConstraints.tight(const Size(200.0, 200.0)),
child: test = RenderFractionallySizedOverflowBox(
widthFactor: 2.0,
heightFactor: 0.5,
child: leaf = RenderConstrainedBox(
additionalConstraints: const BoxConstraints.expand(),
),
),
),
);
layout(root);
expect(root.size.width, equals(800.0));
expect(root.size.height, equals(600.0));
expect(test.size.width, equals(200.0));
expect(test.size.height, equals(200.0));
expect(leaf.size.width, equals(400.0));
expect(leaf.size.height, equals(100.0));
});
test('BoxConstraints with NaN', () {
String result;
result = 'no exception';
try {
const BoxConstraints constraints = BoxConstraints(minWidth: double.nan, maxWidth: double.nan, minHeight: 2.0, maxHeight: double.nan);
assert(constraints.debugAssertIsValid());
} on FlutterError catch (e) {
result = '$e';
}
expect(result, equals(
'BoxConstraints has NaN values in minWidth, maxWidth, and maxHeight.\n'
'The offending constraints were:\n'
' BoxConstraints(NaN<=w<=NaN, 2.0<=h<=NaN; NOT NORMALIZED)',
));
result = 'no exception';
try {
const BoxConstraints constraints = BoxConstraints(minHeight: double.nan);
assert(constraints.debugAssertIsValid());
} on FlutterError catch (e) {
result = '$e';
}
expect(result, equals(
'BoxConstraints has a NaN value in minHeight.\n'
'The offending constraints were:\n'
' BoxConstraints(0.0<=w<=Infinity, NaN<=h<=Infinity; NOT NORMALIZED)',
));
result = 'no exception';
try {
const BoxConstraints constraints = BoxConstraints(minHeight: double.nan, maxWidth: 0.0/0.0);
assert(constraints.debugAssertIsValid());
} on FlutterError catch (e) {
result = '$e';
}
expect(result, equals(
'BoxConstraints has NaN values in maxWidth and minHeight.\n'
'The offending constraints were:\n'
' BoxConstraints(0.0<=w<=NaN, NaN<=h<=Infinity; NOT NORMALIZED)',
));
});
}