// 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'; void main() { test('BoxConstraints toString', () { expect(const BoxConstraints.expand().toString(), contains('biggest')); expect(const BoxConstraints().toString(), contains('unconstrained')); expect(const BoxConstraints.tightFor(width: 50.0).toString(), contains('w=50')); }); test('BoxConstraints copyWith', () { const BoxConstraints constraints = BoxConstraints( minWidth: 3.0, maxWidth: 7.0, minHeight: 11.0, maxHeight: 17.0, ); BoxConstraints copy = constraints.copyWith(); expect(copy, equals(constraints)); copy = constraints.copyWith( minWidth: 13.0, maxWidth: 17.0, minHeight: 111.0, maxHeight: 117.0, ); expect(copy.minWidth, 13.0); expect(copy.maxWidth, 17.0); expect(copy.minHeight, 111.0); expect(copy.maxHeight, 117.0); expect(copy, isNot(equals(constraints))); expect(copy.hashCode, isNot(equals(constraints.hashCode))); }); test('BoxConstraints operators', () { const BoxConstraints constraints = BoxConstraints( minWidth: 3.0, maxWidth: 7.0, minHeight: 11.0, maxHeight: 17.0, ); BoxConstraints copy = constraints * 2.0; expect(copy.minWidth, 6.0); expect(copy.maxWidth, 14.0); expect(copy.minHeight, 22.0); expect(copy.maxHeight, 34.0); expect(copy / 2.0, equals(constraints)); copy = constraints ~/ 2.0; expect(copy.minWidth, 1.0); expect(copy.maxWidth, 3.0); expect(copy.minHeight, 5.0); expect(copy.maxHeight, 8.0); copy = constraints % 3.0; expect(copy.minWidth, 0.0); expect(copy.maxWidth, 1.0); expect(copy.minHeight, 2.0); expect(copy.maxHeight, 2.0); }); test('BoxConstraints lerp', () { expect(BoxConstraints.lerp(null, null, 0.5), isNull); const BoxConstraints constraints = BoxConstraints( minWidth: 3.0, maxWidth: 7.0, minHeight: 11.0, maxHeight: 17.0, ); BoxConstraints copy = BoxConstraints.lerp(null, constraints, 0.5)!; expect(copy.minWidth, moreOrLessEquals(1.5)); expect(copy.maxWidth, moreOrLessEquals(3.5)); expect(copy.minHeight, moreOrLessEquals(5.5)); expect(copy.maxHeight, moreOrLessEquals(8.5)); copy = BoxConstraints.lerp(constraints, null, 0.5)!; expect(copy.minWidth, moreOrLessEquals(1.5)); expect(copy.maxWidth, moreOrLessEquals(3.5)); expect(copy.minHeight, moreOrLessEquals(5.5)); expect(copy.maxHeight, moreOrLessEquals(8.5)); copy = BoxConstraints.lerp(const BoxConstraints( minWidth: 13.0, maxWidth: 17.0, minHeight: 111.0, maxHeight: 117.0, ), constraints, 0.2)!; expect(copy.minWidth, moreOrLessEquals(11.0)); expect(copy.maxWidth, moreOrLessEquals(15.0)); expect(copy.minHeight, moreOrLessEquals(91.0)); expect(copy.maxHeight, moreOrLessEquals(97.0)); }); test('BoxConstraints.lerp identical a,b', () { expect(BoxConstraints.lerp(null, null, 0), null); const BoxConstraints constraints = BoxConstraints(); expect(identical(BoxConstraints.lerp(constraints, constraints, 0.5), constraints), true); }); test('BoxConstraints lerp with unbounded width', () { const BoxConstraints constraints1 = BoxConstraints( minWidth: double.infinity, minHeight: 10.0, maxHeight: 20.0, ); const BoxConstraints constraints2 = BoxConstraints( minWidth: double.infinity, minHeight: 20.0, maxHeight: 30.0, ); const BoxConstraints constraints3 = BoxConstraints( minWidth: double.infinity, minHeight: 15.0, maxHeight: 25.0, ); expect(BoxConstraints.lerp(constraints1, constraints2, 0.5), constraints3); }); test('BoxConstraints lerp with unbounded height', () { const BoxConstraints constraints1 = BoxConstraints( minWidth: 10.0, maxWidth: 20.0, minHeight: double.infinity, ); const BoxConstraints constraints2 = BoxConstraints( minWidth: 20.0, maxWidth: 30.0, minHeight: double.infinity, ); const BoxConstraints constraints3 = BoxConstraints( minWidth: 15.0, maxWidth: 25.0, minHeight: double.infinity, ); expect(BoxConstraints.lerp(constraints1, constraints2, 0.5), constraints3); }); test('BoxConstraints lerp from bounded to unbounded', () { const BoxConstraints constraints1 = BoxConstraints( minWidth: double.infinity, minHeight: double.infinity, ); const BoxConstraints constraints2 = BoxConstraints( minWidth: 20.0, maxWidth: 30.0, minHeight: double.infinity, ); const BoxConstraints constraints3 = BoxConstraints( minWidth: double.infinity, minHeight: 20.0, maxHeight: 30.0, ); expect(() => BoxConstraints.lerp(constraints1, constraints2, 0.5), throwsAssertionError); expect(() => BoxConstraints.lerp(constraints1, constraints3, 0.5), throwsAssertionError); expect(() => BoxConstraints.lerp(constraints2, constraints3, 0.5), throwsAssertionError); }); test('BoxConstraints normalize', () { const BoxConstraints constraints = BoxConstraints( minWidth: 3.0, maxWidth: 2.0, minHeight: 11.0, maxHeight: 18.0, ); final BoxConstraints copy = constraints.normalize(); expect(copy.minWidth, 3.0); expect(copy.maxWidth, 3.0); expect(copy.minHeight, 11.0); expect(copy.maxHeight, 18.0); }); }