flutter_flutter/packages/flutter/test/widgets/constrained_box_test.dart

// 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/widgets.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('Placeholder intrinsics', (WidgetTester tester) async {
    await tester.pumpWidget(const Placeholder());
    expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).getMinIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).getMaxIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).getMinIntrinsicHeight(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).getMaxIntrinsicHeight(double.infinity), 0.0);
  });

  testWidgets('ConstrainedBox intrinsics - minHeight', (WidgetTester tester) async {
    await tester.pumpWidget(
      ConstrainedBox(
        constraints: const BoxConstraints(
          minHeight: 20.0,
        ),
        child: const Placeholder(),
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicHeight(double.infinity), 20.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicHeight(double.infinity), 20.0);
  });

  testWidgets('ConstrainedBox intrinsics - minWidth', (WidgetTester tester) async {
    await tester.pumpWidget(
      ConstrainedBox(
        constraints: const BoxConstraints(
          minWidth: 20.0,
        ),
        child: const Placeholder(),
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicWidth(double.infinity), 20.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicWidth(double.infinity), 20.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicHeight(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicHeight(double.infinity), 0.0);
  });

  testWidgets('ConstrainedBox intrinsics - maxHeight', (WidgetTester tester) async {
    await tester.pumpWidget(
      ConstrainedBox(
        constraints: const BoxConstraints(
          maxHeight: 20.0,
        ),
        child: const Placeholder(),
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicHeight(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicHeight(double.infinity), 0.0);
  });

  testWidgets('ConstrainedBox intrinsics - maxWidth', (WidgetTester tester) async {
    await tester.pumpWidget(
      ConstrainedBox(
        constraints: const BoxConstraints(
          maxWidth: 20.0,
        ),
        child: const Placeholder(),
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicHeight(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicHeight(double.infinity), 0.0);
  });

  testWidgets('ConstrainedBox intrinsics - tight', (WidgetTester tester) async {
    await tester.pumpWidget(
      ConstrainedBox(
        constraints: const BoxConstraints.tightFor(width: 10.0, height: 30.0),
        child: const Placeholder(),
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicWidth(double.infinity), 10.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicWidth(double.infinity), 10.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicHeight(double.infinity), 30.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicHeight(double.infinity), 30.0);
  });


  testWidgets('ConstrainedBox intrinsics - minHeight - with infinite width', (WidgetTester tester) async {
    await tester.pumpWidget(
      ConstrainedBox(
        constraints: const BoxConstraints(
          minWidth: double.infinity,
          minHeight: 20.0,
        ),
        child: const Placeholder(),
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicHeight(double.infinity), 20.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicHeight(double.infinity), 20.0);
  });

  testWidgets('ConstrainedBox intrinsics - minWidth - with infinite height', (WidgetTester tester) async {
    await tester.pumpWidget(
      ConstrainedBox(
        constraints: const BoxConstraints(
          minWidth: 20.0,
          minHeight: double.infinity,
        ),
        child: const Placeholder(),
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicWidth(double.infinity), 20.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicWidth(double.infinity), 20.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicHeight(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicHeight(double.infinity), 0.0);
  });

  testWidgets('ConstrainedBox intrinsics - infinite', (WidgetTester tester) async {
    await tester.pumpWidget(
      ConstrainedBox(
        constraints: const BoxConstraints.tightFor(width: double.infinity, height: double.infinity),
        child: const Placeholder(),
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicWidth(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMinIntrinsicHeight(double.infinity), 0.0);
    expect(tester.renderObject<RenderBox>(find.byType(ConstrainedBox)).getMaxIntrinsicHeight(double.infinity), 0.0);
  });
}