packages/flutter/test/widgets/placeholder_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/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('Placeholder', (WidgetTester tester) async {
    await tester.pumpWidget(const Placeholder());
    expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(800.0, 600.0));
    await tester.pumpWidget(const Center(child: Placeholder()));
    expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(800.0, 600.0));
    await tester.pumpWidget(
      const Stack(
        textDirection: TextDirection.ltr,
        children: <Widget>[Positioned(top: 0.0, bottom: 0.0, child: Placeholder())],
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(400.0, 600.0));
    await tester.pumpWidget(
      const Stack(
        textDirection: TextDirection.ltr,
        children: <Widget>[Positioned(left: 0.0, right: 0.0, child: Placeholder())],
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(800.0, 400.0));
    await tester.pumpWidget(
      const Stack(
        textDirection: TextDirection.ltr,
        children: <Widget>[
          Positioned(top: 0.0, child: Placeholder(fallbackWidth: 200.0, fallbackHeight: 300.0)),
        ],
      ),
    );
    expect(tester.renderObject<RenderBox>(find.byType(Placeholder)).size, const Size(200.0, 300.0));
  });

  testWidgets('Placeholder color', (WidgetTester tester) async {
    await tester.pumpWidget(const Placeholder());
    expect(
      tester.renderObject(find.byType(Placeholder)),
      paints..path(color: const Color(0xFF455A64)),
    );
    await tester.pumpWidget(const Placeholder(color: Color(0xFF00FF00)));
    expect(
      tester.renderObject(find.byType(Placeholder)),
      paints..path(color: const Color(0xFF00FF00)),
    );
  });

  testWidgets('Placeholder stroke width', (WidgetTester tester) async {
    await tester.pumpWidget(const Placeholder());
    expect(tester.renderObject(find.byType(Placeholder)), paints..path(strokeWidth: 2.0));
    await tester.pumpWidget(const Placeholder(strokeWidth: 10.0));
    expect(tester.renderObject(find.byType(Placeholder)), paints..path(strokeWidth: 10.0));
  });

  testWidgets('Placeholder child widget', (WidgetTester tester) async {
    await tester.pumpWidget(const Placeholder());
    expect(find.text('Label'), findsNothing);
    await tester.pumpWidget(const MaterialApp(home: Placeholder(child: Text('Label'))));
    expect(find.text('Label'), findsOneWidget);
  });
}