packages/flutter/test/material/stepper_test.dart

// Copyright 2016 The Chromium 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('Stepper tap callback test', (WidgetTester tester) async {
    int index = 0;

    await tester.pumpWidget(
      new MaterialApp(
        home: new Material(
          child: new Stepper(
            onStepTapped: (int i) {
              index = i;
            },
            steps: const <Step>[
              const Step(
                title: const Text('Step 1'),
                content: const SizedBox(
                  width: 100.0,
                  height: 100.0,
                ),
              ),
              const Step(
                title: const Text('Step 2'),
                content: const SizedBox(
                  width: 100.0,
                  height: 100.0,
                ),
              ),
            ],
          ),
        ),
      ),
    );
    await tester.tap(find.text('Step 2'));
    expect(index, 1);
  });

  testWidgets('Stepper expansion test', (WidgetTester tester) async {
    await tester.pumpWidget(
      new MaterialApp(
        home: new Center(
          child: new Material(
            child: new Stepper(
              steps: const <Step>[
                const Step(
                  title: const Text('Step 1'),
                  content: const SizedBox(
                    width: 100.0,
                    height: 100.0,
                  ),
                ),
                const Step(
                  title: const Text('Step 2'),
                  content: const SizedBox(
                    width: 200.0,
                    height: 200.0,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );

    RenderBox box = tester.renderObject(find.byType(Stepper));
    expect(box.size.height, 332.0);

    await tester.pumpWidget(
      new MaterialApp(
        home: new Center(
          child: new Material(
            child: new Stepper(
              currentStep: 1,
              steps: const <Step>[
                const Step(
                  title: const Text('Step 1'),
                  content: const SizedBox(
                    width: 100.0,
                    height: 100.0,
                  ),
                ),
                const Step(
                  title: const Text('Step 2'),
                  content: const SizedBox(
                    width: 200.0,
                    height: 200.0,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );

    await tester.pump(const Duration(milliseconds: 100));
    box = tester.renderObject(find.byType(Stepper));
    expect(box.size.height, greaterThan(332.0));
    await tester.pump(const Duration(milliseconds: 100));
    box = tester.renderObject(find.byType(Stepper));
    expect(box.size.height, 432.0);
  });

  testWidgets('Stepper horizontal size test', (WidgetTester tester) async {
    await tester.pumpWidget(
      new MaterialApp(
        home: new Center(
          child: new Material(
            child: new Stepper(
              type: StepperType.horizontal,
              steps: const <Step>[
                const Step(
                  title: const Text('Step 1'),
                  content: const SizedBox(
                    width: 100.0,
                    height: 100.0,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );

    final RenderBox box = tester.renderObject(find.byType(Stepper));
    expect(box.size.height, 600.0);
  });

  testWidgets('Stepper visibility test', (WidgetTester tester) async {
    await tester.pumpWidget(
      new MaterialApp(
        home: new Material(
          child: new Stepper(
            type: StepperType.horizontal,
            steps: const <Step>[
              const Step(
                title: const Text('Step 1'),
                content: const Text('A'),
              ),
              const Step(
                title: const Text('Step 2'),
                content: const Text('B'),
              ),
            ],
          ),
        ),
      ),
    );

    expect(find.text('A'), findsOneWidget);
    expect(find.text('B'), findsNothing);

    await tester.pumpWidget(
      new MaterialApp(
        home: new Material(
          child: new Stepper(
            currentStep: 1,
            type: StepperType.horizontal,
            steps: const <Step>[
              const Step(
                title: const Text('Step 1'),
                content: const Text('A'),
              ),
              const Step(
                title: const Text('Step 2'),
                content: const Text('B'),
              ),
            ],
          ),
        ),
      ),
    );

    expect(find.text('A'), findsNothing);
    expect(find.text('B'), findsOneWidget);
  });

  testWidgets('Stepper button test', (WidgetTester tester) async {
    bool continuePressed = false;
    bool cancelPressed = false;

    await tester.pumpWidget(
      new MaterialApp(
        home: new Material(
          child: new Stepper(
            type: StepperType.horizontal,
            onStepContinue: () {
              continuePressed = true;
            },
            onStepCancel: () {
              cancelPressed = true;
            },
            steps: const <Step>[
              const Step(
                title: const Text('Step 1'),
                content: const SizedBox(
                  width: 100.0,
                  height: 100.0,
                ),
              ),
              const Step(
                title: const Text('Step 2'),
                content: const SizedBox(
                  width: 200.0,
                  height: 200.0,
                ),
              ),
            ],
          ),
        ),
      ),
    );

    await tester.tap(find.text('CONTINUE'));
    await tester.tap(find.text('CANCEL'));

    expect(continuePressed, isTrue);
    expect(cancelPressed, isTrue);
  });

  testWidgets('Stepper disabled step test', (WidgetTester tester) async {
    int index = 0;

    await tester.pumpWidget(
      new MaterialApp(
        home: new Material(
          child: new Stepper(
            onStepTapped: (int i) {
              index = i;
            },
            steps: const <Step>[
              const Step(
                title: const Text('Step 1'),
                content: const SizedBox(
                  width: 100.0,
                  height: 100.0,
                ),
              ),
              const Step(
                title: const Text('Step 2'),
                state: StepState.disabled,
                content: const SizedBox(
                  width: 100.0,
                  height: 100.0,
                ),
              ),
            ],
          ),
        ),
      ),
    );

    await tester.tap(find.text('Step 2'));
    expect(index, 0);
  });

  testWidgets('Stepper scroll test', (WidgetTester tester) async {
    await tester.pumpWidget(
      new MaterialApp(
        home: new Material(
          child: new Stepper(
            steps: const <Step>[
              const Step(
                title: const Text('Step 1'),
                content: const SizedBox(
                  width: 100.0,
                  height: 300.0,
                ),
              ),
              const Step(
                title: const Text('Step 2'),
                content: const SizedBox(
                  width: 100.0,
                  height: 300.0,
                ),
              ),
              const Step(
                title: const Text('Step 3'),
                content: const SizedBox(
                  width: 100.0,
                  height: 100.0,
                ),
              ),
            ],
          ),
        ),
      ),
    );

    final ScrollableState scrollableState = tester.firstState(find.byType(Scrollable));
    expect(scrollableState.position.pixels, 0.0);

    await tester.tap(find.text('Step 3'));
    await tester.pumpWidget(
      new MaterialApp(
        home: new Material(
          child: new Stepper(
            currentStep: 2,
            steps: const <Step>[
              const Step(
                title: const Text('Step 1'),
                content: const SizedBox(
                  width: 100.0,
                  height: 300.0,
                ),
              ),
              const Step(
                title: const Text('Step 2'),
                content: const SizedBox(
                  width: 100.0,
                  height: 300.0,
                ),
              ),
              const Step(
                title: const Text('Step 3'),
                content: const SizedBox(
                  width: 100.0,
                  height: 100.0,
                ),
              ),
            ],
          ),
        ),
      ),
    );

    await tester.pump(const Duration(milliseconds: 100));
    expect(scrollableState.position.pixels, greaterThan(0.0));
  });

  testWidgets('Stepper index test', (WidgetTester tester) async {
    await tester.pumpWidget(
      new MaterialApp(
        home: new Center(
          child: new Material(
            child: new Stepper(
              steps: const <Step>[
                const Step(
                  title: const Text('A'),
                  state: StepState.complete,
                  content: const SizedBox(
                    width: 100.0,
                    height: 100.0,
                  ),
                ),
                const Step(
                  title: const Text('B'),
                  content: const SizedBox(
                    width: 100.0,
                    height: 100.0,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );

    expect(find.text('1'), findsNothing);
    expect(find.text('2'), findsOneWidget);
  });

  testWidgets('Stepper error test', (WidgetTester tester) async {
    await tester.pumpWidget(
      new MaterialApp(
        home: new Center(
          child: new Material(
            child: new Stepper(
              steps: const <Step>[
                const Step(
                  title: const Text('A'),
                  state: StepState.error,
                  content: const SizedBox(
                    width: 100.0,
                    height: 100.0,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );

    expect(find.text('!'), findsOneWidget);
  });
}