floating_action_button_test.dart 25.8 KB
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// 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.

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@TestOn('!chrome') // whole file needs triage.
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import 'dart:ui';

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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter_test/flutter_test.dart';

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import '../rendering/mock_canvas.dart';
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import '../widgets/semantics_tester.dart';

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void main() {
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  testWidgets('Floating Action Button control test', (WidgetTester tester) async {
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    bool didPressButton = false;
    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
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        child: Center(
          child: FloatingActionButton(
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            onPressed: () {
              didPressButton = true;
            },
            child: const Icon(Icons.add),
          ),
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        ),
      ),
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    );

    expect(didPressButton, isFalse);
    await tester.tap(find.byType(Icon));
    expect(didPressButton, isTrue);
  });
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  testWidgets('Floating Action Button tooltip', (WidgetTester tester) async {
    await tester.pumpWidget(
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      MaterialApp(
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        home: Scaffold(
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          floatingActionButton: FloatingActionButton(
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            onPressed: () {},
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            tooltip: 'Add',
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            child: const Icon(Icons.add),
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          ),
        ),
      ),
    );

    await tester.tap(find.byType(Icon));
    expect(find.byTooltip('Add'), findsOneWidget);
  });
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  // Regression test for: https://github.com/flutter/flutter/pull/21084
  testWidgets('Floating Action Button tooltip (long press button edge)', (WidgetTester tester) async {
    await tester.pumpWidget(
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      MaterialApp(
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        home: Scaffold(
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          floatingActionButton: FloatingActionButton(
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            onPressed: () {},
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            tooltip: 'Add',
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            child: const Icon(Icons.add),
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          ),
        ),
      ),
    );

    expect(find.text('Add'), findsNothing);
    await tester.longPressAt(_rightEdgeOfFab(tester));
    await tester.pumpAndSettle();

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

  // Regression test for: https://github.com/flutter/flutter/pull/21084
  testWidgets('Floating Action Button tooltip (long press button edge - no child)', (WidgetTester tester) async {
    await tester.pumpWidget(
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      MaterialApp(
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        home: Scaffold(
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          floatingActionButton: FloatingActionButton(
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            onPressed: () {},
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            tooltip: 'Add',
          ),
        ),
      ),
    );

    expect(find.text('Add'), findsNothing);
    await tester.longPressAt(_rightEdgeOfFab(tester));
    await tester.pumpAndSettle();

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

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  testWidgets('Floating Action Button tooltip (no child)', (WidgetTester tester) async {
    await tester.pumpWidget(
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      MaterialApp(
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        home: Scaffold(
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          floatingActionButton: FloatingActionButton(
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            onPressed: () {},
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            tooltip: 'Add',
          ),
        ),
      ),
    );

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    expect(find.text('Add'), findsNothing);
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    // Test hover for tooltip.
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    TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
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    await gesture.addPointer();
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    addTearDown(() => gesture?.removePointer());
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    await gesture.moveTo(tester.getCenter(find.byType(FloatingActionButton)));
    await tester.pumpAndSettle();

    expect(find.text('Add'), findsOneWidget);

    await gesture.moveTo(Offset.zero);
    await gesture.removePointer();
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    gesture = null;
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    await tester.pumpAndSettle();

    expect(find.text('Add'), findsNothing);

    // Test long press for tooltip.
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    await tester.longPress(find.byType(FloatingActionButton));
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    await tester.pumpAndSettle();
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    expect(find.text('Add'), findsOneWidget);
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  });

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  testWidgets('Floating Action Button tooltip reacts when disabled', (WidgetTester tester) async {
    await tester.pumpWidget(
      const MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: null,
            tooltip: 'Add',
          ),
        ),
      ),
    );

    expect(find.text('Add'), findsNothing);

    // Test hover for tooltip.
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    TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
    await gesture.addPointer();
    addTearDown(() => gesture?.removePointer());
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    await tester.pumpAndSettle();
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    await gesture.moveTo(tester.getCenter(find.byType(FloatingActionButton)));
    await tester.pumpAndSettle();

    expect(find.text('Add'), findsOneWidget);

    await gesture.moveTo(Offset.zero);
    await gesture.removePointer();
    gesture = null;
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    await tester.pumpAndSettle();

    expect(find.text('Add'), findsNothing);

    // Test long press for tooltip.
    await tester.longPress(find.byType(FloatingActionButton));
    await tester.pumpAndSettle();

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

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  testWidgets('Floating Action Button elevation when highlighted - effect', (WidgetTester tester) async {
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: () { },
          ),
        ),
      ),
    );
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
    final TestGesture gesture = await tester.press(find.byType(PhysicalShape));
    await tester.pump();
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
    await tester.pump(const Duration(seconds: 1));
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 12.0);
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: () { },
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            highlightElevation: 20.0,
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          ),
        ),
      ),
    );
    await tester.pump();
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 12.0);
    await tester.pump(const Duration(seconds: 1));
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 20.0);
    await gesture.up();
    await tester.pump();
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 20.0);
    await tester.pump(const Duration(seconds: 1));
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
  });

  testWidgets('Floating Action Button elevation when disabled - defaults', (WidgetTester tester) async {
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    await tester.pumpWidget(
      const MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: null,
          ),
        ),
      ),
    );

    // Disabled elevation defaults to regular default elevation.
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
  });

  testWidgets('Floating Action Button elevation when disabled - override', (WidgetTester tester) async {
    await tester.pumpWidget(
      const MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: null,
            disabledElevation: 0,
          ),
        ),
      ),
    );

    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 0.0);
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  });

  testWidgets('Floating Action Button elevation when disabled - effect', (WidgetTester tester) async {
    await tester.pumpWidget(
      const MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: null,
          ),
        ),
      ),
    );
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
    await tester.pumpWidget(
      const MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: null,
            disabledElevation: 3.0,
          ),
        ),
      ),
    );
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
    await tester.pump(const Duration(seconds: 1));
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 3.0);
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: () { },
            disabledElevation: 3.0,
          ),
        ),
      ),
    );
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 3.0);
    await tester.pump(const Duration(seconds: 1));
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
  });

  testWidgets('Floating Action Button elevation when disabled while highlighted - effect', (WidgetTester tester) async {
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: () { },
          ),
        ),
      ),
    );
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
    await tester.press(find.byType(PhysicalShape));
    await tester.pump();
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
    await tester.pump(const Duration(seconds: 1));
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 12.0);
    await tester.pumpWidget(
      const MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: null,
          ),
        ),
      ),
    );
    await tester.pump();
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 12.0);
    await tester.pump(const Duration(seconds: 1));
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
            onPressed: () { },
          ),
        ),
      ),
    );
    await tester.pump();
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
    await tester.pump(const Duration(seconds: 1));
    expect(tester.widget<PhysicalShape>(find.byType(PhysicalShape)).elevation, 6.0);
  });

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  testWidgets('FlatActionButton mini size is configurable by ThemeData.materialTapTargetSize', (WidgetTester tester) async {
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    final Key key1 = UniqueKey();
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    await tester.pumpWidget(
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      MaterialApp(
        home: Theme(
          data: ThemeData(materialTapTargetSize: MaterialTapTargetSize.padded),
          child: Scaffold(
            floatingActionButton: FloatingActionButton(
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              key: key1,
              mini: true,
              onPressed: null,
            ),
          ),
        ),
      ),
    );

    expect(tester.getSize(find.byKey(key1)), const Size(48.0, 48.0));

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    final Key key2 = UniqueKey();
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    await tester.pumpWidget(
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      MaterialApp(
        home: Theme(
          data: ThemeData(materialTapTargetSize: MaterialTapTargetSize.shrinkWrap),
          child: Scaffold(
            floatingActionButton: FloatingActionButton(
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              key: key2,
              mini: true,
              onPressed: null,
            ),
          ),
        ),
      ),
    );

    expect(tester.getSize(find.byKey(key2)), const Size(40.0, 40.0));
  });

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  testWidgets('FloatingActionButton.isExtended', (WidgetTester tester) async {
    await tester.pumpWidget(
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      const MaterialApp(
        home: Scaffold(
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          floatingActionButton: FloatingActionButton(onPressed: null),
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        ),
      ),
    );

    final Finder fabFinder = find.byType(FloatingActionButton);

    FloatingActionButton getFabWidget() {
      return tester.widget<FloatingActionButton>(fabFinder);
    }

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    final Finder materialButtonFinder = find.byType(RawMaterialButton);

    RawMaterialButton getRawMaterialButtonWidget() {
      return tester.widget<RawMaterialButton>(materialButtonFinder);
    }

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    expect(getFabWidget().isExtended, false);
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    expect(getRawMaterialButtonWidget().shape, const CircleBorder());
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    await tester.pumpWidget(
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      MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton.extended(
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            label: const SizedBox(
              width: 100.0,
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              child: Text('label'),
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            ),
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            icon: const Icon(Icons.android),
            onPressed: null,
          ),
        ),
      ),
    );

    expect(getFabWidget().isExtended, true);
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    expect(getRawMaterialButtonWidget().shape, const StadiumBorder());
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    expect(find.text('label'), findsOneWidget);
    expect(find.byType(Icon), findsOneWidget);

    // Verify that the widget's height is 48 and that its internal
    /// horizontal layout is: 16 icon 8 label 20
    expect(tester.getSize(fabFinder).height, 48.0);
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    final double fabLeft = tester.getTopLeft(fabFinder).dx;
    final double fabRight = tester.getTopRight(fabFinder).dx;
    final double iconLeft = tester.getTopLeft(find.byType(Icon)).dx;
    final double iconRight = tester.getTopRight(find.byType(Icon)).dx;
    final double labelLeft = tester.getTopLeft(find.text('label')).dx;
    final double labelRight = tester.getTopRight(find.text('label')).dx;
    expect(iconLeft - fabLeft, 16.0);
    expect(labelLeft - iconRight, 8.0);
    expect(fabRight - labelRight, 20.0);
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    // The overall width of the button is:
    // 168 = 16 + 24(icon) + 8 + 100(label) + 20
    expect(tester.getSize(find.byType(Icon)).width, 24.0);
    expect(tester.getSize(find.text('label')).width, 100.0);
    expect(tester.getSize(fabFinder).width, 168);
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  });

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  testWidgets('FloatingActionButton.isExtended (without icon)', (WidgetTester tester) async {
    final Finder fabFinder = find.byType(FloatingActionButton);

    FloatingActionButton getFabWidget() {
      return tester.widget<FloatingActionButton>(fabFinder);
    }

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    final Finder materialButtonFinder = find.byType(RawMaterialButton);

    RawMaterialButton getRawMaterialButtonWidget() {
      return tester.widget<RawMaterialButton>(materialButtonFinder);
    }

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    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton.extended(
            label: const SizedBox(
              width: 100.0,
              child: Text('label'),
            ),
            onPressed: null,
          ),
        ),
      ),
    );

    expect(getFabWidget().isExtended, true);
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    expect(getRawMaterialButtonWidget().shape, const StadiumBorder());
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    expect(find.text('label'), findsOneWidget);
    expect(find.byType(Icon), findsNothing);

    // Verify that the widget's height is 48 and that its internal
    /// horizontal layout is: 20 label 20
    expect(tester.getSize(fabFinder).height, 48.0);

    final double fabLeft = tester.getTopLeft(fabFinder).dx;
    final double fabRight = tester.getTopRight(fabFinder).dx;
    final double labelLeft = tester.getTopLeft(find.text('label')).dx;
    final double labelRight = tester.getTopRight(find.text('label')).dx;
    expect(labelLeft - fabLeft, 20.0);
    expect(fabRight - labelRight, 20.0);

    // The overall width of the button is:
    // 140 = 20 + 100(label) + 20
    expect(tester.getSize(find.text('label')).width, 100.0);
    expect(tester.getSize(fabFinder).width, 140);
  });

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  testWidgets('Floating Action Button heroTag', (WidgetTester tester) async {
    BuildContext theContext;
    await tester.pumpWidget(
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      MaterialApp(
        home: Scaffold(
          body: Builder(
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            builder: (BuildContext context) {
              theContext = context;
              return const FloatingActionButton(heroTag: 1, onPressed: null);
            },
          ),
          floatingActionButton: const FloatingActionButton(heroTag: 2, onPressed: null),
        ),
      ),
    );
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    Navigator.push(theContext, PageRouteBuilder<void>(
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      pageBuilder: (BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation) {
        return const Placeholder();
      },
    ));
    await tester.pump(); // this would fail if heroTag was the same on both FloatingActionButtons (see below).
  });

  testWidgets('Floating Action Button heroTag - with duplicate', (WidgetTester tester) async {
    BuildContext theContext;
    await tester.pumpWidget(
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      MaterialApp(
        home: Scaffold(
          body: Builder(
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            builder: (BuildContext context) {
              theContext = context;
              return const FloatingActionButton(onPressed: null);
            },
          ),
          floatingActionButton: const FloatingActionButton(onPressed: null),
        ),
      ),
    );
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    Navigator.push(theContext, PageRouteBuilder<void>(
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      pageBuilder: (BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation) {
        return const Placeholder();
      },
    ));
    await tester.pump();
    expect(tester.takeException().toString(), contains('FloatingActionButton'));
  });

  testWidgets('Floating Action Button heroTag - with duplicate', (WidgetTester tester) async {
    BuildContext theContext;
    await tester.pumpWidget(
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      MaterialApp(
        home: Scaffold(
          body: Builder(
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            builder: (BuildContext context) {
              theContext = context;
              return const FloatingActionButton(heroTag: 'xyzzy', onPressed: null);
            },
          ),
          floatingActionButton: const FloatingActionButton(heroTag: 'xyzzy', onPressed: null),
        ),
      ),
    );
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    Navigator.push(theContext, PageRouteBuilder<void>(
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      pageBuilder: (BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation) {
        return const Placeholder();
      },
    ));
    await tester.pump();
    expect(tester.takeException().toString(), contains('xyzzy'));
  });
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  testWidgets('Floating Action Button semantics (enabled)', (WidgetTester tester) async {
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    final SemanticsTester semantics = SemanticsTester(tester);
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    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
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        child: Center(
          child: FloatingActionButton(
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            onPressed: () { },
            child: const Icon(Icons.add, semanticLabel: 'Add'),
          ),
        ),
      ),
    );

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    expect(semantics, hasSemantics(TestSemantics.root(
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      children: <TestSemantics>[
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        TestSemantics.rootChild(
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          label: 'Add',
          flags: <SemanticsFlag>[
            SemanticsFlag.hasEnabledState,
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            SemanticsFlag.isButton,
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            SemanticsFlag.isEnabled,
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            SemanticsFlag.isFocusable,
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          ],
          actions: <SemanticsAction>[
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            SemanticsAction.tap,
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          ],
        ),
      ],
    ), ignoreTransform: true, ignoreId: true, ignoreRect: true));

    semantics.dispose();
  });

  testWidgets('Floating Action Button semantics (disabled)', (WidgetTester tester) async {
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    final SemanticsTester semantics = SemanticsTester(tester);
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    await tester.pumpWidget(
      const Directionality(
        textDirection: TextDirection.ltr,
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        child: Center(
          child: FloatingActionButton(
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            onPressed: null,
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            child: Icon(Icons.add, semanticLabel: 'Add'),
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          ),
        ),
      ),
    );

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    expect(semantics, hasSemantics(TestSemantics.root(
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      children: <TestSemantics>[
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        TestSemantics.rootChild(
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          label: 'Add',
          flags: <SemanticsFlag>[
            SemanticsFlag.isButton,
            SemanticsFlag.hasEnabledState,
          ],
        ),
      ],
    ), ignoreTransform: true, ignoreId: true, ignoreRect: true));

    semantics.dispose();
  });
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  testWidgets('Tooltip is used as semantics label', (WidgetTester tester) async {
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    final SemanticsTester semantics = SemanticsTester(tester);
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    await tester.pumpWidget(
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      MaterialApp(
        home: Scaffold(
          floatingActionButton: FloatingActionButton(
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            onPressed: () { },
            tooltip: 'Add Photo',
            child: const Icon(Icons.add_a_photo),
          ),
        ),
      ),
    );

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    expect(semantics, hasSemantics(TestSemantics.root(
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      children: <TestSemantics>[
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        TestSemantics.rootChild(
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          children: <TestSemantics>[
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            TestSemantics(
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              flags: <SemanticsFlag>[
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                SemanticsFlag.scopesRoute,
              ],
              children: <TestSemantics>[
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                TestSemantics(
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                  label: 'Add Photo',
                  actions: <SemanticsAction>[
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                    SemanticsAction.tap,
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                  ],
                  flags: <SemanticsFlag>[
                    SemanticsFlag.hasEnabledState,
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                    SemanticsFlag.isButton,
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                    SemanticsFlag.isEnabled,
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                    SemanticsFlag.isFocusable,
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                  ],
                ),
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              ],
            ),
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          ],
        ),
      ],
    ), ignoreTransform: true, ignoreId: true, ignoreRect: true));

    semantics.dispose();
  });

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  testWidgets('extended FAB hero transitions succeed', (WidgetTester tester) async {
    // Regression test for https://github.com/flutter/flutter/issues/18782
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    await tester.pumpWidget(
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      MaterialApp(
        home: Scaffold(
          floatingActionButton: Builder(
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            builder: (BuildContext context) { // define context of Navigator.push()
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              return FloatingActionButton.extended(
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                icon: const Icon(Icons.add),
                label: const Text('A long FAB label'),
                onPressed: () {
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                  Navigator.push(context, MaterialPageRoute<void>(
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                    builder: (BuildContext context) {
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                      return Scaffold(
                        floatingActionButton: FloatingActionButton.extended(
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                          icon: const Icon(Icons.add),
                          label: const Text('X'),
                          onPressed: () { },
                        ),
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                        body: Center(
                          child: RaisedButton(
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                            child: const Text('POP'),
                            onPressed: () {
                              Navigator.pop(context);
                            },
                          ),
                        ),
                      );
                    },
                  ));
                },
              );
            },
          ),
          body: const Center(
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            child: Text('Hello World'),
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          ),
        ),
      ),
    );

    final Finder longFAB = find.text('A long FAB label');
    final Finder shortFAB = find.text('X');
    final Finder helloWorld = find.text('Hello World');

    expect(longFAB, findsOneWidget);
    expect(shortFAB, findsNothing);
    expect(helloWorld, findsOneWidget);

    await tester.tap(longFAB);
    await tester.pumpAndSettle();

    expect(shortFAB, findsOneWidget);
    expect(longFAB, findsNothing);

    // Trigger a hero transition from shortFAB to longFAB.
    await tester.tap(find.text('POP'));
    await tester.pumpAndSettle();

    expect(longFAB, findsOneWidget);
    expect(shortFAB, findsNothing);
    expect(helloWorld, findsOneWidget);
  });
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  // This test prevents https://github.com/flutter/flutter/issues/20483
  testWidgets('Floating Action Button clips ink splash and highlight', (WidgetTester tester) async {
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    final GlobalKey key = GlobalKey();
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    await tester.pumpWidget(
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      MaterialApp(
        home: Scaffold(
          body: Center(
            child: RepaintBoundary(
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              key: key,
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              child: FloatingActionButton(
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                onPressed: () { },
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                child: const Icon(Icons.add),
              ),
            ),
          ),
        ),
      ),
    );

    await tester.press(find.byKey(key));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 1000));
    await expectLater(
      find.byKey(key),
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      matchesGoldenFile('floating_action_button_test.clip.png'),
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    );
  });
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  testWidgets('Floating Action Button has no clip by default', (WidgetTester tester) async {
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    final FocusNode focusNode = FocusNode();
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    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
        child: Material(
          child: FloatingActionButton(
            focusNode: focusNode,
            onPressed: () { /* to make sure the button is enabled */ },
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          ),
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        ),
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      ),
    );

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    focusNode.unfocus();
    await tester.pump();

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    expect(
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      tester.renderObject(find.byType(FloatingActionButton)),
      paintsExactlyCountTimes(#clipPath, 0),
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    );
  });
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  testWidgets('Can find FloatingActionButton semantics', (WidgetTester tester) async {
    await tester.pumpWidget(MaterialApp(
      home: FloatingActionButton(onPressed: () {}),
    ));

    expect(
      tester.getSemantics(find.byType(FloatingActionButton)),
      matchesSemantics(
        hasTapAction: true,
        hasEnabledState: true,
        isButton: true,
        isEnabled: true,
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        isFocusable: true,
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      ),
    );
  }, semanticsEnabled: true);
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  testWidgets('Foreground color applies to icon on fab', (WidgetTester tester) async {
    const Color foregroundColor = Color(0xcafefeed);

    await tester.pumpWidget(MaterialApp(
      home: FloatingActionButton(
        onPressed: () {},
        foregroundColor: foregroundColor,
        child: const Icon(Icons.access_alarm),
      ),
    ));

    final RichText iconRichText = tester.widget<RichText>(
      find.descendant(of: find.byIcon(Icons.access_alarm), matching: find.byType(RichText)),
    );
    expect(iconRichText.text.style.color, foregroundColor);
  });
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  testWidgets('FloatingActionButton uses custom splash color', (WidgetTester tester) async {
    const Color splashColor = Color(0xcafefeed);

    await tester.pumpWidget(MaterialApp(
      home: FloatingActionButton(
        onPressed: () {},
        splashColor: splashColor,
        child: const Icon(Icons.access_alarm),
      ),
    ));

    await tester.press(find.byType(FloatingActionButton));
    await tester.pumpAndSettle();

    expect(
      find.byType(FloatingActionButton),
      paints..circle(color: splashColor),
    );
  });
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}
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Offset _rightEdgeOfFab(WidgetTester tester) {
  final Finder fab = find.byType(FloatingActionButton);
  return tester.getRect(fab).centerRight - const Offset(1.0, 0.0);
}