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This makes it possible to substitute 'flutter run' for 'flutter test'
and actually watch a test run on a device.
For any test that depends on flutter_test:
1. Remove any import of 'package:test/test.dart'.
2. Replace `testWidgets('...', (WidgetTester tester) {`
with `testWidgets('...', (WidgetTester tester) async {`
3. Add an "await" in front of calls to any of the following:
* tap()
* tapAt()
* fling()
* flingFrom()
* scroll()
* scrollAt()
* pump()
* pumpWidget()
4. Replace any calls to `tester.flushMicrotasks()` with calls to
`await tester.idle()`.
There's a guarding API that you can use, if you have particularly
complicated tests, to get better error messages. Search for
TestAsyncUtils.
96 lines
3.5 KiB
Dart
96 lines
3.5 KiB
Dart
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:test/test.dart';
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import 'rendering_tester.dart';
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class TestLayout {
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TestLayout() {
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// viewport incoming constraints are tight 800x600
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// viewport is vertical by default
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root = new RenderViewport(
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child: new RenderCustomPaint(
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painter: new TestCallbackPainter(
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onPaint: () { painted = true; }
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),
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child: child = new RenderConstrainedBox(
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additionalConstraints: new BoxConstraints.tightFor(height: 10.0, width: 10.0)
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)
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)
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);
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}
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RenderBox root;
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RenderBox child;
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bool painted = false;
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}
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void main() {
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final ViewConfiguration testConfiguration = new ViewConfiguration(
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size: const Size(800.0, 600.0),
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devicePixelRatio: 1.0
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);
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test('onscreen layout does not affect offscreen', () {
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TestLayout onscreen = new TestLayout();
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TestLayout offscreen = new TestLayout();
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expect(onscreen.child.hasSize, isFalse);
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expect(onscreen.painted, isFalse);
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expect(offscreen.child.hasSize, isFalse);
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expect(offscreen.painted, isFalse);
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// Attach the offscreen to a custom render view and owner
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RenderView renderView = new RenderView(configuration: testConfiguration);
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PipelineOwner pipelineOwner = new PipelineOwner();
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renderView.attach(pipelineOwner);
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renderView.child = offscreen.root;
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renderView.scheduleInitialFrame();
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// Lay out the onscreen in the default binding
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layout(onscreen.root, phase: EnginePhase.paint);
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expect(onscreen.child.hasSize, isTrue);
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expect(onscreen.painted, isTrue);
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expect(onscreen.child.size, equals(const Size(800.0, 10.0)));
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// Make sure the offscreen didn't get laid out
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expect(offscreen.child.hasSize, isFalse);
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expect(offscreen.painted, isFalse);
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// Now lay out the offscreen
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pipelineOwner.flushLayout();
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expect(offscreen.child.hasSize, isTrue);
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expect(offscreen.painted, isFalse);
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pipelineOwner.flushCompositingBits();
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pipelineOwner.flushPaint();
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expect(offscreen.painted, isTrue);
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});
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test('offscreen layout does not affect onscreen', () {
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TestLayout onscreen = new TestLayout();
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TestLayout offscreen = new TestLayout();
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expect(onscreen.child.hasSize, isFalse);
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expect(onscreen.painted, isFalse);
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expect(offscreen.child.hasSize, isFalse);
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expect(offscreen.painted, isFalse);
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// Attach the offscreen to a custom render view and owner
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RenderView renderView = new RenderView(configuration: testConfiguration);
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PipelineOwner pipelineOwner = new PipelineOwner();
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renderView.attach(pipelineOwner);
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renderView.child = offscreen.root;
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renderView.scheduleInitialFrame();
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// Lay out the offscreen
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pipelineOwner.flushLayout();
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expect(offscreen.child.hasSize, isTrue);
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expect(offscreen.painted, isFalse);
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pipelineOwner.flushCompositingBits();
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pipelineOwner.flushPaint();
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expect(offscreen.painted, isTrue);
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// Make sure the onscreen didn't get laid out
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expect(onscreen.child.hasSize, isFalse);
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expect(onscreen.painted, isFalse);
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// Now lay out the onscreen in the default binding
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layout(onscreen.root, phase: EnginePhase.paint);
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expect(onscreen.child.hasSize, isTrue);
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expect(onscreen.painted, isTrue);
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expect(onscreen.child.size, equals(const Size(800.0, 10.0)));
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});
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}
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