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  • Ian Hickson's avatar
    Make it possible to run tests live on a device (#3936) · 32527017
    Ian Hickson authored 
    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.
    32527017
test_async_utils_unguarded_test.dart 620 Bytes
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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.

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

Future<Null> helperFunction(WidgetTester tester) async {
  await tester.pump();
}

void main() {
  testWidgets('TestAsyncUtils - handling unguarded async helper functions', (WidgetTester tester) async {
    debugPrint = (String message, { int wrapWidth }) { print(message); };
    helperFunction(tester);
    helperFunction(tester);
    // this should fail
  });
}

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