| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'dart:async'; |
| |
| import 'package:stack_trace/stack_trace.dart'; |
| import 'package:test_api/hooks.dart'; |
| import 'package:test_api/test_api.dart' show pumpEventQueue; |
| |
| import 'expect.dart'; |
| import 'future_matchers.dart'; |
| import 'util/placeholder.dart'; |
| import 'util/pretty_print.dart'; |
| |
| /// Returns a function that causes the test to fail if it's called. |
| /// |
| /// This can safely be passed in place of any callback that takes ten or fewer |
| /// positional parameters. For example: |
| /// |
| /// ``` |
| /// // Asserts that the stream never emits an event. |
| /// stream.listen(neverCalled); |
| /// ``` |
| /// |
| /// This also ensures that the test doesn't complete until a call to |
| /// [pumpEventQueue] finishes, so that the callback has a chance to be called. |
| Null Function( |
| [Object?, |
| Object?, |
| Object?, |
| Object?, |
| Object?, |
| Object?, |
| Object?, |
| Object?, |
| Object?, |
| Object?]) get neverCalled { |
| // Make sure the test stays alive long enough to call the function if it's |
| // going to. |
| expect(pumpEventQueue(), completes); |
| |
| var zone = Zone.current; |
| return ( |
| [a1 = placeholder, |
| a2 = placeholder, |
| a3 = placeholder, |
| a4 = placeholder, |
| a5 = placeholder, |
| a6 = placeholder, |
| a7 = placeholder, |
| a8 = placeholder, |
| a9 = placeholder, |
| a10 = placeholder]) { |
| var arguments = [a1, a2, a3, a4, a5, a6, a7, a8, a9, a10] |
| .where((argument) => argument != placeholder) |
| .toList(); |
| |
| zone.handleUncaughtError( |
| TestFailure( |
| 'Callback should never have been called, but it was called with' + |
| (arguments.isEmpty |
| ? ' no arguments.' |
| : ':\n${bullet(arguments.map(prettyPrint))}')), |
| zone.run(() => Chain.current())); |
| return null; |
| }; |
| } |