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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 library matcher.throws_matcher; | |
| 6 | |
| 7 import 'dart:async'; | |
| 8 | |
| 9 import 'expect.dart'; | |
| 10 import 'interfaces.dart'; | |
| 11 import 'util.dart'; | |
| 12 | |
| 13 /// This can be used to match two kinds of objects: | |
| 14 /// | |
| 15 /// * A [Function] that throws an exception when called. The function cannot | |
| 16 /// take any arguments. If you want to test that a function expecting | |
| 17 /// arguments throws, wrap it in another zero-argument function that calls | |
| 18 /// the one you want to test. | |
| 19 /// | |
| 20 /// * A [Future] that completes with an exception. Note that this creates an | |
| 21 /// asynchronous expectation. The call to `expect()` that includes this will | |
| 22 /// return immediately and execution will continue. Later, when the future | |
| 23 /// completes, the actual expectation will run. | |
| 24 const Matcher throws = const Throws(); | |
| 25 | |
| 26 /// This can be used to match two kinds of objects: | |
| 27 /// | |
| 28 /// * A [Function] that throws an exception when called. The function cannot | |
| 29 /// take any arguments. If you want to test that a function expecting | |
| 30 /// arguments throws, wrap it in another zero-argument function that calls | |
| 31 /// the one you want to test. | |
| 32 /// | |
| 33 /// * A [Future] that completes with an exception. Note that this creates an | |
| 34 /// asynchronous expectation. The call to `expect()` that includes this will | |
| 35 /// return immediately and execution will continue. Later, when the future | |
| 36 /// completes, the actual expectation will run. | |
| 37 /// | |
| 38 /// In both cases, when an exception is thrown, this will test that the exceptio
n | |
| 39 /// object matches [matcher]. If [matcher] is not an instance of [Matcher], it | |
| 40 /// will implicitly be treated as `equals(matcher)`. | |
| 41 Matcher throwsA(matcher) => new Throws(wrapMatcher(matcher)); | |
| 42 | |
| 43 class Throws extends Matcher { | |
| 44 final Matcher _matcher; | |
| 45 | |
| 46 const Throws([Matcher matcher]) : this._matcher = matcher; | |
| 47 | |
| 48 bool matches(item, Map matchState) { | |
| 49 if (item is! Function && item is! Future) return false; | |
| 50 if (item is Future) { | |
| 51 var done = wrapAsync((fn) => fn()); | |
| 52 | |
| 53 // Queue up an asynchronous expectation that validates when the future | |
| 54 // completes. | |
| 55 item.then((value) { | |
| 56 done(() { | |
| 57 fail("Expected future to fail, but succeeded with '$value'."); | |
| 58 }); | |
| 59 }, onError: (error, trace) { | |
| 60 done(() { | |
| 61 if (_matcher == null) return; | |
| 62 var reason; | |
| 63 if (trace != null) { | |
| 64 var stackTrace = trace.toString(); | |
| 65 stackTrace = " ${stackTrace.replaceAll("\n", "\n ")}"; | |
| 66 reason = "Actual exception trace:\n$stackTrace"; | |
| 67 } | |
| 68 expect(error, _matcher, reason: reason); | |
| 69 }); | |
| 70 }); | |
| 71 // It hasn't failed yet. | |
| 72 return true; | |
| 73 } | |
| 74 | |
| 75 try { | |
| 76 item(); | |
| 77 return false; | |
| 78 } catch (e, s) { | |
| 79 if (_matcher == null || _matcher.matches(e, matchState)) { | |
| 80 return true; | |
| 81 } else { | |
| 82 addStateInfo(matchState, {'exception': e, 'stack': s}); | |
| 83 return false; | |
| 84 } | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 Description describe(Description description) { | |
| 89 if (_matcher == null) { | |
| 90 return description.add("throws"); | |
| 91 } else { | |
| 92 return description.add('throws ').addDescriptionOf(_matcher); | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 Description describeMismatch(item, Description mismatchDescription, | |
| 97 Map matchState, | |
| 98 bool verbose) { | |
| 99 if (item is! Function && item is! Future) { | |
| 100 return mismatchDescription.add('is not a Function or Future'); | |
| 101 } else if (_matcher == null || matchState['exception'] == null) { | |
| 102 return mismatchDescription.add('did not throw'); | |
| 103 } else { | |
| 104 mismatchDescription. add('threw '). | |
| 105 addDescriptionOf(matchState['exception']); | |
| 106 if (verbose) { | |
| 107 mismatchDescription.add(' at ').add(matchState['stack'].toString()); | |
| 108 } | |
| 109 return mismatchDescription; | |
| 110 } | |
| 111 } | |
| 112 } | |
| 113 | |
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Chromium Code Reviews
Issue 807193003:
Re-apply "Remove unittest and matcher from the repo." (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart