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Issue 10836241: Move unittest from lib to pkg. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 8 years, 4 months ago
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1 // Copyright (c) 2012, 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 /**
6 * MatchState is a simple wrapper around an arbitrary object.
7 * [Matcher] [matches] methods can use this to store useful
8 * information upon match failures, and this information will
9 * be passed to [describeMismatch]. Each [Matcher] is responsible
10 * for its own use of this state, so the state created by [matches]
11 * should be consistent with that expected by [describeMismatch] in
12 * the same [Matcher] class, but can vary between classes. The inner
13 * state, if set, will typically be a [Map] with a number of key-value
14 * pairs containing relevant state information.
15 */
16 class MatchState {
17 var state = null;
18
19 MatchState([this.state]);
20 }
21
22 /**
23 * BaseMatcher is the base class for all matchers. To implement a new
24 * matcher, either add a class that implements from IMatcher or
25 * a class that inherits from Matcher. Inheriting from Matcher has
26 * the benefit that a default implementation of describeMismatch will
27 * be provided.
28 */
29 class BaseMatcher implements Matcher {
30 const BaseMatcher();
31
32 /**
33 * Tests the matcher against a given [item]
34 * and return true if the match succeeds; false otherwise.
35 * [matchState] may be used to return additional info for
36 * the use of [describeMismatch].
37 */
38 abstract bool matches(item, MatchState matchState);
39
40 /**
41 * Creates a textual description of a matcher,
42 * by appending to [mismatchDescription].
43 */
44 abstract Description describe(Description mismatchDescription);
45
46 /**
47 * Generates a description of the matcher failed for a particular
48 * [item], by appending the description to [mismatchDescription].
49 * It does not check whether the [item] fails the match, as it is
50 * only called after a failed match. There may be additional info
51 * about the mismatch in [matchState].
52 */
53 Description describeMismatch(item, Description mismatchDescription,
54 MatchState matchState, bool verbose) =>
55 mismatchDescription.add('was ').addDescriptionOf(item);
56 }
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