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Issue 11301046: Restructure pkg/unittest and pkg/webdriver to follow the pub conventions. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 8 years, 1 month 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 // To decouple the reporting of errors, and allow for extensibility of
6 // matchers, we make use of some interfaces.
7
8 /**
9 * The ErrorFormatter type is used for functions that
10 * can be used to build up error reports upon [expect] failures.
11 * There is one built-in implementation ([defaultErrorFormatter])
12 * which is used by the default failure handler. If the failure handler
13 * is replaced it may be desirable to replace the [stringDescription]
14 * error formatter with another.
15 */
16
17 part of unittest;
18
19 typedef String ErrorFormatter(actual, Matcher matcher, String reason,
20 MatchState matchState, bool verbose);
21
22 /**
23 * Matchers build up their error messages by appending to
24 * Description objects. This interface is implemented by
25 * StringDescription. This interface is unlikely to need
26 * other implementations, but could be useful to replace in
27 * some cases - e.g. language conversion.
28 */
29 abstract class Description {
30 /** Change the value of the description. */
31 Description replace(String text);
32
33 /** This is used to add arbitrary text to the description. */
34 Description add(String text);
35
36 /** This is used to add a meaningful description of a value. */
37 Description addDescriptionOf(value);
38
39 /**
40 * This is used to add a description of an [Iterable] [list],
41 * with appropriate [start] and [end] markers and inter-element [separator].
42 */
43 Description addAll(String start, String separator, String end,
44 Iterable list);
45 }
46
47 /**
48 * [expect] Matchers must implement the Matcher class.
49 * The base Matcher class that implements this interface has
50 * a generic implementation of [describeMismatch] so this does
51 * not need to be provided unless a more clear description is
52 * required. The other two methods ([matches] and [describe])
53 * must always be provided as they are highly matcher-specific.
54 */
55 abstract class Matcher {
56 /**
57 * This does the matching of the actual vs expected values.
58 * [item] is the actual value. [matchState] can be supplied
59 * and may be used to add details about the mismatch that are too
60 * costly to determine in [describeMismatch].
61 */
62 bool matches(item, MatchState matchState);
63
64 /** This builds a textual description of the matcher. */
65 Description describe(Description description);
66
67 /**
68 * This builds a textual description of a specific mismatch. [item]
69 * is the value that was tested by [matches]; [matchState] is
70 * the [MatchState] that was passed to and supplemented by [matches]
71 * with additional information about the mismact, and [mismatchDescription]
72 * is the [Description] that is being built to decribe the mismatch.
73 * A few matchers make use of the [verbose] flag to provide detailed
74 * information that is not typically included but can be of help in
75 * diagnosing failures, such as stack traces.
76 */
77 Description describeMismatch(item, Description mismatchDescription,
78 MatchState matchState, bool verbose);
79 }
80
81 /**
82 * Failed matches are reported using a default IFailureHandler.
83 * The default implementation simply throws ExpectExceptions;
84 * this can be replaced by some other implementation of
85 * IFailureHandler by calling configureExpectHandler.
86 */
87 abstract class FailureHandler {
88 /** This handles failures given a textual decription */
89 void fail(String reason);
90
91 /**
92 * This handles failures given the actual [value], the [matcher]
93 * the [reason] (argument from [expect]), some additonal [matchState]
94 * generated by the [matcher], and a verbose flag which controls in
95 * some cases how much [matchState] information is used. It will use
96 * these to create a detailed error message (typically by calling
97 * an [ErrorFormatter]) and then call [fail] with this message.
98 */
99 void failMatch(actual, Matcher matcher, String reason,
100 MatchState matchState, bool verbose);
101 }
102
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