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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 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 | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 /** | 5 /** |
6 * This library contains an Expect class with static methods that can be used | 6 * This library contains an Expect class with static methods that can be used |
7 * for simple unit-tests. | 7 * for simple unit-tests. |
8 */ | 8 */ |
9 library expect; | 9 library expect; |
10 | 10 |
11 /** | 11 /** |
12 * Expect is used for tests that do not want to make use of the | 12 * Expect is used for tests that do not want to make use of the |
13 * Dart unit test library - for example, the core language tests. | 13 * Dart unit test library - for example, the core language tests. |
14 * Third parties are discouraged from using this, and should use | 14 * Third parties are discouraged from using this, and should use |
15 * the expect() function in the unit test library instead for | 15 * the expect() function in the unit test library instead for |
16 * test assertions. | 16 * test assertions. |
17 */ | 17 */ |
18 class Expect { | 18 class Expect { |
19 static String _truncateString(String string, int start, int end, int length) { | |
floitsch
2013/05/30 12:13:48
make this a separate CL?
floitsch
2013/05/30 12:13:48
comment.
Lasse Reichstein Nielsen
2013/05/31 05:51:59
Done.
Lasse Reichstein Nielsen
2013/05/31 05:51:59
Rather not. It's just a tweak that happened as par
| |
20 if (end - start > length) { | |
21 end = start + length; | |
22 } else if (end - start < length) { | |
23 int overflow = length - (end - start); | |
24 if (overflow > 10) overflow = 10; | |
25 // Add context. | |
26 start = start - ((overflow + 1) >> 1); | |
floitsch
2013/05/30 12:13:48
~/ 2.
let the VM optimize this.
Lasse Reichstein Nielsen
2013/05/31 05:51:59
Done.
Lasse Reichstein Nielsen
2013/05/31 05:51:59
Done.
| |
27 end = end + (overflow >> 1); | |
28 if (start < 0) start = 0; | |
29 if (end > string.length) end = string.length; | |
30 } | |
31 if (start == 0 && end == string.length) return string; | |
32 StringBuffer buf = new StringBuffer(); | |
33 if (start > 0) buf.write("..."); | |
34 for (int i = start; i < end; i++) { | |
35 int code = string.codeUnitAt(i); | |
36 if (code < 0x20) { | |
37 buf.write(r"\x"); | |
38 buf.write("0123456789abcdef"[code >> 4]); | |
floitsch
2013/05/30 12:13:48
~/ 16
Lasse Reichstein Nielsen
2013/05/31 05:51:59
Done.
| |
39 buf.write("0123456789abcdef"[code & 0x0f]); | |
floitsch
2013/05/30 12:13:48
% 16
Lasse Reichstein Nielsen
2013/05/31 05:51:59
Done.
| |
40 } else { | |
41 buf.writeCharCode(string.codeUnitAt(i)); | |
42 } | |
43 } | |
44 if (end < string.length) buf.write("..."); | |
45 return buf.toString(); | |
46 } | |
47 | |
48 static String _stringDifference(String expected, String actual) { | |
49 if (expected.length < 20 && actual.length < 20) return null; | |
50 for (int i = 0; i < expected.length && i < actual.length; i++) { | |
51 if (expected.codeUnitAt(i) != actual.codeUnitAt(i)) { | |
52 int start = i; | |
53 i++; | |
54 while (i < expected.length && i < actual.length) { | |
55 if (expected.codeUnitAt(i) == actual.codeUnitAt(i)) break; | |
56 } | |
57 int end = i; | |
58 var truncExpected = _truncateString(expected, start, end, 20); | |
59 var truncActual = _truncateString(actual, start, end, 20); | |
60 return "at index $start: Expected <$truncExpected>, " | |
61 "Found: <$truncActual>"; | |
62 } | |
63 } | |
64 return null; | |
65 } | |
66 | |
19 /** | 67 /** |
20 * Checks whether the expected and actual values are equal (using `==`). | 68 * Checks whether the expected and actual values are equal (using `==`). |
21 */ | 69 */ |
22 static void equals(var expected, var actual, [String reason = null]) { | 70 static void equals(var expected, var actual, [String reason = null]) { |
23 if (expected == actual) return; | 71 if (expected == actual) return; |
24 String msg = _getMessage(reason); | 72 String msg = _getMessage(reason); |
73 stringSpecialCase: | |
74 if (expected is String && actual is String) { | |
75 String stringDifference = _stringDifference(expected, actual); | |
76 if (stringDifference != null) { | |
77 _fail("Expect.equals($stringDifference$msg) fails."); | |
78 } | |
79 } | |
25 _fail("Expect.equals(expected: <$expected>, actual: <$actual>$msg) fails."); | 80 _fail("Expect.equals(expected: <$expected>, actual: <$actual>$msg) fails."); |
26 } | 81 } |
27 | 82 |
28 /** | 83 /** |
29 * Checks whether the actual value is a bool and its value is true. | 84 * Checks whether the actual value is a bool and its value is true. |
30 */ | 85 */ |
31 static void isTrue(var actual, [String reason = null]) { | 86 static void isTrue(var actual, [String reason = null]) { |
32 if (_identical(actual, true)) return; | 87 if (_identical(actual, true)) return; |
33 String msg = _getMessage(reason); | 88 String msg = _getMessage(reason); |
34 _fail("Expect.isTrue($actual$msg) fails."); | 89 _fail("Expect.isTrue($actual$msg) fails."); |
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294 | 349 |
295 bool _identical(a, b) => identical(a, b); | 350 bool _identical(a, b) => identical(a, b); |
296 | 351 |
297 typedef bool _CheckExceptionFn(exception); | 352 typedef bool _CheckExceptionFn(exception); |
298 | 353 |
299 class ExpectException implements Exception { | 354 class ExpectException implements Exception { |
300 ExpectException(this.message); | 355 ExpectException(this.message); |
301 String toString() => message; | 356 String toString() => message; |
302 String message; | 357 String message; |
303 } | 358 } |
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