summaryrefslogtreecommitdiff
path: root/vendor/github.com/onsi/gomega/matchers.go
blob: 16218d4c52178ecaf71e94d25b5942b3200c22ca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
package gomega

import (
	"time"

	"github.com/onsi/gomega/matchers"
	"github.com/onsi/gomega/types"
)

//Equal uses reflect.DeepEqual to compare actual with expected.  Equal is strict about
//types when performing comparisons.
//It is an error for both actual and expected to be nil.  Use BeNil() instead.
func Equal(expected interface{}) types.GomegaMatcher {
	return &matchers.EqualMatcher{
		Expected: expected,
	}
}

//BeEquivalentTo is more lax than Equal, allowing equality between different types.
//This is done by converting actual to have the type of expected before
//attempting equality with reflect.DeepEqual.
//It is an error for actual and expected to be nil.  Use BeNil() instead.
func BeEquivalentTo(expected interface{}) types.GomegaMatcher {
	return &matchers.BeEquivalentToMatcher{
		Expected: expected,
	}
}

//BeIdenticalTo uses the == operator to compare actual with expected.
//BeIdenticalTo is strict about types when performing comparisons.
//It is an error for both actual and expected to be nil.  Use BeNil() instead.
func BeIdenticalTo(expected interface{}) types.GomegaMatcher {
	return &matchers.BeIdenticalToMatcher{
		Expected: expected,
	}
}

//BeNil succeeds if actual is nil
func BeNil() types.GomegaMatcher {
	return &matchers.BeNilMatcher{}
}

//BeTrue succeeds if actual is true
func BeTrue() types.GomegaMatcher {
	return &matchers.BeTrueMatcher{}
}

//BeFalse succeeds if actual is false
func BeFalse() types.GomegaMatcher {
	return &matchers.BeFalseMatcher{}
}

//HaveOccurred succeeds if actual is a non-nil error
//The typical Go error checking pattern looks like:
//    err := SomethingThatMightFail()
//    Expect(err).ShouldNot(HaveOccurred())
func HaveOccurred() types.GomegaMatcher {
	return &matchers.HaveOccurredMatcher{}
}

//Succeed passes if actual is a nil error
//Succeed is intended to be used with functions that return a single error value. Instead of
//    err := SomethingThatMightFail()
//    Expect(err).ShouldNot(HaveOccurred())
//
//You can write:
//    Expect(SomethingThatMightFail()).Should(Succeed())
//
//It is a mistake to use Succeed with a function that has multiple return values.  Gomega's Ω and Expect
//functions automatically trigger failure if any return values after the first return value are non-zero/non-nil.
//This means that Ω(MultiReturnFunc()).ShouldNot(Succeed()) can never pass.
func Succeed() types.GomegaMatcher {
	return &matchers.SucceedMatcher{}
}

//MatchError succeeds if actual is a non-nil error that matches the passed in string/error.
//
//These are valid use-cases:
//  Expect(err).Should(MatchError("an error")) //asserts that err.Error() == "an error"
//  Expect(err).Should(MatchError(SomeError)) //asserts that err == SomeError (via reflect.DeepEqual)
//
//It is an error for err to be nil or an object that does not implement the Error interface
func MatchError(expected interface{}) types.GomegaMatcher {
	return &matchers.MatchErrorMatcher{
		Expected: expected,
	}
}

//BeClosed succeeds if actual is a closed channel.
//It is an error to pass a non-channel to BeClosed, it is also an error to pass nil
//
//In order to check whether or not the channel is closed, Gomega must try to read from the channel
//(even in the `ShouldNot(BeClosed())` case).  You should keep this in mind if you wish to make subsequent assertions about
//values coming down the channel.
//
//Also, if you are testing that a *buffered* channel is closed you must first read all values out of the channel before
//asserting that it is closed (it is not possible to detect that a buffered-channel has been closed until all its buffered values are read).
//
//Finally, as a corollary: it is an error to check whether or not a send-only channel is closed.
func BeClosed() types.GomegaMatcher {
	return &matchers.BeClosedMatcher{}
}

//Receive succeeds if there is a value to be received on actual.
//Actual must be a channel (and cannot be a send-only channel) -- anything else is an error.
//
//Receive returns immediately and never blocks:
//
//- If there is nothing on the channel `c` then Expect(c).Should(Receive()) will fail and Ω(c).ShouldNot(Receive()) will pass.
//
//- If the channel `c` is closed then Expect(c).Should(Receive()) will fail and Ω(c).ShouldNot(Receive()) will pass.
//
//- If there is something on the channel `c` ready to be read, then Expect(c).Should(Receive()) will pass and Ω(c).ShouldNot(Receive()) will fail.
//
//If you have a go-routine running in the background that will write to channel `c` you can:
//    Eventually(c).Should(Receive())
//
//This will timeout if nothing gets sent to `c` (you can modify the timeout interval as you normally do with `Eventually`)
//
//A similar use-case is to assert that no go-routine writes to a channel (for a period of time).  You can do this with `Consistently`:
//    Consistently(c).ShouldNot(Receive())
//
//You can pass `Receive` a matcher.  If you do so, it will match the received object against the matcher.  For example:
//    Expect(c).Should(Receive(Equal("foo")))
//
//When given a matcher, `Receive` will always fail if there is nothing to be received on the channel.
//
//Passing Receive a matcher is especially useful when paired with Eventually:
//
//    Eventually(c).Should(Receive(ContainSubstring("bar")))
//
//will repeatedly attempt to pull values out of `c` until a value matching "bar" is received.
//
//Finally, if you want to have a reference to the value *sent* to the channel you can pass the `Receive` matcher a pointer to a variable of the appropriate type:
//    var myThing thing
//    Eventually(thingChan).Should(Receive(&myThing))
//    Expect(myThing.Sprocket).Should(Equal("foo"))
//    Expect(myThing.IsValid()).Should(BeTrue())
func Receive(args ...interface{}) types.GomegaMatcher {
	var arg interface{}
	if len(args) > 0 {
		arg = args[0]
	}

	return &matchers.ReceiveMatcher{
		Arg: arg,
	}
}

//BeSent succeeds if a value can be sent to actual.
//Actual must be a channel (and cannot be a receive-only channel) that can sent the type of the value passed into BeSent -- anything else is an error.
//In addition, actual must not be closed.
//
//BeSent never blocks:
//
//- If the channel `c` is not ready to receive then Expect(c).Should(BeSent("foo")) will fail immediately
//- If the channel `c` is eventually ready to receive then Eventually(c).Should(BeSent("foo")) will succeed.. presuming the channel becomes ready to receive  before Eventually's timeout
//- If the channel `c` is closed then Expect(c).Should(BeSent("foo")) and Ω(c).ShouldNot(BeSent("foo")) will both fail immediately
//
//Of course, the value is actually sent to the channel.  The point of `BeSent` is less to make an assertion about the availability of the channel (which is typically an implementation detail that your test should not be concerned with).
//Rather, the point of `BeSent` is to make it possible to easily and expressively write tests that can timeout on blocked channel sends.
func BeSent(arg interface{}) types.GomegaMatcher {
	return &matchers.BeSentMatcher{
		Arg: arg,
	}
}

//MatchRegexp succeeds if actual is a string or stringer that matches the
//passed-in regexp.  Optional arguments can be provided to construct a regexp
//via fmt.Sprintf().
func MatchRegexp(regexp string, args ...interface{}) types.GomegaMatcher {
	return &matchers.MatchRegexpMatcher{
		Regexp: regexp,
		Args:   args,
	}
}

//ContainSubstring succeeds if actual is a string or stringer that contains the
//passed-in substring.  Optional arguments can be provided to construct the substring
//via fmt.Sprintf().
func ContainSubstring(substr string, args ...interface{}) types.GomegaMatcher {
	return &matchers.ContainSubstringMatcher{
		Substr: substr,
		Args:   args,
	}
}

//HavePrefix succeeds if actual is a string or stringer that contains the
//passed-in string as a prefix.  Optional arguments can be provided to construct
//via fmt.Sprintf().
func HavePrefix(prefix string, args ...interface{}) types.GomegaMatcher {
	return &matchers.HavePrefixMatcher{
		Prefix: prefix,
		Args:   args,
	}
}

//HaveSuffix succeeds if actual is a string or stringer that contains the
//passed-in string as a suffix.  Optional arguments can be provided to construct
//via fmt.Sprintf().
func HaveSuffix(suffix string, args ...interface{}) types.GomegaMatcher {
	return &matchers.HaveSuffixMatcher{
		Suffix: suffix,
		Args:   args,
	}
}

//MatchJSON succeeds if actual is a string or stringer of JSON that matches
//the expected JSON.  The JSONs are decoded and the resulting objects are compared via
//reflect.DeepEqual so things like key-ordering and whitespace shouldn't matter.
func MatchJSON(json interface{}) types.GomegaMatcher {
	return &matchers.MatchJSONMatcher{
		JSONToMatch: json,
	}
}

//MatchXML succeeds if actual is a string or stringer of XML that matches
//the expected XML.  The XMLs are decoded and the resulting objects are compared via
//reflect.DeepEqual so things like whitespaces shouldn't matter.
func MatchXML(xml interface{}) types.GomegaMatcher {
	return &matchers.MatchXMLMatcher{
		XMLToMatch: xml,
	}
}

//MatchYAML succeeds if actual is a string or stringer of YAML that matches
//the expected YAML.  The YAML's are decoded and the resulting objects are compared via
//reflect.DeepEqual so things like key-ordering and whitespace shouldn't matter.
func MatchYAML(yaml interface{}) types.GomegaMatcher {
	return &matchers.MatchYAMLMatcher{
		YAMLToMatch: yaml,
	}
}

//BeEmpty succeeds if actual is empty.  Actual must be of type string, array, map, chan, or slice.
func BeEmpty() types.GomegaMatcher {
	return &matchers.BeEmptyMatcher{}
}

//HaveLen succeeds if actual has the passed-in length.  Actual must be of type string, array, map, chan, or slice.
func HaveLen(count int) types.GomegaMatcher {
	return &matchers.HaveLenMatcher{
		Count: count,
	}
}

//HaveCap succeeds if actual has the passed-in capacity.  Actual must be of type array, chan, or slice.
func HaveCap(count int) types.GomegaMatcher {
	return &matchers.HaveCapMatcher{
		Count: count,
	}
}

//BeZero succeeds if actual is the zero value for its type or if actual is nil.
func BeZero() types.GomegaMatcher {
	return &matchers.BeZeroMatcher{}
}

//ContainElement succeeds if actual contains the passed in element.
//By default ContainElement() uses Equal() to perform the match, however a
//matcher can be passed in instead:
//    Expect([]string{"Foo", "FooBar"}).Should(ContainElement(ContainSubstring("Bar")))
//
//Actual must be an array, slice or map.
//For maps, ContainElement searches through the map's values.
func ContainElement(element interface{}) types.GomegaMatcher {
	return &matchers.ContainElementMatcher{
		Element: element,
	}
}

//BeElementOf succeeds if actual is contained in the passed in elements.
//BeElementOf() always uses Equal() to perform the match.
//When the passed in elements are comprised of a single element that is either an Array or Slice, BeElementOf() behaves
//as the reverse of ContainElement() that operates with Equal() to perform the match.
//    Expect(2).Should(BeElementOf([]int{1, 2}))
//    Expect(2).Should(BeElementOf([2]int{1, 2}))
//Otherwise, BeElementOf() provides a syntactic sugar for Or(Equal(_), Equal(_), ...):
//    Expect(2).Should(BeElementOf(1, 2))
//
//Actual must be typed.
func BeElementOf(elements ...interface{}) types.GomegaMatcher {
	return &matchers.BeElementOfMatcher{
		Elements: elements,
	}
}

//ConsistOf succeeds if actual contains precisely the elements passed into the matcher.  The ordering of the elements does not matter.
//By default ConsistOf() uses Equal() to match the elements, however custom matchers can be passed in instead.  Here are some examples:
//
//    Expect([]string{"Foo", "FooBar"}).Should(ConsistOf("FooBar", "Foo"))
//    Expect([]string{"Foo", "FooBar"}).Should(ConsistOf(ContainSubstring("Bar"), "Foo"))
//    Expect([]string{"Foo", "FooBar"}).Should(ConsistOf(ContainSubstring("Foo"), ContainSubstring("Foo")))
//
//Actual must be an array, slice or map.  For maps, ConsistOf matches against the map's values.
//
//You typically pass variadic arguments to ConsistOf (as in the examples above).  However, if you need to pass in a slice you can provided that it
//is the only element passed in to ConsistOf:
//
//    Expect([]string{"Foo", "FooBar"}).Should(ConsistOf([]string{"FooBar", "Foo"}))
//
//Note that Go's type system does not allow you to write this as ConsistOf([]string{"FooBar", "Foo"}...) as []string and []interface{} are different types - hence the need for this special rule.
func ConsistOf(elements ...interface{}) types.GomegaMatcher {
	return &matchers.ConsistOfMatcher{
		Elements: elements,
	}
}

//ContainElements succeeds if actual contains the passed in elements. The ordering of the elements does not matter.
//By default ContainElements() uses Equal() to match the elements, however custom matchers can be passed in instead. Here are some examples:
//
//    Expect([]string{"Foo", "FooBar"}).Should(ContainElements("FooBar"))
//    Expect([]string{"Foo", "FooBar"}).Should(ContainElements(ContainSubstring("Bar"), "Foo"))
//
//Actual must be an array, slice or map.
//For maps, ContainElements searches through the map's values.
func ContainElements(elements ...interface{}) types.GomegaMatcher {
	return &matchers.ContainElementsMatcher{
		Elements: elements,
	}
}

//HaveKey succeeds if actual is a map with the passed in key.
//By default HaveKey uses Equal() to perform the match, however a
//matcher can be passed in instead:
//    Expect(map[string]string{"Foo": "Bar", "BazFoo": "Duck"}).Should(HaveKey(MatchRegexp(`.+Foo$`)))
func HaveKey(key interface{}) types.GomegaMatcher {
	return &matchers.HaveKeyMatcher{
		Key: key,
	}
}

//HaveKeyWithValue succeeds if actual is a map with the passed in key and value.
//By default HaveKeyWithValue uses Equal() to perform the match, however a
//matcher can be passed in instead:
//    Expect(map[string]string{"Foo": "Bar", "BazFoo": "Duck"}).Should(HaveKeyWithValue("Foo", "Bar"))
//    Expect(map[string]string{"Foo": "Bar", "BazFoo": "Duck"}).Should(HaveKeyWithValue(MatchRegexp(`.+Foo$`), "Bar"))
func HaveKeyWithValue(key interface{}, value interface{}) types.GomegaMatcher {
	return &matchers.HaveKeyWithValueMatcher{
		Key:   key,
		Value: value,
	}
}

//BeNumerically performs numerical assertions in a type-agnostic way.
//Actual and expected should be numbers, though the specific type of
//number is irrelevant (float32, float64, uint8, etc...).
//
//There are six, self-explanatory, supported comparators:
//    Expect(1.0).Should(BeNumerically("==", 1))
//    Expect(1.0).Should(BeNumerically("~", 0.999, 0.01))
//    Expect(1.0).Should(BeNumerically(">", 0.9))
//    Expect(1.0).Should(BeNumerically(">=", 1.0))
//    Expect(1.0).Should(BeNumerically("<", 3))
//    Expect(1.0).Should(BeNumerically("<=", 1.0))
func BeNumerically(comparator string, compareTo ...interface{}) types.GomegaMatcher {
	return &matchers.BeNumericallyMatcher{
		Comparator: comparator,
		CompareTo:  compareTo,
	}
}

//BeTemporally compares time.Time's like BeNumerically
//Actual and expected must be time.Time. The comparators are the same as for BeNumerically
//    Expect(time.Now()).Should(BeTemporally(">", time.Time{}))
//    Expect(time.Now()).Should(BeTemporally("~", time.Now(), time.Second))
func BeTemporally(comparator string, compareTo time.Time, threshold ...time.Duration) types.GomegaMatcher {
	return &matchers.BeTemporallyMatcher{
		Comparator: comparator,
		CompareTo:  compareTo,
		Threshold:  threshold,
	}
}

//BeAssignableToTypeOf succeeds if actual is assignable to the type of expected.
//It will return an error when one of the values is nil.
//    Expect(0).Should(BeAssignableToTypeOf(0))         // Same values
//    Expect(5).Should(BeAssignableToTypeOf(-1))        // different values same type
//    Expect("foo").Should(BeAssignableToTypeOf("bar")) // different values same type
//    Expect(struct{ Foo string }{}).Should(BeAssignableToTypeOf(struct{ Foo string }{}))
func BeAssignableToTypeOf(expected interface{}) types.GomegaMatcher {
	return &matchers.AssignableToTypeOfMatcher{
		Expected: expected,
	}
}

//Panic succeeds if actual is a function that, when invoked, panics.
//Actual must be a function that takes no arguments and returns no results.
func Panic() types.GomegaMatcher {
	return &matchers.PanicMatcher{}
}

//PanicWith succeeds if actual is a function that, when invoked, panics with a specific value.
//Actual must be a function that takes no arguments and returns no results.
//
//By default PanicWith uses Equal() to perform the match, however a
//matcher can be passed in instead:
//    Expect(fn).Should(PanicWith(MatchRegexp(`.+Foo$`)))
func PanicWith(expected interface{}) types.GomegaMatcher {
	return &matchers.PanicMatcher{Expected: expected}
}

//BeAnExistingFile succeeds if a file exists.
//Actual must be a string representing the abs path to the file being checked.
func BeAnExistingFile() types.GomegaMatcher {
	return &matchers.BeAnExistingFileMatcher{}
}

//BeARegularFile succeeds if a file exists and is a regular file.
//Actual must be a string representing the abs path to the file being checked.
func BeARegularFile() types.GomegaMatcher {
	return &matchers.BeARegularFileMatcher{}
}

//BeADirectory succeeds if a file exists and is a directory.
//Actual must be a string representing the abs path to the file being checked.
func BeADirectory() types.GomegaMatcher {
	return &matchers.BeADirectoryMatcher{}
}

//HaveHTTPStatus succeeds if the Status or StatusCode field of an HTTP response matches.
//Actual must be either a *http.Response or *httptest.ResponseRecorder.
//Expected must be either an int or a string.
//  Expect(resp).Should(HaveHTTPStatus(http.StatusOK))   // asserts that resp.StatusCode == 200
//  Expect(resp).Should(HaveHTTPStatus("404 Not Found")) // asserts that resp.Status == "404 Not Found"
func HaveHTTPStatus(expected interface{}) types.GomegaMatcher {
	return &matchers.HaveHTTPStatusMatcher{Expected: expected}
}

//And succeeds only if all of the given matchers succeed.
//The matchers are tried in order, and will fail-fast if one doesn't succeed.
//  Expect("hi").To(And(HaveLen(2), Equal("hi"))
//
//And(), Or(), Not() and WithTransform() allow matchers to be composed into complex expressions.
func And(ms ...types.GomegaMatcher) types.GomegaMatcher {
	return &matchers.AndMatcher{Matchers: ms}
}

//SatisfyAll is an alias for And().
//  Expect("hi").Should(SatisfyAll(HaveLen(2), Equal("hi")))
func SatisfyAll(matchers ...types.GomegaMatcher) types.GomegaMatcher {
	return And(matchers...)
}

//Or succeeds if any of the given matchers succeed.
//The matchers are tried in order and will return immediately upon the first successful match.
//  Expect("hi").To(Or(HaveLen(3), HaveLen(2))
//
//And(), Or(), Not() and WithTransform() allow matchers to be composed into complex expressions.
func Or(ms ...types.GomegaMatcher) types.GomegaMatcher {
	return &matchers.OrMatcher{Matchers: ms}
}

//SatisfyAny is an alias for Or().
//  Expect("hi").SatisfyAny(Or(HaveLen(3), HaveLen(2))
func SatisfyAny(matchers ...types.GomegaMatcher) types.GomegaMatcher {
	return Or(matchers...)
}

//Not negates the given matcher; it succeeds if the given matcher fails.
//  Expect(1).To(Not(Equal(2))
//
//And(), Or(), Not() and WithTransform() allow matchers to be composed into complex expressions.
func Not(matcher types.GomegaMatcher) types.GomegaMatcher {
	return &matchers.NotMatcher{Matcher: matcher}
}

//WithTransform applies the `transform` to the actual value and matches it against `matcher`.
//The given transform must be a function of one parameter that returns one value.
//  var plus1 = func(i int) int { return i + 1 }
//  Expect(1).To(WithTransform(plus1, Equal(2))
//
//And(), Or(), Not() and WithTransform() allow matchers to be composed into complex expressions.
func WithTransform(transform interface{}, matcher types.GomegaMatcher) types.GomegaMatcher {
	return matchers.NewWithTransformMatcher(transform, matcher)
}