summaryrefslogtreecommitdiff
path: root/vendor/github.com/onsi/gomega/gomega_dsl.go
blob: 448d595da64b44c36d8892acfb337002634b13bf (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
/*
Gomega is the Ginkgo BDD-style testing framework's preferred matcher library.

The godoc documentation describes Gomega's API.  More comprehensive documentation (with examples!) is available at http://onsi.github.io/gomega/

Gomega on Github: http://github.com/onsi/gomega

Learn more about Ginkgo online: http://onsi.github.io/ginkgo

Ginkgo on Github: http://github.com/onsi/ginkgo

Gomega is MIT-Licensed
*/
package gomega

import (
	"fmt"
	"reflect"
	"time"

	"github.com/onsi/gomega/internal/assertion"
	"github.com/onsi/gomega/internal/asyncassertion"
	"github.com/onsi/gomega/internal/testingtsupport"
	"github.com/onsi/gomega/types"
)

const GOMEGA_VERSION = "1.5.0"

const nilFailHandlerPanic = `You are trying to make an assertion, but Gomega's fail handler is nil.
If you're using Ginkgo then you probably forgot to put your assertion in an It().
Alternatively, you may have forgotten to register a fail handler with RegisterFailHandler() or RegisterTestingT().
Depending on your vendoring solution you may be inadvertently importing gomega and subpackages (e.g. ghhtp, gexec,...) from different locations.
`

var globalFailWrapper *types.GomegaFailWrapper

var defaultEventuallyTimeout = time.Second
var defaultEventuallyPollingInterval = 10 * time.Millisecond
var defaultConsistentlyDuration = 100 * time.Millisecond
var defaultConsistentlyPollingInterval = 10 * time.Millisecond

// RegisterFailHandler connects Ginkgo to Gomega. When a matcher fails
// the fail handler passed into RegisterFailHandler is called.
func RegisterFailHandler(handler types.GomegaFailHandler) {
	RegisterFailHandlerWithT(testingtsupport.EmptyTWithHelper{}, handler)
}

// RegisterFailHandlerWithT ensures that the given types.TWithHelper and fail handler
// are used globally.
func RegisterFailHandlerWithT(t types.TWithHelper, handler types.GomegaFailHandler) {
	if handler == nil {
		globalFailWrapper = nil
		return
	}

	globalFailWrapper = &types.GomegaFailWrapper{
		Fail:        handler,
		TWithHelper: t,
	}
}

// RegisterTestingT connects Gomega to Golang's XUnit style
// Testing.T tests.  It is now deprecated and you should use NewWithT() instead.
//
// Legacy Documentation:
//
// You'll need to call this at the top of each XUnit style test:
//
//    func TestFarmHasCow(t *testing.T) {
//        RegisterTestingT(t)
//
//        f := farm.New([]string{"Cow", "Horse"})
//        Expect(f.HasCow()).To(BeTrue(), "Farm should have cow")
//    }
//
// Note that this *testing.T is registered *globally* by Gomega (this is why you don't have to
// pass `t` down to the matcher itself).  This means that you cannot run the XUnit style tests
// in parallel as the global fail handler cannot point to more than one testing.T at a time.
//
// NewWithT() does not have this limitation
//
// (As an aside: Ginkgo gets around this limitation by running parallel tests in different *processes*).
func RegisterTestingT(t types.GomegaTestingT) {
	tWithHelper, hasHelper := t.(types.TWithHelper)
	if !hasHelper {
		RegisterFailHandler(testingtsupport.BuildTestingTGomegaFailWrapper(t).Fail)
		return
	}
	RegisterFailHandlerWithT(tWithHelper, testingtsupport.BuildTestingTGomegaFailWrapper(t).Fail)
}

// InterceptGomegaFailures runs a given callback and returns an array of
// failure messages generated by any Gomega assertions within the callback.
//
// This is accomplished by temporarily replacing the *global* fail handler
// with a fail handler that simply annotates failures.  The original fail handler
// is reset when InterceptGomegaFailures returns.
//
// This is most useful when testing custom matchers, but can also be used to check
// on a value using a Gomega assertion without causing a test failure.
func InterceptGomegaFailures(f func()) []string {
	originalHandler := globalFailWrapper.Fail
	failures := []string{}
	RegisterFailHandler(func(message string, callerSkip ...int) {
		failures = append(failures, message)
	})
	f()
	RegisterFailHandler(originalHandler)
	return failures
}

// Ω wraps an actual value allowing assertions to be made on it:
//    Ω("foo").Should(Equal("foo"))
//
// If Ω is passed more than one argument it will pass the *first* argument to the matcher.
// All subsequent arguments will be required to be nil/zero.
//
// This is convenient if you want to make an assertion on a method/function that returns
// a value and an error - a common patter in Go.
//
// For example, given a function with signature:
//    func MyAmazingThing() (int, error)
//
// Then:
//    Ω(MyAmazingThing()).Should(Equal(3))
// Will succeed only if `MyAmazingThing()` returns `(3, nil)`
//
// Ω and Expect are identical
func Ω(actual interface{}, extra ...interface{}) Assertion {
	return ExpectWithOffset(0, actual, extra...)
}

// Expect wraps an actual value allowing assertions to be made on it:
//    Expect("foo").To(Equal("foo"))
//
// If Expect is passed more than one argument it will pass the *first* argument to the matcher.
// All subsequent arguments will be required to be nil/zero.
//
// This is convenient if you want to make an assertion on a method/function that returns
// a value and an error - a common patter in Go.
//
// For example, given a function with signature:
//    func MyAmazingThing() (int, error)
//
// Then:
//    Expect(MyAmazingThing()).Should(Equal(3))
// Will succeed only if `MyAmazingThing()` returns `(3, nil)`
//
// Expect and Ω are identical
func Expect(actual interface{}, extra ...interface{}) Assertion {
	return ExpectWithOffset(0, actual, extra...)
}

// ExpectWithOffset wraps an actual value allowing assertions to be made on it:
//    ExpectWithOffset(1, "foo").To(Equal("foo"))
//
// Unlike `Expect` and `Ω`, `ExpectWithOffset` takes an additional integer argument
// this is used to modify the call-stack offset when computing line numbers.
//
// This is most useful in helper functions that make assertions.  If you want Gomega's
// error message to refer to the calling line in the test (as opposed to the line in the helper function)
// set the first argument of `ExpectWithOffset` appropriately.
func ExpectWithOffset(offset int, actual interface{}, extra ...interface{}) Assertion {
	if globalFailWrapper == nil {
		panic(nilFailHandlerPanic)
	}
	return assertion.New(actual, globalFailWrapper, offset, extra...)
}

// Eventually wraps an actual value allowing assertions to be made on it.
// The assertion is tried periodically until it passes or a timeout occurs.
//
// Both the timeout and polling interval are configurable as optional arguments:
// The first optional argument is the timeout
// The second optional argument is the polling interval
//
// Both intervals can either be specified as time.Duration, parsable duration strings or as floats/integers.  In the
// last case they are interpreted as seconds.
//
// If Eventually is passed an actual that is a function taking no arguments and returning at least one value,
// then Eventually will call the function periodically and try the matcher against the function's first return value.
//
// Example:
//
//    Eventually(func() int {
//        return thingImPolling.Count()
//    }).Should(BeNumerically(">=", 17))
//
// Note that this example could be rewritten:
//
//    Eventually(thingImPolling.Count).Should(BeNumerically(">=", 17))
//
// If the function returns more than one value, then Eventually will pass the first value to the matcher and
// assert that all other values are nil/zero.
// This allows you to pass Eventually a function that returns a value and an error - a common pattern in Go.
//
// For example, consider a method that returns a value and an error:
//    func FetchFromDB() (string, error)
//
// Then
//    Eventually(FetchFromDB).Should(Equal("hasselhoff"))
//
// Will pass only if the the returned error is nil and the returned string passes the matcher.
//
// Eventually's default timeout is 1 second, and its default polling interval is 10ms
func Eventually(actual interface{}, intervals ...interface{}) AsyncAssertion {
	return EventuallyWithOffset(0, actual, intervals...)
}

// EventuallyWithOffset operates like Eventually but takes an additional
// initial argument to indicate an offset in the call stack.  This is useful when building helper
// functions that contain matchers.  To learn more, read about `ExpectWithOffset`.
func EventuallyWithOffset(offset int, actual interface{}, intervals ...interface{}) AsyncAssertion {
	if globalFailWrapper == nil {
		panic(nilFailHandlerPanic)
	}
	timeoutInterval := defaultEventuallyTimeout
	pollingInterval := defaultEventuallyPollingInterval
	if len(intervals) > 0 {
		timeoutInterval = toDuration(intervals[0])
	}
	if len(intervals) > 1 {
		pollingInterval = toDuration(intervals[1])
	}
	return asyncassertion.New(asyncassertion.AsyncAssertionTypeEventually, actual, globalFailWrapper, timeoutInterval, pollingInterval, offset)
}

// Consistently wraps an actual value allowing assertions to be made on it.
// The assertion is tried periodically and is required to pass for a period of time.
//
// Both the total time and polling interval are configurable as optional arguments:
// The first optional argument is the duration that Consistently will run for
// The second optional argument is the polling interval
//
// Both intervals can either be specified as time.Duration, parsable duration strings or as floats/integers.  In the
// last case they are interpreted as seconds.
//
// If Consistently is passed an actual that is a function taking no arguments and returning at least one value,
// then Consistently will call the function periodically and try the matcher against the function's first return value.
//
// If the function returns more than one value, then Consistently will pass the first value to the matcher and
// assert that all other values are nil/zero.
// This allows you to pass Consistently a function that returns a value and an error - a common pattern in Go.
//
// Consistently is useful in cases where you want to assert that something *does not happen* over a period of tiem.
// For example, you want to assert that a goroutine does *not* send data down a channel.  In this case, you could:
//
//   Consistently(channel).ShouldNot(Receive())
//
// Consistently's default duration is 100ms, and its default polling interval is 10ms
func Consistently(actual interface{}, intervals ...interface{}) AsyncAssertion {
	return ConsistentlyWithOffset(0, actual, intervals...)
}

// ConsistentlyWithOffset operates like Consistnetly but takes an additional
// initial argument to indicate an offset in the call stack. This is useful when building helper
// functions that contain matchers. To learn more, read about `ExpectWithOffset`.
func ConsistentlyWithOffset(offset int, actual interface{}, intervals ...interface{}) AsyncAssertion {
	if globalFailWrapper == nil {
		panic(nilFailHandlerPanic)
	}
	timeoutInterval := defaultConsistentlyDuration
	pollingInterval := defaultConsistentlyPollingInterval
	if len(intervals) > 0 {
		timeoutInterval = toDuration(intervals[0])
	}
	if len(intervals) > 1 {
		pollingInterval = toDuration(intervals[1])
	}
	return asyncassertion.New(asyncassertion.AsyncAssertionTypeConsistently, actual, globalFailWrapper, timeoutInterval, pollingInterval, offset)
}

// SetDefaultEventuallyTimeout sets the default timeout duration for Eventually. Eventually will repeatedly poll your condition until it succeeds, or until this timeout elapses.
func SetDefaultEventuallyTimeout(t time.Duration) {
	defaultEventuallyTimeout = t
}

// SetDefaultEventuallyPollingInterval sets the default polling interval for Eventually.
func SetDefaultEventuallyPollingInterval(t time.Duration) {
	defaultEventuallyPollingInterval = t
}

// SetDefaultConsistentlyDuration sets  the default duration for Consistently. Consistently will verify that your condition is satsified for this long.
func SetDefaultConsistentlyDuration(t time.Duration) {
	defaultConsistentlyDuration = t
}

// SetDefaultConsistentlyPollingInterval sets the default polling interval for Consistently.
func SetDefaultConsistentlyPollingInterval(t time.Duration) {
	defaultConsistentlyPollingInterval = t
}

// AsyncAssertion is returned by Eventually and Consistently and polls the actual value passed into Eventually against
// the matcher passed to the Should and ShouldNot methods.
//
// Both Should and ShouldNot take a variadic optionalDescription argument.  This is passed on to
// fmt.Sprintf() and is used to annotate failure messages.  This allows you to make your failure messages more
// descriptive.
//
// Both Should and ShouldNot return a boolean that is true if the assertion passed and false if it failed.
//
// Example:
//
//   Eventually(myChannel).Should(Receive(), "Something should have come down the pipe.")
//   Consistently(myChannel).ShouldNot(Receive(), "Nothing should have come down the pipe.")
type AsyncAssertion interface {
	Should(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool
	ShouldNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool
}

// GomegaAsyncAssertion is deprecated in favor of AsyncAssertion, which does not stutter.
type GomegaAsyncAssertion = AsyncAssertion

// Assertion is returned by Ω and Expect and compares the actual value to the matcher
// passed to the Should/ShouldNot and To/ToNot/NotTo methods.
//
// Typically Should/ShouldNot are used with Ω and To/ToNot/NotTo are used with Expect
// though this is not enforced.
//
// All methods take a variadic optionalDescription argument.  This is passed on to fmt.Sprintf()
// and is used to annotate failure messages.
//
// All methods return a bool that is true if hte assertion passed and false if it failed.
//
// Example:
//
//    Ω(farm.HasCow()).Should(BeTrue(), "Farm %v should have a cow", farm)
type Assertion interface {
	Should(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool
	ShouldNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool

	To(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool
	ToNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool
	NotTo(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool
}

// GomegaAssertion is deprecated in favor of Assertion, which does not stutter.
type GomegaAssertion = Assertion

// OmegaMatcher is deprecated in favor of the better-named and better-organized types.GomegaMatcher but sticks around to support existing code that uses it
type OmegaMatcher types.GomegaMatcher

// WithT wraps a *testing.T and provides `Expect`, `Eventually`, and `Consistently` methods.  This allows you to leverage
// Gomega's rich ecosystem of matchers in standard `testing` test suites.
//
// Use `NewWithT` to instantiate a `WithT`
type WithT struct {
	t types.GomegaTestingT
}

// GomegaWithT is deprecated in favor of gomega.WithT, which does not stutter.
type GomegaWithT = WithT

// NewWithT takes a *testing.T and returngs a `gomega.WithT` allowing you to use `Expect`, `Eventually`, and `Consistently` along with
// Gomega's rich ecosystem of matchers in standard `testing` test suits.
//
//    func TestFarmHasCow(t *testing.T) {
//        g := gomega.NewWithT(t)
//
//        f := farm.New([]string{"Cow", "Horse"})
//        g.Expect(f.HasCow()).To(BeTrue(), "Farm should have cow")
//     }
func NewWithT(t types.GomegaTestingT) *WithT {
	return &WithT{
		t: t,
	}
}

// NewGomegaWithT is deprecated in favor of gomega.NewWithT, which does not stutter.
func NewGomegaWithT(t types.GomegaTestingT) *GomegaWithT {
	return NewWithT(t)
}

// Expect is used to make assertions. See documentation for Expect.
func (g *WithT) Expect(actual interface{}, extra ...interface{}) Assertion {
	return assertion.New(actual, testingtsupport.BuildTestingTGomegaFailWrapper(g.t), 0, extra...)
}

// Eventually is used to make asynchronous assertions. See documentation for Eventually.
func (g *WithT) Eventually(actual interface{}, intervals ...interface{}) AsyncAssertion {
	timeoutInterval := defaultEventuallyTimeout
	pollingInterval := defaultEventuallyPollingInterval
	if len(intervals) > 0 {
		timeoutInterval = toDuration(intervals[0])
	}
	if len(intervals) > 1 {
		pollingInterval = toDuration(intervals[1])
	}
	return asyncassertion.New(asyncassertion.AsyncAssertionTypeEventually, actual, testingtsupport.BuildTestingTGomegaFailWrapper(g.t), timeoutInterval, pollingInterval, 0)
}

// Consistently is used to make asynchronous assertions. See documentation for Consistently.
func (g *WithT) Consistently(actual interface{}, intervals ...interface{}) AsyncAssertion {
	timeoutInterval := defaultConsistentlyDuration
	pollingInterval := defaultConsistentlyPollingInterval
	if len(intervals) > 0 {
		timeoutInterval = toDuration(intervals[0])
	}
	if len(intervals) > 1 {
		pollingInterval = toDuration(intervals[1])
	}
	return asyncassertion.New(asyncassertion.AsyncAssertionTypeConsistently, actual, testingtsupport.BuildTestingTGomegaFailWrapper(g.t), timeoutInterval, pollingInterval, 0)
}

func toDuration(input interface{}) time.Duration {
	duration, ok := input.(time.Duration)
	if ok {
		return duration
	}

	value := reflect.ValueOf(input)
	kind := reflect.TypeOf(input).Kind()

	if reflect.Int <= kind && kind <= reflect.Int64 {
		return time.Duration(value.Int()) * time.Second
	} else if reflect.Uint <= kind && kind <= reflect.Uint64 {
		return time.Duration(value.Uint()) * time.Second
	} else if reflect.Float32 <= kind && kind <= reflect.Float64 {
		return time.Duration(value.Float() * float64(time.Second))
	} else if reflect.String == kind {
		duration, err := time.ParseDuration(value.String())
		if err != nil {
			panic(fmt.Sprintf("%#v is not a valid parsable duration string.", input))
		}
		return duration
	}

	panic(fmt.Sprintf("%v is not a valid interval.  Must be time.Duration, parsable duration string or a number.", input))
}