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path: root/vendor/github.com/onsi/gomega/gomega_dsl.go
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/*
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 (
	"errors"
	"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 = "1.14.0"

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.
// Exeuction continues after the first failure allowing users to collect all failures
// in the callback.
//
// 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)
	})
	defer func() {
		RegisterFailHandler(originalHandler)
	}()
	f()
	return failures
}

// InterceptGomegaFailure runs a given callback and returns the first
// failure message generated by any Gomega assertions within the callback, wrapped in an error.
//
// The callback ceases execution as soon as the first failed assertion occurs, however Gomega
// does not register a failure with the FailHandler registered via RegisterFailHandler - it is up
// to the user to decide what to do with the returned error
func InterceptGomegaFailure(f func()) (err error) {
	originalHandler := globalFailWrapper.Fail
	RegisterFailHandler(func(message string, callerSkip ...int) {
		err = errors.New(message)
		panic("stop execution")
	})

	defer func() {
		RegisterFailHandler(originalHandler)
		if e := recover(); e != nil {
			if err == nil {
				panic(e)
			}
		}
	}()

	f()
	return err
}

// 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
// that 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,
// 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 allows you to make assertions in the pased-in function.  The function is assumed to have failed and will be retried if any assertion in the function fails.
// For example:
//
//     Eventually(func() Widget {
//	     resp, err := http.Get(url)
//       Expect(err).NotTo(HaveOccurred())
//       defer resp.Body.Close()
//       Expect(resp.SatusCode).To(Equal(http.StatusOK))
//       var widget Widget
//       Expect(json.NewDecoder(resp.Body).Decode(&widget)).To(Succeed())
//       return widget
//     }).Should(Equal(expectedWidget))
//
// will keep trying the passed-in function until all its assertsions pass (i.e. the http request succeeds) _and_ the returned object satisfies the passed-in matcher.
//
// Functions passed to Eventually typically have a return value.  However you are allowed to pass in a function with no return value.  Eventually assumes such a function
// is making assertions and will turn it into a function that returns an error if any assertion fails, or nil if no assertion fails.  This allows you to use the Succeed() matcher
// to express that a complex operation should eventually succeed.  For example:
//
//    Eventually(func() {
//        model, err := db.Find("foo")
//        Expect(err).NotTo(HaveOccurred())
//        Expect(model.Reticulated()).To(BeTrue())
//        Expect(model.Save()).To(Succeed())
//    }).Should(Succeed())
//
// will rerun the function until all its assertions pass.
//
// 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.
//
// If the function returns 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.
//
// Like Eventually, Consistently allows you to make assertions in the function.  If any assertion fails Consistently will fail.  In addition,
// Consistently also allows you to pass in a function with no return value.  In this case Consistently can be paired with the Succeed() matcher to assert
// that no assertions in the function fail.
//
// Consistently is useful in cases where you want to assert that something *does not happen* over a period of time.
// 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 Consistently 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 satisfied 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 argument allows you to make your failure messages more descriptive.
// If a single argument of type `func() string` is passed, this function will be lazily evaluated if a failure occurs
// and the returned string is used to annotate the failure message.
// Otherwise, this argument is passed on to fmt.Sprintf() and then used to annotate the failure message.
//
// 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(), func() string { return "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 argument allows you to make your failure messages more descriptive.
// If a single argument of type `func() string` is passed, this function will be lazily evaluated if a failure occurs
// and the returned string is used to annotate the failure message.
// Otherwise, this argument is passed on to fmt.Sprintf() and then used to annotate the failure message.
//
// All methods return a bool that is true if the 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 {
	failWrapper *types.GomegaFailWrapper
}

// 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{
		failWrapper: testingtsupport.BuildTestingTGomegaFailWrapper(t),
	}
}

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

// ExpectWithOffset is used to make assertions. See documentation for ExpectWithOffset.
func (g *WithT) ExpectWithOffset(offset int, actual interface{}, extra ...interface{}) Assertion {
	return assertion.New(actual, g.failWrapper, offset, extra...)
}

// EventuallyWithOffset is used to make asynchronous assertions. See documentation for EventuallyWithOffset.
func (g *WithT) EventuallyWithOffset(offset int, 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, g.failWrapper, timeoutInterval, pollingInterval, offset)
}

// ConsistentlyWithOffset is used to make asynchronous assertions. See documentation for ConsistentlyWithOffset.
func (g *WithT) ConsistentlyWithOffset(offset int, 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, g.failWrapper, timeoutInterval, pollingInterval, offset)
}

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

// Eventually is used to make asynchronous assertions. See documentation for Eventually.
func (g *WithT) Eventually(actual interface{}, intervals ...interface{}) AsyncAssertion {
	return g.EventuallyWithOffset(0, actual, intervals...)
}

// Consistently is used to make asynchronous assertions. See documentation for Consistently.
func (g *WithT) Consistently(actual interface{}, intervals ...interface{}) AsyncAssertion {
	return g.ConsistentlyWithOffset(0, actual, intervals...)
}

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))
}

// Gomega describes the essential Gomega DSL. This interface allows libraries
// to abstract between the standard package-level function implementations
// and alternatives like *WithT.
type Gomega interface {
	Expect(actual interface{}, extra ...interface{}) Assertion
	Eventually(actual interface{}, intervals ...interface{}) AsyncAssertion
	Consistently(actual interface{}, intervals ...interface{}) AsyncAssertion
}

type globalFailHandlerGomega struct{}

// DefaultGomega supplies the standard package-level implementation
var Default Gomega = globalFailHandlerGomega{}

// Expect is used to make assertions. See documentation for Expect.
func (globalFailHandlerGomega) Expect(actual interface{}, extra ...interface{}) Assertion {
	return Expect(actual, extra...)
}

// Eventually is used to make asynchronous assertions. See documentation for Eventually.
func (globalFailHandlerGomega) Eventually(actual interface{}, extra ...interface{}) AsyncAssertion {
	return Eventually(actual, extra...)
}

// Consistently is used to make asynchronous assertions. See documentation for Consistently.
func (globalFailHandlerGomega) Consistently(actual interface{}, extra ...interface{}) AsyncAssertion {
	return Consistently(actual, extra...)
}