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matchers.go
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matchers.go
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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,
}
}
//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()
// Ω(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()
// Ω(err).ShouldNot(HaveOccurred())
//
//You can write:
// Ω(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:
// Ω(err).Should(MatchError("an error")) //asserts that err.Error() == "an error"
// Ω(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 Ω(c).Should(Receive()) will fail and Ω(c).ShouldNot(Receive()) will pass.
//
//- If the channel `c` is closed then Ω(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 Ω(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:
// Ω(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))
// Ω(myThing.Sprocket).Should(Equal("foo"))
// Ω(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 Ω(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 Ω(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 regexp. 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,
}
}
//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,
}
}
//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:
// Ω([]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,
}
}
//ConsistOf succeeds if actual contains preciely 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:
//
// Ω([]string{"Foo", "FooBar"}).Should(ConsistOf("FooBar", "Foo"))
// Ω([]string{"Foo", "FooBar"}).Should(ConsistOf(ContainSubstring("Bar"), "Foo"))
// Ω([]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:
//
// Ω([]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,
}
}
//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:
// Ω(map[string]string{"Foo": "Bar", "BazFoo": "Duck"}).Should(HaveKey(MatchRegexp(`.+Foo$`)))
func HaveKey(key interface{}) types.GomegaMatcher {
return &matchers.HaveKeyMatcher{
Key: key,
}
}
//HaveKeyWithValue succeeds if actual is a map with the passed in key and value.
//By default HaveKeyWithValue uses Equal() to perform the match, however a
//matcher can be passed in instead:
// Ω(map[string]string{"Foo": "Bar", "BazFoo": "Duck"}).Should(HaveKeyWithValue("Foo", "Bar"))
// Ω(map[string]string{"Foo": "Bar", "BazFoo": "Duck"}).Should(HaveKeyWithValue(MatchRegexp(`.+Foo$`), "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 (floa32, float64, uint8, etc...).
//
//There are six, self-explanatory, supported comparators:
// Ω(1.0).Should(BeNumerically("==", 1))
// Ω(1.0).Should(BeNumerically("~", 0.999, 0.01))
// Ω(1.0).Should(BeNumerically(">", 0.9))
// Ω(1.0).Should(BeNumerically(">=", 1.0))
// Ω(1.0).Should(BeNumerically("<", 3))
// Ω(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
// Ω(time.Now()).Should(BeTemporally(">", time.Time{}))
// Ω(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.
// Ω(0).Should(BeAssignableToTypeOf(0)) // Same values
// Ω(5).Should(BeAssignableToTypeOf(-1)) // different values same type
// Ω("foo").Should(BeAssignableToTypeOf("bar")) // different values same type
// Ω(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{}
}