package matchers import ( "fmt" "reflect" "github.com/onsi/gomega/format" ) type BeClosedMatcher struct { } func (matcher *BeClosedMatcher) Match(actual interface{}) (success bool, err error) { if !isChan(actual) { return false, fmt.Errorf("BeClosed matcher expects a channel. Got:\n%s", format.Object(actual, 1)) } channelType := reflect.TypeOf(actual) channelValue := reflect.ValueOf(actual) if channelType.ChanDir() == reflect.SendDir { return false, fmt.Errorf("BeClosed matcher cannot determine if a send-only channel is closed or open. Got:\n%s", format.Object(actual, 1)) } winnerIndex, _, open := reflect.Select([]reflect.SelectCase{ {Dir: reflect.SelectRecv, Chan: channelValue}, {Dir: reflect.SelectDefault}, }) var closed bool if winnerIndex == 0 { closed = !open } else if winnerIndex == 1 { closed = false } return closed, nil } func (matcher *BeClosedMatcher) FailureMessage(actual interface{}) (message string) { return format.Message(actual, "to be closed") } func (matcher *BeClosedMatcher) NegatedFailureMessage(actual interface{}) (message string) { return format.Message(actual, "to be open") }