package matchers import ( "fmt" "github.com/onsi/gomega/format" "reflect" ) type PanicMatcher struct{} func (matcher *PanicMatcher) Match(actual interface{}) (success bool, err error) { if actual == nil { return false, fmt.Errorf("PanicMatcher expects a non-nil actual.") } actualType := reflect.TypeOf(actual) if actualType.Kind() != reflect.Func { return false, fmt.Errorf("PanicMatcher expects a function. Got:\n%s", format.Object(actual, 1)) } if !(actualType.NumIn() == 0 && actualType.NumOut() == 0) { return false, fmt.Errorf("PanicMatcher expects a function with no arguments and no return value. Got:\n%s", format.Object(actual, 1)) } success = false defer func() { if e := recover(); e != nil { success = true } }() reflect.ValueOf(actual).Call([]reflect.Value{}) return } func (matcher *PanicMatcher) FailureMessage(actual interface{}) (message string) { return format.Message(actual, "to panic") } func (matcher *PanicMatcher) NegatedFailureMessage(actual interface{}) (message string) { return format.Message(actual, "not to panic") }