package matchers import ( "fmt" "github.com/onsi/gomega/format" ) type HaveOccurredMatcher struct { } func (matcher *HaveOccurredMatcher) Match(actual interface{}) (success bool, err error) { // is purely nil? if actual == nil { return false, nil } // must be an 'error' type if !isError(actual) { return false, fmt.Errorf("Expected an error-type. Got:\n%s", format.Object(actual, 1)) } // must be non-nil (or a pointer to a non-nil) return !isNil(actual), nil } func (matcher *HaveOccurredMatcher) FailureMessage(actual interface{}) (message string) { return fmt.Sprintf("Expected an error to have occurred. Got:\n%s", format.Object(actual, 1)) } func (matcher *HaveOccurredMatcher) NegatedFailureMessage(actual interface{}) (message string) { return fmt.Sprintf("Unexpected error:\n%s\n%s\n%s", format.Object(actual, 1), format.IndentString(actual.(error).Error(), 1), "occurred") }