package matchers import ( "errors" "fmt" "github.com/onsi/gomega/format" ) type formattedGomegaError interface { FormattedGomegaError() string } type SucceedMatcher struct { } func (matcher *SucceedMatcher) Match(actual interface{}) (success bool, err error) { // is purely nil? if actual == nil { return true, 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 nil (or a pointer to a nil) return isNil(actual), nil } func (matcher *SucceedMatcher) FailureMessage(actual interface{}) (message string) { var fgErr formattedGomegaError if errors.As(actual.(error), &fgErr) { return fgErr.FormattedGomegaError() } return fmt.Sprintf("Expected success, but got an error:\n%s\n%s", format.Object(actual, 1), format.IndentString(actual.(error).Error(), 1)) } func (matcher *SucceedMatcher) NegatedFailureMessage(actual interface{}) (message string) { return "Expected failure, but got no error." }