Function diff

assert/assertions.go:1855–1896

diff returns a diff of both values as long as both are of the same type and are a struct, map, slice, array or string. Otherwise it returns an empty string.

(expected interface{}, actual interface{})

// diff returns a diff of both values as long as both are of the same type and
// are a struct, map, slice, array or string. Otherwise it returns an empty string.
func diff(expected interface{}, actual interface{}) string {
	if expected == nil || actual == nil {
		return ""
	}

	et, ek := typeAndKind(expected)
	at, _ := typeAndKind(actual)

	if et != at {
		return ""
	}

	if ek != reflect.Struct && ek != reflect.Map && ek != reflect.Slice && ek != reflect.Array && ek != reflect.String {
		return ""
	}

	var e, a string

	switch et {
	case reflect.TypeOf(""):
		e = reflect.ValueOf(expected).String()
		a = reflect.ValueOf(actual).String()
	case reflect.TypeOf(time.Time{}):
		e = spewConfigStringerEnabled.Sdump(expected)
		a = spewConfigStringerEnabled.Sdump(actual)
	default:
		e = spewConfig.Sdump(expected)
		a = spewConfig.Sdump(actual)
	}

	diff, _ := difflib.GetUnifiedDiffString(difflib.UnifiedDiff{
		A:        difflib.SplitLines(e),
		B:        difflib.SplitLines(a),
		FromFile: "Expected",
		FromDate: "",
		ToFile:   "Actual",
		ToDate:   "",
		Context:  1,
	})

	return "\n\nDiff:\n" + diff
}

func isFunction(arg interface{}) bool {
	if arg == nil {