Method Diff

mock/mock.go:955–1057

Diff gets a string describing the differences between the arguments and the specified objects. Returns the diff string and number of differences found.

(objects []interface{})

//
// Returns the diff string and number of differences found.
func (args Arguments) Diff(objects []interface{}) (string, int) {
	// TODO: could return string as error and nil for No difference

	output := "\n"
	var differences int

	maxArgCount := len(args)
	if len(objects) > maxArgCount {
		maxArgCount = len(objects)
	}

	for i := 0; i < maxArgCount; i++ {
		var actual, expected interface{}
		var actualFmt, expectedFmt string

		if len(objects) <= i {
			actual = "(Missing)"
			actualFmt = "(Missing)"
		} else {
			actual = objects[i]
			actualFmt = fmt.Sprintf("(%[1]T=%[1]v)", actual)
		}

		if len(args) <= i {
			expected = "(Missing)"
			expectedFmt = "(Missing)"
		} else {
			expected = args[i]
			expectedFmt = fmt.Sprintf("(%[1]T=%[1]v)", expected)
		}

		if matcher, ok := expected.(argumentMatcher); ok {
			var matches bool
			func() {
				defer func() {
					if r := recover(); r != nil {
						actualFmt = fmt.Sprintf("panic in argument matcher: %v", r)
					}
				}()
				matches = matcher.Matches(actual)
			}()
			if matches {
				output = fmt.Sprintf("%s\t%d: PASS:  %s matched by %s\n", output, i, actualFmt, matcher)
			} else {
				differences++
				output = fmt.Sprintf("%s\t%d: FAIL:  %s not matched by %s\n", output, i, actualFmt, matcher)
			}
		} else {
			switch expected := expected.(type) {
			case anythingOfTypeArgument:
				// type checking
				if reflect.TypeOf(actual).Name() != string(expected) && reflect.TypeOf(actual).String() != string(expected) {
					// not match
					differences++
					output = fmt.Sprintf("%s\t%d: FAIL:  type %s != type %s - %s\n", output, i, expected, reflect.TypeOf(actual).Name(), actualFmt)
				}
			case *IsTypeArgument:
				actualT := reflect.TypeOf(actual)