Equality matcher for Gomega

matcher.go

// source: https://github.com/golang/mock/issues/616#issuecomment-1049275800
// see the differences between expected and wanted object in a nice format
type eqMatcher struct {
	want interface{}
}

func EqMatcher(want interface{}) eqMatcher {
	return eqMatcher{
		want: want,
	}
}

func (eq eqMatcher) Matches(got interface{}) bool {
	return gomock.Eq(eq.want).Matches(got)
}

func (eq eqMatcher) Got(got interface{}) string {
	return fmt.Sprintf("%v (%T)\nDiff (-got +want):\n%s", got, got, strings.TrimSpace(cmp.Diff(got, eq.want)))
}

func (eq eqMatcher) String() string {
	return fmt.Sprintf("%v (%T)\n", eq.want, eq.want)
}