Function TestErrorEquality

errors_test.go:231–251

errors.New, etc values are not expected to be compared by value but the change in errors#27 made them incomparable. Assert that various kinds of errors have a functional equality operator, even if the result of that equality is always false.

(t *testing.T)

// various kinds of errors have a functional equality operator, even
// if the result of that equality is always false.
func TestErrorEquality(t *testing.T) {
	vals := []error{
		nil,
		io.EOF,
		errors.New("EOF"),
		New("EOF"),
		Errorf("EOF"),
		Wrap(io.EOF, "EOF"),
		Wrapf(io.EOF, "EOF%d", 2),
		WithMessage(nil, "whoops"),
		WithMessage(io.EOF, "whoops"),
		WithStack(io.EOF),
		WithStack(nil),
	}

	for i := range vals {
		for j := range vals {
			_ = vals[i] == vals[j] // mustn't panic
		}
	}
}