Function TestWithDomain

domains/domains_test.go:99–118

This test demonstrates how the original domain becomes invisible via WithDomain(), but the original error remains visible as cause.

(t *testing.T)

// This test demonstrates how the original domain becomes invisible
// via WithDomain(), but the original error remains visible as cause.
func TestWithDomain(t *testing.T) {
	origErr := domains.New("hello")
	t.Logf("origErr: %# v", pretty.Formatter(origErr))
	origDomain := domains.GetDomain(origErr)

	otherDomain := domains.NamedDomain("woo")
	err := domains.WithDomain(origErr, otherDomain)
	t.Logf("err: %# v", pretty.Formatter(err))

	tt := testutils.T{T: t}

	// The original domain becomes invisible.
	tt.Check(domains.NotInDomain(err, origDomain))

	// The cause remains visible.
	tt.Check(markers.Is(err, origErr))

	// Moreover, the error message is preserved fully.
	tt.CheckEqual(err.Error(), "hello")
}

// This test demonstrates how the original domain becomes invisible
// via HandledInDomain(), and even the original error becomes invisible.