t.Errorf("%d: unexpected value received by transformer: %s", i, transformers[test.match].Transformer.(*testTransformer).receivedFrom)
		}
	}
}

func TestPrefixTo(t *testing.T) {
	testErr := fmt.Errorf("test error")
	transformErr := fmt.Errorf("test error")
	testCases := []struct {
		transformers []PrefixTransformer
		expect       []byte
		err          error
	}{