testGCMKeyRotation(t, newHKDFExtendedNonceGCMTransformerTest)
	})
}

func testGCMKeyRotation(t *testing.T, f transformerFunc) {
	key1 := []byte("abcdefghijklmnopabcdefghijklmnop")
	key2 := []byte("0123456789abcdef0123456789abcdef")

	testErr := fmt.Errorf("test error")
	block1, err := aes.NewCipher(key1)
	if err != nil {
		t.Fatal(err)
	}
	block2, err := aes.NewCipher(key2)
	if err != nil {
		t.Fatal(err)
	}