@Test(expected = KeyNotFoundException.class)
public void decrypt_whenTheEncryptionKeyCannotBeFound_throwsAnException() throws Exception {

  final UUID fakeUuid = UUID.randomUUID();
  reset(encryptionService);
  when(keySet.get(fakeUuid)).thenReturn(null);
  subject.decrypt(new EncryptedValue(fakeUuid, "something we cant read".getBytes(UTF_8), "nonce".getBytes(UTF_8)));
}