@Test
public void testPrepended()
        throws NoSuchAlgorithmException, IOException, NoSuchProviderException, FunctionalException {

    final byte[] encrypted_prepended = Files.readAllBytes(new File("src/test/resources/prepended").toPath());
    final SecretKeySpec secretKey = this.createSecretKeySpec(new File(SRC_TEST_RESOURCES_SECRET).getPath());
    final byte[] decrypted_prepended = new TestableEncService(secretKey).decrypt(encrypted_prepended);
    // in this specific case the length of the decrypted bytes should become
    // 16, after 0 bytes are stripped of
    assertThat(decrypted_prepended.length).isEqualTo(16);
}