### Question:
SpiffeKeyManagerFactory extends KeyManagerFactorySpi { @Override protected void engineInit(final KeyStore keyStore, final char[] chars) { }  KeyManager[] engineGetKeyManagers(@NonNull final X509SvidSource x509SvidSource);  }### Answer:
@Test void engineInit() { new SpiffeKeyManagerFactory().engineInit(null); new SpiffeKeyManagerFactory().engineInit(null, null); }