### Question:
SpiffeKeyStore extends KeyStoreSpi { @Override public Key engineGetKey(final String alias, final char[] password) { return null; }  @Override Key engineGetKey(final String alias, final char[] password); @Override Certificate[] engineGetCertificateChain(final String alias); @Override Certificate engineGetCertificate(final String alias); @Override Date engineGetCreationDate(final String alias); @Override void engineSetKeyEntry(final String alias, final Key key, final char[] password, final Certificate[] chain); @Override void engineSetKeyEntry(final String alias, final byte[] key, final Certificate[] chain); @Override void engineSetCertificateEntry(final String alias, final Certificate cert); @Override void engineDeleteEntry(final String alias); @Override Enumeration<String> engineAliases(); @Override boolean engineContainsAlias(final String alias); @Override int engineSize(); @Override boolean engineIsKeyEntry(final String alias); @Override boolean engineIsCertificateEntry(final String alias); @Override String engineGetCertificateAlias(final Certificate cert); @Override void engineStore(final OutputStream stream, final char[] password); @Override void engineLoad(final InputStream stream, final char[] password);  }### Answer:
@Test void engineGetKey() { assertNull(spiffeKeyStore.engineGetKey("alias", "pass".toCharArray())); }