### Question:
Ed25519phSchemeProvider extends SchemeProvider { @Override public PrivateKey generatePrivateKey() { SecureRandom random = new SecureRandom(); byte[] seed = new byte[32]; random.nextBytes(seed); return PrivateKey.newInstance(seed); } Ed25519phSchemeProvider(HashAlgorithm algorithm); @Override EdDsaSigner getSigner(); @Override PublicKeyDelegate getPublicKeyDelegate(); @Override PrivateKey generatePrivateKey(); @Override byte[] preHash(byte[] input); @Override byte[] dom(byte[] context);  }### Answer:
@Test public void success_GenerateRandomPrivateKey() { SchemeProvider schemeProvider = new Ed25519phSchemeProvider(HashAlgorithm.SHAKE_256); PrivateKey privateKey = schemeProvider.generatePrivateKey(); assertNotNull(privateKey); }