### Question:
DefaultSecretGenerator implements SecretGenerator { @Override public String generate() { return new String(encoder.encode(getRandomBytes())); } DefaultSecretGenerator();  DefaultSecretGenerator(int numCharacters); @Override String generate();  }### Answer:
@Test public void testSecretGenerated() { DefaultSecretGenerator generator = new DefaultSecretGenerator(); String secret = generator.generate(); assertNotNull(secret); assertTrue(secret.length() > 0); }
@Test public void testCharacterLengths() { for (int charCount : new int[]{16, 32, 64, 128}) { DefaultSecretGenerator generator = new DefaultSecretGenerator(charCount); String secret = generator.generate(); assertEquals(charCount, secret.length()); } }
@Test public void testValidBase32Encoded() { DefaultSecretGenerator generator = new DefaultSecretGenerator(); String secret = generator.generate(); assertTrue(secret.matches("^[A-Z2-7]+=*$")); assertEquals(0, secret.length() % 8); }