### Question:
SslUtils { static boolean isTLSv13Cipher(String cipher) { return TLSV13_CIPHERS.contains(cipher); } private  SslUtils();   }### Answer:
@Test public void testIsTLSv13Cipher() { assertTrue(SslUtils.isTLSv13Cipher("TLS_AES_128_GCM_SHA256")); assertTrue(SslUtils.isTLSv13Cipher("TLS_AES_256_GCM_SHA384")); assertTrue(SslUtils.isTLSv13Cipher("TLS_CHACHA20_POLY1305_SHA256")); assertTrue(SslUtils.isTLSv13Cipher("TLS_AES_128_CCM_SHA256")); assertTrue(SslUtils.isTLSv13Cipher("TLS_AES_128_CCM_8_SHA256")); assertFalse(SslUtils.isTLSv13Cipher("TLS_DHE_RSA_WITH_AES_128_GCM_SHA256")); }