### Question:
JWTCreator { static JWTCreator.Builder init() { return new Builder(); } private  JWTCreator(Algorithm algorithm, Map<String, Object> headerClaims, Map<String, Object> payloadClaims);   }### Answer:
@Test public void shouldThrowOnNullCustomClaimName() throws Exception { exception.expect(IllegalArgumentException.class); exception.expectMessage("The Custom Claim's name can't be null."); JWTCreator.init() .withClaim(null, "value"); }