### Question:
JWTData { public String getSubject() { return subject; } JWTData(String issuer, String subject, String audience, String keyId); String getIssuer(); String getSubject(); String getAudience(); String getKeyId(); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void getSubject() throws Exception { assertEquals("subject", new JWTData(null, "subject", null, null).getSubject()); }