### Question:
ServiceV3SessionsPostRequest { @JsonProperty("username") public String getEndUserIdentifier() { return endUserIdentifier; } ServiceV3SessionsPostRequest(
            String endUserIdentifier,
            UUID authorizationRequestId
    ); @JsonProperty("username") String getEndUserIdentifier(); @JsonProperty("auth_request") UUID getAuthorizationRequestId(); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void getEndUserIdentifier() throws Exception { String expected = "Expected User Identifier"; String actual = new ServiceV3SessionsPostRequest(expected, null).getEndUserIdentifier(); assertEquals(expected, actual); }