@Test
public void verifyTokenIllegalArgumentTest() throws Exception {

    // Setup:
    when(mobiTokenVerifier.verifyToken("error")).thenThrow(new IllegalArgumentException());
    Optional<SignedJWT> result = manager.verifyToken("error");
    assertFalse(result.isPresent());
    verify(mobiTokenVerifier).verifyToken("error");
    verify(otherVerifier).verifyToken("error");
}