@Test
  public void authenticateShouldReturnNullIfSuccessful() throws Exception {
    props.setProperty(SECURITY_MANAGER, "dummy");
    String result = authenticator.authenticate(member, props, props);
    assertThat(result).isNull();
  }
Unit tests GMSAuthenticator using new integrated security.
geode-core/src/test/java/org/apache/geode/distributed/internal/membership/adapter/auth/GMSAuthenticatorWithSecurityManagerTest.java