@Test
  public void getCredentialsShouldReturnNullIfNoPeerAuthInit() throws Exception {
    Properties credentials = authenticator.getCredentials(member, props);
    assertThat(credentials).isNull();
  }
Unit tests GMSAuthenticator using new integrated security.
geode-core/src/test/java/org/apache/geode/distributed/internal/membership/adapter/auth/GMSAuthenticatorWithSecurityManagerTest.java