@Test
  public void systemHasAlertListenerForMemberIsFalseByDefault() {
    assertThat(internalDistributedSystem.hasAlertListenerFor(member)).isFalse();
    for (AlertLevel alertLevel : AlertLevel.values()) {
      assertThat(internalDistributedSystem.hasAlertListenerFor(member, alertLevel.intLevel()))
          .isFalse();
    }
  }
Integration tests for adding and removing {@code Alert} listeners.
geode-log4j/src/integrationTest/java/org/apache/geode/alerting/log4j/internal/impl/AlertListenerRegistrationIntegrationTest.java