@Test
  public void testGetSystemFactoryEmptyClassName() {
    Map<String, String> map = new HashMap<>();
    map.put(MOCK_SYSTEM_FACTORY_NAME1, "");
    map.put(MOCK_SYSTEM_FACTORY_NAME2, " ");
    SystemConfig systemConfig = new SystemConfig(new MapConfig(map));

    assertFalse(systemConfig.getSystemFactory(MOCK_SYSTEM_NAME1).isPresent());
    assertFalse(systemConfig.getSystemFactory(MOCK_SYSTEM_NAME2).isPresent());
  }
Placeholder to help make sure the correct {@link SystemAdmin} is returned by {@link MockSystemFactory}. Do not mock
any methods of this mock.
samza-core/src/test/java/org/apache/samza/config/TestSystemConfig.java