@Test
  public void testGetSystemFactories() {
    Map<String, String> map = ImmutableMap.of(MOCK_SYSTEM_FACTORY_NAME1, MockSystemFactory.class.getName());
    SystemConfig systemConfig = new SystemConfig(new MapConfig(map));
    Map<String, SystemFactory> actual = systemConfig.getSystemFactories();
    assertEquals(actual.size(), 1);
    assertTrue(actual.get(MOCK_SYSTEM_NAME1) instanceof MockSystemFactory);
  }
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