@Test
public void testSetKylinConfigInEnvIfMissingTakingEmptyProperties() {

    Properties properties = new Properties();
    KylinConfig.setKylinConfigInEnvIfMissing(properties);
    assertEquals(0, properties.size());
    assertTrue(properties.isEmpty());
    KylinConfig.setKylinConfigInEnvIfMissing(properties);
    assertEquals(0, properties.size());
    assertTrue(properties.isEmpty());
}