@Test
public void emptyListTest() {

    CallCheckTransformer dummyTransformer = new CallCheckTransformer();
    HashMap<String, DataTransformer> transformerNames = new HashMap<>();
    transformerNames.put("dummy", dummyTransformer);
    InLineTransformerExtension transformerExtension = new InLineTransformerExtension(transformerNames);
    List<Map<String, String>> emptyList = new LinkedList<>();
    InLineTransformerExtension.TransformTag transformTag = new InLineTransformerExtension.TransformTag();
    transformTag.setName("dummy");
    List<Map<String, String>> resultList = transformerExtension.pipelinePossibleStates(transformTag, emptyList);
    Assert.assertNotNull(resultList);
    Assert.assertEquals(0, resultList.size());
    Assert.assertFalse(dummyTransformer.isWasCalled());
}