@Test
public void pipelineEmptyListTest() {

    List<Map<String, String>> emptyList = new LinkedList<>();
    SingleValueAssignExtension assign = new SingleValueAssignExtension();
    Assign concreteAssignTag = new Assign();
    concreteAssignTag.setName("var_out_test");
    concreteAssignTag.setExpr("A");
    List<Map<String, String>> processedList = assign.pipelinePossibleStates(concreteAssignTag, emptyList);
    Assert.assertNotNull(processedList);
    Assert.assertEquals(0, processedList.size());
}