@Test
 public void testGetMandatoryDocumentsList() {
   // use LinkedHashMap to preserve inserting order.
   mdCompositor.mandatoryDocumentsMap = new LinkedHashMap<String, IMandatoryDocumentRole>();
   IMandatoryDocumentRole mockA_mandDoc = createMockAndAddToDefault(IMandatoryDocumentRole.class);
   expect(mockA_mandDoc.dependsOnMandatoryDocuments())
       .andReturn(Collections.<String>emptyList())
       .atLeastOnce();
   IMandatoryDocumentRole mockB_mandDocDepA =
       createMockAndAddToDefault(IMandatoryDocumentRole.class);
   expect(mockB_mandDocDepA.dependsOnMandatoryDocuments())
       .andReturn(Arrays.asList("A_mandDoc"))
       .atLeastOnce();
   mdCompositor.mandatoryDocumentsMap.put("B_mandDocDepA", mockB_mandDocDepA);
   mdCompositor.mandatoryDocumentsMap.put("A_mandDoc", mockA_mandDoc);
   replayDefault();
   List<String> expectedExedList = Arrays.asList("A_mandDoc", "B_mandDocDepA");
   assertFalse(
       "check precondition",
       expectedExedList.equals(
           new ArrayList<String>(mdCompositor.mandatoryDocumentsMap.keySet())));
   assertEquals(expectedExedList, mdCompositor.getMandatoryDocumentsList());
   verifyDefault();
 }
 @Test
 public void testGetMandatoryDocumentsList_empty() {
   replayDefault();
   assertEquals(Collections.emptyList(), mdCompositor.getMandatoryDocumentsList());
   verifyDefault();
 }
 @Before
 public void setUp_MandatoryDocumentCompositorTest() throws Exception {
   mdCompositor = new MandatoryDocumentCompositor();
   mdCompositor.execution = Utils.getComponent(Execution.class);
   mdCompositor.mandatoryDocumentsMap = new HashMap<String, IMandatoryDocumentRole>();
 }