dmusic/tests: Add some DirectMusicCollection tests.

dlls/dmusic/tests/dmusic.c

@@ -320,6 +320,46 @@ static void test_COM_dmcoll(void)
     while (IDirectMusicCollection_Release(dmc));
 }
 
+static void test_dmcoll(void)
+{
+    IDirectMusicCollection *dmc;
+    IDirectMusicObject *dmo;
+    DMUS_OBJECTDESC desc;
+    HRESULT hr;
+
+    hr = CoCreateInstance(&CLSID_DirectMusicCollection, NULL, CLSCTX_INPROC_SERVER,
+            &IID_IDirectMusicCollection, (void**)&dmc);
+    ok(hr == S_OK, "DirectMusicCollection create failed: %08x, expected S_OK\n", hr);
+
+    /* IDirectMusicObject */
+    hr = IDirectMusicCollection_QueryInterface(dmc, &IID_IDirectMusicObject, (void**)&dmo);
+    ok(hr == S_OK, "QueryInterface for IID_IDirectMusicObject failed: %08x\n", hr);
+    hr = IDirectMusicObject_GetDescriptor(dmo, NULL);
+    ok(hr == E_POINTER, "IDirectMusicObject_GetDescriptor: expected E_POINTER, got  %08x\n", hr);
+    hr = IDirectMusicObject_SetDescriptor(dmo, NULL);
+    ok(hr == E_POINTER, "IDirectMusicObject_SetDescriptor: expected E_POINTER, got  %08x\n", hr);
+    ZeroMemory(&desc, sizeof(desc));
+    hr = IDirectMusicObject_GetDescriptor(dmo, &desc);
+    ok(hr == S_OK, "IDirectMusicObject_GetDescriptor failed: %08x\n", hr);
+    ok(desc.dwValidData == DMUS_OBJ_CLASS,
+            "Fresh object has more valid data (%08x) than DMUS_OBJ_CLASS\n", desc.dwValidData);
+    /* DMUS_OBJ_CLASS is immutable */
+    desc.dwValidData = DMUS_OBJ_CLASS;
+    hr = IDirectMusicObject_SetDescriptor(dmo, &desc);
+    ok(hr == S_FALSE , "IDirectMusicObject_SetDescriptor failed: %08x\n", hr);
+    ok(!desc.dwValidData, "dwValidData wasn't cleared:  %08x\n", desc.dwValidData);
+    desc.dwValidData = DMUS_OBJ_CLASS;
+    desc.guidClass = CLSID_DirectMusicSegment;
+    hr = IDirectMusicObject_SetDescriptor(dmo, &desc);
+    ok(hr == S_FALSE && !desc.dwValidData, "IDirectMusicObject_SetDescriptor failed: %08x\n", hr);
+    hr = IDirectMusicObject_GetDescriptor(dmo, &desc);
+    ok(hr == S_OK, "IDirectMusicObject_GetDescriptor failed: %08x\n", hr);
+    ok(IsEqualGUID(&desc.guidClass, &CLSID_DirectMusicCollection),
+            "guidClass changed, should be CLSID_DirectMusicCollection\n");
+
+    while (IDirectMusicCollection_Release(dmc));
+}
+
 static BOOL missing_dmusic(void)
 {
     IDirectMusic8 *dm;
@@ -348,6 +388,7 @@ START_TEST(dmusic)
     test_COM_dmcoll();
     test_dmusic();
     test_dmbuffer();
+    test_dmcoll();
 
     CoUninitialize();
 }