riched20/tests: Add some object identity tests.

dlls/riched20/tests/richole.c

@@ -149,6 +149,7 @@ static void test_Interfaces(void)
   LRESULT res;
   HWND w;
   ULONG refcount;
+  IUnknown *unk, *unk2;
 
   w = new_richedit(NULL);
   if (!w) {
@@ -180,6 +181,14 @@ static void test_Interfaces(void)
   hres = ITextDocument_GetSelection(txtDoc, &txtSel);
   ok(hres == S_OK, "got 0x%08x\n", hres);
 
+  hres = ITextDocument_QueryInterface(txtDoc, &IID_IUnknown, (void **)&unk);
+  ok(hres == S_OK, "got 0x%08x\n", hres);
+  hres = ITextSelection_QueryInterface(txtSel, &IID_IUnknown, (void **)&unk2);
+  ok(hres == S_OK, "got 0x%08x\n", hres);
+  ok(unk != unk2, "unknowns are the same\n");
+  IUnknown_Release(unk2);
+  IUnknown_Release(unk);
+
   EXPECT_REF(txtDoc, 4);
   EXPECT_REF(txtSel, 2);
 

dlls/riched20/tests/txtsrv.c

@@ -917,6 +917,7 @@ static void test_QueryInterface(void)
     IRichEditOle *reole, *txtsrv_reole;
     ITextDocument *txtdoc, *txtsrv_txtdoc;
     ITextDocument2Old *txtdoc2old, *txtsrv_txtdoc2old;
+    IUnknown *unk, *unk2;
     ULONG refcount;
 
     if(!init_texthost(&txtserv, &host))
@@ -933,6 +934,14 @@ static void test_QueryInterface(void)
     refcount = get_refcount((IUnknown *)txtsrv_reole);
     ok(refcount == 2, "got wrong ref count: %d\n", refcount);
 
+    hres = ITextServices_QueryInterface( txtserv, &IID_IUnknown, (void **)&unk );
+    ok( hres == S_OK, "got 0x%08x\n", hres );
+    hres = IRichEditOle_QueryInterface( txtsrv_reole, &IID_IUnknown, (void **)&unk2 );
+    ok( hres == S_OK, "got 0x%08x\n", hres );
+    ok( unk == unk2, "unknowns differ\n" );
+    IUnknown_Release( unk2 );
+    IUnknown_Release( unk );
+
     hres = IRichEditOle_QueryInterface(txtsrv_reole, &IID_ITextDocument, (void **)&txtdoc);
     ok(hres == S_OK, "IRichEditOle_QueryInterface: 0x%08x\n", hres);
     refcount = get_refcount((IUnknown *)txtserv);