ole32/tests: Test PropVariantCopy() with VT_UNKNOWN.

dlls/ole32/tests/propvariant.c

@@ -18,6 +18,8 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#define COBJMACROS
+
 #include "windows.h"
 #include "wtypes.h"
 #include "ddeml.h"
@@ -298,10 +300,55 @@ static void test_validtypes(void)
     }
 }
 
+struct unk_impl
+{
+    IUnknown IUnknown_iface;
+    LONG ref;
+};
+
+static inline struct unk_impl *impl_from_IUnknown(IUnknown *iface)
+{
+    return CONTAINING_RECORD(iface, struct unk_impl, IUnknown_iface);
+}
+
+static HRESULT WINAPI unk_QueryInterface(IUnknown *iface, REFIID riid, void **ppv)
+{
+    struct unk_impl *This = impl_from_IUnknown(iface);
+    if(winetest_debug > 1)
+        trace("Call to unk_QueryInterface()\n");
+    *ppv = &This->IUnknown_iface;
+    IUnknown_AddRef(iface);
+    return S_OK;
+}
+
+static ULONG WINAPI unk_AddRef(IUnknown *iface)
+{
+    struct unk_impl *This = impl_from_IUnknown(iface);
+    if(winetest_debug > 1)
+        trace("Call to unk_AddRef()\n");
+    return InterlockedIncrement(&This->ref);
+}
+
+static ULONG WINAPI unk_Release(IUnknown *iface)
+{
+    struct unk_impl *This = impl_from_IUnknown(iface);
+    if(winetest_debug > 1)
+        trace("Call to unk_Release()\n");
+    return InterlockedDecrement(&This->ref);
+}
+
+static const IUnknownVtbl unk_vtbl =
+{
+    unk_QueryInterface,
+    unk_AddRef,
+    unk_Release
+};
+
 static void test_copy(void)
 {
     static char szTestString[] = "Test String";
     static WCHAR wszTestString[] = {'T','e','s','t',' ','S','t','r','i','n','g',0};
+    struct unk_impl unk_obj = {{&unk_vtbl}, 1};
     PROPVARIANT propvarSrc;
     PROPVARIANT propvarDst;
     HRESULT hr;
@@ -334,6 +381,17 @@ static void test_copy(void)
     hr = PropVariantClear(&propvarDst);
     ok(hr == S_OK, "PropVariantClear(...VT_LPSTR...) failed\n");
     memset(&propvarSrc, 0, sizeof(propvarSrc));
+
+    propvarSrc.vt = VT_UNKNOWN;
+    U(propvarSrc).punkVal = &unk_obj.IUnknown_iface;
+    hr = PropVariantCopy(&propvarDst, &propvarSrc);
+    ok(hr == S_OK, "PropVariantCopy(...VT_UNKNOWN...) failed: 0x%08x.\n", hr);
+    ok(U(propvarDst).punkVal == &unk_obj.IUnknown_iface, "Got wrong IUnknown pointer\n");
+    ok(unk_obj.ref == 2, "got wrong refcount: %d.\n", unk_obj.ref);
+    hr = PropVariantClear(&propvarDst);
+    ok(hr == S_OK, "PropVariantClear(...VT_UNKNOWN...) failed: 0x%08x.\n", hr);
+    ok(unk_obj.ref == 1, "got wrong refcount: %d.\n", unk_obj.ref);
+    memset(&propvarSrc, 0, sizeof(propvarSrc));
 }
 
 struct _PMemoryAllocator_vtable {