scrrun/tests: Test to query for IUnknown from IProvideClassInfo.

dlls/scrrun/tests/dictionary.c

@@ -36,6 +36,7 @@ static void _test_provideclassinfo(IDispatch *disp, const GUID *guid, int line)
     IProvideClassInfo *classinfo;
     TYPEATTR *attr;
     ITypeInfo *ti;
+    IUnknown *unk;
     HRESULT hr;
 
     hr = IDispatch_QueryInterface(disp, &IID_IProvideClassInfo, (void **)&classinfo);
@@ -50,6 +51,11 @@ static void _test_provideclassinfo(IDispatch *disp, const GUID *guid, int line)
     ok_(__FILE__,line) (IsEqualGUID(&attr->guid, guid), "Unexpected typeinfo %s, expected %s\n", wine_dbgstr_guid(&attr->guid),
         wine_dbgstr_guid(guid));
 
+    hr = IProvideClassInfo_QueryInterface(classinfo, &IID_IUnknown, (void **)&unk);
+    ok(hr == S_OK, "Failed to QI for IUnknown.\n");
+    ok(unk == (IUnknown *)disp, "Got unk %p, original %p\n", unk, disp);
+    IUnknown_Release(unk);
+
     IProvideClassInfo_Release(classinfo);
     ITypeInfo_ReleaseTypeAttr(ti, attr);
     ITypeInfo_Release(ti);

dlls/scrrun/tests/filesystem.c

@@ -106,6 +106,7 @@ static void _test_provideclassinfo(IDispatch *disp, const GUID *guid, int line)
     IProvideClassInfo *classinfo;
     TYPEATTR *attr;
     ITypeInfo *ti;
+    IUnknown *unk;
     HRESULT hr;
 
     hr = IDispatch_QueryInterface(disp, &IID_IProvideClassInfo, (void **)&classinfo);
@@ -120,6 +121,11 @@ static void _test_provideclassinfo(IDispatch *disp, const GUID *guid, int line)
     ok_(__FILE__,line) (IsEqualGUID(&attr->guid, guid), "Unexpected typeinfo %s, expected %s\n", wine_dbgstr_guid(&attr->guid),
         wine_dbgstr_guid(guid));
 
+    hr = IProvideClassInfo_QueryInterface(classinfo, &IID_IUnknown, (void **)&unk);
+    ok(hr == S_OK, "Failed to QI for IUnknown.\n");
+    ok(unk == (IUnknown *)disp, "Got unk %p, original %p.\n", unk, disp);
+    IUnknown_Release(unk);
+
     IProvideClassInfo_Release(classinfo);
     ITypeInfo_ReleaseTypeAttr(ti, attr);
     ITypeInfo_Release(ti);