oledb32/tests: Test converting DBTYPE_VARIANT to DBTYPE_VARIANT.

dlls/oledb32/tests/convert.c

@@ -3943,6 +3943,21 @@ static void test_converttovar(void)
     ok(dst_status == DBSTATUS_S_ISNULL, "got %08lx\n", dst_status);
     ok(dst_len == sizeof(VARIANT), "got %Id\n", dst_len);
 
+    dst_len = 44;
+    V_VT(&var) = VT_UINT;
+    V_UINT(&var) = 1234;
+    hr = IDataConvert_DataConvert(convert, DBTYPE_VARIANT, DBTYPE_VARIANT, 0, &dst_len, &var, &dst, sizeof(dst), 0, &dst_status, 0, 0, 0);
+    todo_wine
+    ok(hr == S_OK, "got %08lx\n", hr);
+    todo_wine
+    ok(dst_status == DBSTATUS_S_OK, "got %08lx\n", dst_status);
+    todo_wine
+    ok(dst_len == sizeof(VARIANT), "got %Id\n", dst_len);
+    todo_wine
+    ok(V_VT(&dst) == VT_UINT, "got %d\n", V_VT(&dst));
+    todo_wine
+    ok(V_UINT(&dst) == 1234, "got %u\n", V_UINT(&dst));
+    VariantClear(&dst);
 }
 
 static void test_converttotimestamp(void)