comctl32: Test the WM_GETTEXT processing of datetime control.

dlls/comctl32/tests/datetime.c

@@ -659,7 +659,7 @@ static void test_dtm_set_and_get_system_time(void)
 static void test_wm_set_get_text(void)
 {
     static const CHAR a_str[] = "a";
-    char buff[10];
+    char buff[16], time[16];
     HWND hWnd;
     LRESULT ret;
 
@@ -674,6 +674,10 @@ static void test_wm_set_get_text(void)
     ret = SendMessage(hWnd, WM_GETTEXT, sizeof(buff), (LPARAM)buff);
     ok(strcmp(buff, a_str) != 0, "Expected text not to change, got %s\n", buff);
 
+    GetDateFormat(LOCALE_USER_DEFAULT, 0, NULL, NULL, time, sizeof(time));
+    todo_wine
+        ok(!strcmp(buff, time), "Expected %s, got %s\n", time, buff);
+
     DestroyWindow(hWnd);
 }