diff --git a/test/test_tictactoe.c b/test/test_tictactoe.c
index d7ba005..e1453e5 100644
--- a/test/test_tictactoe.c
+++ b/test/test_tictactoe.c
@@ -54,4 +54,9 @@ void test_CheckForWin_Diagonal_Right_To_Left(void) {
     TEST_ASSERT(checkForWin(10, 2, 3, 4, 10, 6, 7, 8, 10, 10) == 1);
 }
 
+void test_CheckForWin_Diagonal_Left_To_Right(void) {
+    // Teste diagonalen Sieg von rechts oben nach links unten
+    TEST_ASSERT(checkForWin(1, 2, 11, 4, 11, 6, 11, 8, 9, 11) == 1);
+}
+
 #endif // TEST
\ No newline at end of file