diff --git a/src/test/c/test_VierGewinnt.c b/src/test/c/test_VierGewinnt.c
index 8ad593b..f487364 100644
--- a/src/test/c/test_VierGewinnt.c
+++ b/src/test/c/test_VierGewinnt.c
@@ -43,7 +43,18 @@ void test_checkWin_Horizontal_X(void) {
     TEST_ASSERT_EQUAL_INT(1, checkWin(board, 'X'));  // Horizontale Gewinnsituation für 'X'
 }
 
+void test_checkWin_Horizontal_O(void) {
+    char board[6][7] = {
+        {'X', 'X', ' ', ' ', ' ', ' ', ' '},
+        {'O', 'O', 'O', 'O', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '},
+        {' ', 'X', 'X', ' ', 'X', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '},
+        {' ', ' ', ' ', ' ', ' ', ' ', ' '}
+    };
 
+    TEST_ASSERT_EQUAL_INT(1, checkWin(board, 'O'));  // Horizontale Gewinnsituation für 'X'
+}