diff --git a/test/test_tictactoe.c b/test/test_tictactoe.c
index 0609053..fdca226 100644
--- a/test/test_tictactoe.c
+++ b/test/test_tictactoe.c
@@ -34,19 +34,6 @@ void test_if_identical(void){
     TEST_ASSERT_EQUAL_CHAR(a, result);
 }
 
-void test_checkLine_horizontalerGewinner(void) {
-    /* arrange */
-    char result;
-    char a = 'X', b = 'X', c = 'X';
-
-    /* assert */
-    result = checkLine(a, b, c);
-
-    /* überprüfen */
-    TEST_ASSERT_EQUAL_CHAR('X', result);
-}
-
-
 void test_isValidMove_gueltigerZug(void) {
     /* arrangieren */
     int result;
@@ -84,4 +71,28 @@ void test_checkWinner_vertikalerGewinner(void) {
     TEST_ASSERT_EQUAL_CHAR('O', result);
 }
 
+void test_checkWinner_horizontalerGewinner(void) {
+    /* arrangieren */
+    char result;
+    char board[3][3];
+
+    // Initialisiere das Spielfeld
+    for (int i = 0; i < BOARD_SIZE; i++) {
+        for (int j = 0; j < BOARD_SIZE; j++) {
+            board[i][j] = (char)('1' + i * BOARD_SIZE + j);
+        }
+    }
+
+    // Setze die Daten für einen horizontalen Gewinner
+    board[0][0] = 'X';
+    board[0][1] = 'X';
+    board[0][2] = 'X';
+
+    /* handeln */
+    result = checkWinner();
+
+    /* überprüfen */
+    TEST_ASSERT_EQUAL_CHAR('X', result);
+}
+
 #endif // TEST