diff --git a/src/TicTacToe.h b/src/TicTacToe.h
index d7a57e0..fe0ba58 100644
--- a/src/TicTacToe.h
+++ b/src/TicTacToe.h
@@ -2,5 +2,6 @@
 #define TICTACTOE_H
 
 int switchPlayer(int currentPlayer);
+int checkForWin(int pos1, int pos2, int pos3, int pos4, int pos5, int pos6, int pos7, int pos8, int pos9, int currentPlayer);
 
 #endif // TICTACTOE_H
\ No newline at end of file
diff --git a/test/test_tictactoe.c b/test/test_tictactoe.c
index 17dc2a5..bbee7bf 100644
--- a/test/test_tictactoe.c
+++ b/test/test_tictactoe.c
@@ -16,4 +16,10 @@ void test_switchPlayer_10_to_11(void) {
     TEST_ASSERT(switchPlayer(10) == 11);
 }
 
+// Testfall für die Funktion checkForWin - Horizontaler Sieg
+void test_CheckForWin_Horizontal_1_2_3(void) {
+    // Teste horizontalen Sieg in der ersten Zeile
+    TEST_ASSERT(checkForWin(10, 10, 10, 4, 5, 6, 7, 8, 9, 10) == 1);
+}
+
 #endif // TEST
\ No newline at end of file