diff --git a/src/test/c/test_VierGewinnt.c b/src/test/c/test_VierGewinnt.c
index efe7a13..1f14b9f 100644
--- a/src/test/c/test_VierGewinnt.c
+++ b/src/test/c/test_VierGewinnt.c
@@ -135,3 +135,17 @@ char board[6][7] = {
     TEST_ASSERT_EQUAL_INT(0, checkWin(board, 'X'));  // Kein Gewinner, horizontale Reihe ist voll
     TEST_ASSERT_EQUAL_INT(0, checkWin(board, 'O'));  // Kein Gewinner, horizontale Reihe ist voll
 }
+
+void test_isColumnFull(void) {
+    char board[6][7] = {
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'},
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'},
+        {'X', 'O', 'X', 'O', 'X', 'O', 'X'},
+        {'O', 'X', 'O', 'X', 'O', 'X', 'O'}
+    };
+
+    TEST_ASSERT_EQUAL_INT(1, isColumnFull(board, 3));  // Column 3 is full
+}
+