diff --git a/src/test/test_duellist_spielesammlung_projekt.c b/src/test/test_duellist_spielesammlung_projekt.c
index b990cfe..1d3c97e 100644
--- a/src/test/test_duellist_spielesammlung_projekt.c
+++ b/src/test/test_duellist_spielesammlung_projekt.c
@@ -89,8 +89,33 @@ void test_valid_move_and_switch_player(void) {
 }
 
 
+void test_invalid_input(void) {
+    // Arrange
+    TicTacToeGame game = { .board = {{PLAYER_X, EMPTY, EMPTY},
+                                     {EMPTY, EMPTY, EMPTY},
+                                     {EMPTY, EMPTY, EMPTY}},
+                          .currentPlayer = PLAYER_O };
+
+    // Act
+    GameResult result = makeMove(&game, 0, 0);
+
+    // Assert
+    TEST_ASSERT_EQUAL(INVALID_MOVE, result);
+}
 
+void test_valid_input(void) {
+    // Arrange
+    TicTacToeGame game = { .board = {{EMPTY, EMPTY, EMPTY},
+                                     {EMPTY, EMPTY, EMPTY},
+                                     {EMPTY, EMPTY, EMPTY}},
+                          .currentPlayer = PLAYER_X };
 
+    // Act
+    GameResult result = makeMove(&game, 1, 1);
+
+    // Assert
+    TEST_ASSERT_EQUAL(SUCCESS, result);
+}