added buyItem with test

src/c/player.c

@@ -71,6 +71,25 @@ Player removeMoneyFromPlayer(Player actualPlayer, int money)
     return actualPlayer;
 }
 
+//add and remove items with currency
+Player buyItem(Item *availableItems, int itemIndex, Player actualPlayer)
+{
+    int itemPrice = availableItems[itemIndex - 1].price;
+    if (actualPlayer.wallet >= itemPrice)
+    {
+        actualPlayer = addItemToInventory(availableItems, itemIndex, actualPlayer);
+        actualPlayer = removeMoneyFromPlayer(actualPlayer, itemPrice);
+        printf("You bought item for %d$! Your balance is now: %d$\n", itemPrice, actualPlayer.wallet);
+        return actualPlayer;
+    }
+    else
+    {
+        printf("You don't have enough money.\n\n");
+        return actualPlayer;
+    }
+}
+
+
 // show
 void showInventory(Player actualPlayer)
 {

src/c/player.h

@@ -20,6 +20,9 @@ Player setTotal(Player actualPlayer, int value);
 Player addMoneyToPlayer(Player actualPlayer, int money);
 Player removeMoneyFromPlayer(Player actualPlayer, int money);
 
+//add and remove items with currency
+Player buyItem(Item *availableItems, int itemIndex, Player actualPlayer);
+
 //show
 void showInventory(Player actualPlayer);
 

test/c/test_player.c

@@ -111,7 +111,23 @@ void test_removeMoneyFromPlayer(void)
     TEST_ASSERT_EQUAL_INT(checkSum, actualPlayer.wallet);
 }
 
+void test_buyItem(void)
+{
+    /* arrange */
+    // Hier die Werte eingeben/deklarieren
+    int itemIndex = 2; // price = 50
+    int checkSum = actualPlayer.wallet - availableItems[itemIndex-1].price;
+
+    /* act */
+    // Die Funktion wird ausgeführt
+    actualPlayer = buyItem(availableItems, itemIndex, actualPlayer);
 
+    /* assert */
+    // Vergleichen mit Inhalt von game.Map File
+    TEST_ASSERT_EQUAL_INT(itemIndex, actualPlayer.itemInventory[0].id); //check if item has right ID
+    TEST_ASSERT_EQUAL_INT(checkSum, actualPlayer.wallet); //check money after transfer
+
+}
 
 
 #endif // TEST