unittest: testSubtractGold()

src/main/java/org/bitbiome/shop/Shop.java

@@ -233,7 +233,7 @@ public class Shop {
         System.out.println("");
     }
 
-    private int subtractGold(int gold, int cost){
+    public int subtractGold(int gold, int cost){
         return gold - cost;
     }
 }

src/test/java/org/bitbiome/commands/ShopCommandTest.java

@@ -7,6 +7,7 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class ShopCommandTest {
     final ShopCommand shopCommand = new ShopCommand();
+    final Shop shop = new Shop();
     @Test
     public void testValidInput1(){
         boolean expected = true;
@@ -31,4 +32,13 @@ public class ShopCommandTest {
         boolean result = shopCommand.validInput("4");
         assertEquals(expected, result);
     }
+
+
+
+    @Test
+    public void testSubtractGold(){
+        int expected = 1;
+        int result = shop.subtractGold(3, 2);
+        assertEquals(expected, result);
+    }
 }