Added more lambda functions

src/test/java/no/ntnu/idatt2001/cardgame/CardHandTest.java

@@ -22,12 +22,12 @@ class CardHandTest {
     public void isFlushTest() {
         // Flush
         CardHand hand = new CardHand();
-        IntStream.range(0,5).mapToObj(i -> new PlayingCard('D', i +1 )).forEach(e -> hand.addCard(e));
+        IntStream.range(0,5).mapToObj(i -> new PlayingCard('D', i +1 )).forEach(hand::addCard);
         assertTrue(hand.flush());
 
         // Not Flush
         CardHand hand2 = new CardHand();
-        IntStream.range(0,4).mapToObj(i -> new PlayingCard('D', i +1 )).forEach(e -> hand2.addCard(e));
+        IntStream.range(0,4).mapToObj(i -> new PlayingCard('D', i +1 )).forEach(hand2::addCard);
         hand.addCard(new PlayingCard('S', 5));
         assertFalse(hand2.flush());
     }
@@ -40,7 +40,7 @@ class CardHandTest {
         assertEquals(0, hand.getCardSum());
 
         // Ace - King => 1+2+3+...+13
-        IntStream.range(0,13).mapToObj(i -> new PlayingCard('D', i +1 )).forEach(e -> hand.addCard(e));
+        IntStream.range(0,13).mapToObj(i -> new PlayingCard('D', i +1 )).forEach(hand::addCard);
         int total = 1+2+3+4+5+6+7+8+9+10+11+12+13;
         assertEquals(total, hand.getCardSum());
     }
@@ -71,7 +71,7 @@ class CardHandTest {
         // Filter the card arraylist and get all diamonds. Then map it into an list of strings then collect it and make a string from the list
         String diamonds = cards.stream().filter(c -> c.getSuit() == 'D').map(c -> c.getSuit() + "").collect(Collectors.joining(""));
 
-        // Get filtered arraylist with just diamond cards from hand. Then map so we get a list of just the suits in string and then make it into a string
+        // Get filtered arraylist with just diamond cards from hand. Then use map so we get a list of just the suits in list of strings. Then make it into a string
         String diamondsFromHand = hand.getAllWithSuit("D").stream().map(c -> c.getSuit() + "").collect(Collectors.joining(""));
 
         // Check if strings are equal. This means equal length and same characters. E.g "DDDD" === "DDDD" -> true