Add test for card manager

.idea/uiDesigner.xml

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+    </group>
+  </component>
+</project>
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src/Test/cardDealTest.java

+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+
+/**
+ * These testcases test behavior of many functions, includes
+ * 1. All functions in CardManager
+ * 2. Interaction between Game and CardManager
+ * 3. Player.{drawCards, playOneRound}
+ */
+class cardDealTest {
+
+    @Test
+    /**
+     * Test card manager can initialize 108 cards correctly
+     */
+    void testInitialization()  throws Exception {
+        CardManager cardManager = new CardManager();
+        assert(cardManager.getCardPile().size() == 108);
+        for (int i = 1; i <= 108; i++) {
+            assert (cardManager.getCardPile().contains(i));
+        }
+    }
+
+    @Test
+    /**
+     * Given n players, test behavior of initial deal, as well as behavior of draw pile
+     * dependencies: Player.drawCards, CardManager.*
+     */
+    void testInitialDeal()  throws Exception {
+
+        Game game1 = new Game(1);
+        for (Player p : game1.players) {
+            assert(p.getCards().size() == 7);
+        }
+        assert(game1.gameCardManager.numCardLeft() == 101); // 108 - 7
+
+        Game game2 = new Game(5);
+        for (Player p : game2.players) {
+            assert(p.getCards().size() == 7);
+        }
+        assert(game2.gameCardManager.numCardLeft() == 73); // 108 - 35
+
+        Game game3 = new Game(10);
+        for (Player p : game3.players) {
+            assert(p.getCards().size() == 7);
+        }
+        assert(game3.gameCardManager.numCardLeft() == 38); // 108 - 70
+    }
+
+
+    @Test
+    /**
+     * Test the behavior of Player.drawCards
+     * under the condition where draw pile is not enough to draw, should draw from discard pile instead
+     * case 1: completely draw from discard pile
+     */
+    void testDrawFromDiscardWhenDrawNotEnough_Case1()  throws Exception {
+        Game game = new Game(1);
+        Player player = game.players.get(0);
+        ArrayList<Integer> cards = player.getCards(); // direct reference to player's card
+        player.drawCards(game.gameCardManager.numCardLeft()); // get all cards in draw pile
+        assert(game.gameCardManager.numCardLeft() == 0);
+
+        // move 30 cards from players' to discard
+        for (int i = 0; i < 30; i++) {
+            int cardID = cards.get(0);
+            cards.remove(0);
+            game.gameCardManager.insertOneCardToDiscardPile(cardID);
+        }
+        assert(game.gameCardManager.numLeftDiscardPile() == 30);
+
+        // then drawCards
+        player.drawCards(4);
+        assert(game.gameCardManager.numLeftDiscardPile() == 26);
+    }
+
+    @Test
+    /**
+     * Test the behavior of Player.drawCards
+     * under the condition where draw pile is not enough to draw, should draw from discard pile instead
+     * case 2: partially from draw pile, partially from discard pile
+     */
+    void testDrawFromDiscardWhenDrawNotEnough_Case2() throws Exception{
+        Game game = new Game(1);
+        Player player = game.players.get(0);
+        ArrayList<Integer> cards = player.getCards(); // direct reference to player's card
+        player.drawCards(game.gameCardManager.numCardLeft() - 2); // get 99 cards from draw pile
+        assert(game.gameCardManager.numCardLeft() == 2);
+
+        // move 30 cards from players' to discard
+        for (int i = 0; i < 30; i++) {
+            int cardID = cards.get(0);
+            cards.remove(0);
+            game.gameCardManager.insertOneCardToDiscardPile(cardID);
+        }
+        assert(game.gameCardManager.numLeftDiscardPile() == 30);
+
+        // 2 from discard, 2 from draw
+        player.drawCards(4);
+        assert(game.gameCardManager.numCardLeft() == 0);
+        assert(game.gameCardManager.numLeftDiscardPile() == 28);
+    }
+
+
+
+}
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