Implement unit tests for Blackjack Java

10_Blackjack/java/test/DeckTest.java

@@ -0,0 +1,40 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertAll;
+import org.junit.jupiter.api.Test;
+
+public class DeckTest {
+
+    @Test
+    void testInitOne() {
+        // When
+        Deck deck = new Deck(1);
+
+        // Then
+        long nCards = deck.size();
+        long nSuits = deck.getCards().stream()
+                .map(card -> card.getSuit())
+                .distinct()
+                .count();
+        long nValues = deck.getCards().stream()
+                .map(card -> card.getValue())
+                .distinct()
+                .count();
+
+        assertAll("deck",
+            () -> assertEquals(52, nCards, "Expected 52 cards in a deck, but got " + nCards),
+            () -> assertEquals(4, nSuits, "Expected 4 suits, but got " + nSuits),
+            () -> assertEquals(13, nValues, "Expected 13 values, but got " + nValues)
+        );
+        
+    }
+
+    @Test
+    void testInitTwo() {
+        // When
+        Deck deck = new Deck(2);
+
+        // Then
+        assertEquals(104, deck.size());
+    }
+    
+}