diff --git a/src/test/java/local/Casino/Account/AccountTest.java b/src/test/java/local/Casino/Account/AccountTest.java
new file mode 100644
index 0000000..c262363
--- /dev/null
+++ b/src/test/java/local/Casino/Account/AccountTest.java
@@ -0,0 +1,47 @@
+package local.Casino.Account;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class AccountTest {
+ 
+    private Account account;
+    
+    @BeforeEach
+    public void setUp() {
+        int ID = 1;
+        String username = "testuser";
+        account = new Account(ID, username);
+    }
+    
+    @Test
+    public void testGetBalance() {
+        double expectedBalance = 0.0;
+        double actualBalance = account.getBalance();
+        Assertions.assertEquals(expectedBalance, actualBalance);
+    }
+    
+    @Test
+    public void testGetUsername() {
+        String expectedUsername = "testuser";
+        String actualUsername = account.getUsername();
+        Assertions.assertEquals(expectedUsername, actualUsername);
+    }
+    
+    @Test
+    public void testIncreaseBalance() {
+        double increment = 100.0;
+        double expectedBalance = 100.0;
+        double actualBalance = account.increaseBalance(increment);
+        Assertions.assertEquals(expectedBalance, actualBalance);
+    }
+    
+    @Test
+    public void testDecreaseBalance() {
+        double decrement = 50.0;
+        double expectedBalance = -50.0;
+        double actualBalance = account.decreaseBalance(decrement);
+        Assertions.assertEquals(expectedBalance, actualBalance);
+    }
+
+}
diff --git a/src/test/java/local/Casino/Account/Transaction/DepositTest.java b/src/test/java/local/Casino/Account/Transaction/DepositTest.java
new file mode 100644
index 0000000..e4c2a04
--- /dev/null
+++ b/src/test/java/local/Casino/Account/Transaction/DepositTest.java
@@ -0,0 +1,5 @@
+package local.Casino.Account.Transaction;
+
+public class DepositTest {
+
+}
diff --git a/src/test/java/local/Casino/Account/Transaction/PaymentTest.java b/src/test/java/local/Casino/Account/Transaction/PaymentTest.java
new file mode 100644
index 0000000..fa6ea46
--- /dev/null
+++ b/src/test/java/local/Casino/Account/Transaction/PaymentTest.java
@@ -0,0 +1,21 @@
+package local.Casino.Account.Transaction;
+import local.Casino.Account.Account;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class PaymentTest {
+
+    private Account sender;
+    private Account receiver;
+    @BeforeEach
+    public void setUp() {
+        sender = new Account(1, "sender");
+        receiver = new Account(2, "receiver");
+        int amountSent = 100;
+        new Payment(amountSent, sender, receiver);
+    }
+
+    @Test
+    public void testConstructor() {
+    }
+}
diff --git a/src/test/java/local/Casino/Account/Transaction/TransactionTest.java b/src/test/java/local/Casino/Account/Transaction/TransactionTest.java
new file mode 100644
index 0000000..7d9c5a3
--- /dev/null
+++ b/src/test/java/local/Casino/Account/Transaction/TransactionTest.java
@@ -0,0 +1,5 @@
+package local.Casino.Account.Transaction;
+
+public class TransactionTest {
+
+}
diff --git a/src/test/java/local/Casino/Account/Transaction/WithdrawalTest.java b/src/test/java/local/Casino/Account/Transaction/WithdrawalTest.java
new file mode 100644
index 0000000..9f86ed8
--- /dev/null
+++ b/src/test/java/local/Casino/Account/Transaction/WithdrawalTest.java
@@ -0,0 +1,20 @@
+package local.Casino.Account.Transaction;
+import local.Casino.Account.Account;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class WithdrawalTest {
+
+    private Account sender;
+
+    @BeforeEach
+    public void setUp() {
+        sender = new Account(1, "sender");
+        int amountSent = 100;
+        withdrawal = new Withdrawal(amountSent, sender);
+    }
+
+    @Test
+    public void testConstructor() {
+    }
+}
diff --git a/src/test/java/local/Casino/CardGames/CardTest.java b/src/test/java/local/Casino/CardGames/CardTest.java
new file mode 100644
index 0000000..af12a30
--- /dev/null
+++ b/src/test/java/local/Casino/CardGames/CardTest.java
@@ -0,0 +1,30 @@
+package local.Casino.CardGames;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class CardTest {
+
+    @Test
+    public void testToString() {
+        Card card = new Card(Card.Value.ACE, Card.Suit.SPADES);
+        String expected = "Ace of Spades";
+        String actual = card.toString();
+        Assertions.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testToString_InvalidSuit() {
+        Card card = new Card(Card.Value.TWO, null);
+        String expected = "INVALID SUIT of Two";
+        String actual = card.toString();
+        Assertions.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testToString_InvalidValue() {
+        Card card = new Card(null, Card.Suit.HEARTS);
+        String expected = "INVALID VALUE of Hearts";
+        String actual = card.toString();
+        Assertions.assertEquals(expected, actual);
+    }
+}
diff --git a/src/test/java/local/Casino/CardGames/DeckTest.java b/src/test/java/local/Casino/CardGames/DeckTest.java
new file mode 100644
index 0000000..eba6d78
--- /dev/null
+++ b/src/test/java/local/Casino/CardGames/DeckTest.java
@@ -0,0 +1,45 @@
+package local.Casino.CardGames;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class DeckTest {
+
+    private Deck deck;
+
+    @BeforeEach
+    public void setUp() {
+        deck = new Deck();
+    }
+
+    @Test
+    public void testResetDeck() {
+        deck.shuffle();
+        deck.resetDeck();
+        Assertions.assertEquals(52, deck.mainDeck.length);
+    }
+
+    @Test
+    public void testShuffle() {
+        Card[] initialDeck = deck.mainDeck.clone();
+        deck.shuffle();
+
+        Assertions.assertNotEquals(initialDeck, deck.mainDeck);
+    }
+
+    @Test
+    public void testDeal() {
+        Card card = deck.deal();
+        Assertions.assertNotNull(card);
+        Assertions.assertEquals(51, deck.mainDeck.length);
+    }
+
+    @Test
+    public void testDeal_EmptyDeck() {
+        for (int i = 0; i < 52; i++) {
+            deck.deal();
+        }
+        Card card = deck.deal();
+        Assertions.assertNull(card);
+    }
+}
diff --git a/src/test/java/local/Casino/CasinoTest.java b/src/test/java/local/Casino/CasinoTest.java
new file mode 100644
index 0000000..e98eb07
--- /dev/null
+++ b/src/test/java/local/Casino/CasinoTest.java
@@ -0,0 +1,53 @@
+package local.Casino;
+import local.Casino.Account.Account;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class CasinoTest {
+
+    private Casino casino;
+
+    @BeforeEach
+    public void setUp() {
+        casino = new Casino(10);
+    }
+
+    @Test
+    public void testCreateAccount() {
+        int result = casino.createAccount("user1");
+        Assertions.assertEquals(0, result);
+        Assertions.assertNotNull(casino.getAccount("user1"));
+    }
+
+    @Test
+    public void testCreateAccount_MaxAccountsReached() {
+        for (int i = 0; i < 10; i++) {
+            casino.createAccount("user" + i);
+        }
+        int result = casino.createAccount("user11");
+        Assertions.assertEquals(1, result);
+        Assertions.assertNull(casino.getAccount("user11"));
+    }
+
+    @Test
+    public void testCreateAccount_InvalidUsername() {
+        casino.createAccount("user1");
+        int result = casino.createAccount("user1");
+        Assertions.assertEquals(2, result);
+    }
+
+    @Test
+    public void testGetAccount() {
+        casino.createAccount("user1");
+        Account account = casino.getAccount("user1");
+        Assertions.assertNotNull(account);
+        Assertions.assertEquals("user1", account.getUsername());
+    }
+
+    @Test
+    public void testGetAccount_NonexistentUsername() {
+        Account account = casino.getAccount("user1");
+        Assertions.assertNull(account);
+    }
+}
diff --git a/src/test/java/local/Casino/Slots/SlotsTest.java b/src/test/java/local/Casino/Slots/SlotsTest.java
new file mode 100644
index 0000000..d677eb8
--- /dev/null
+++ b/src/test/java/local/Casino/Slots/SlotsTest.java
@@ -0,0 +1,26 @@
+package local.Casino.Slots;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import local.Casino.Slots.Slots.Symbol;
+
+public class SlotsTest {
+
+    @Test
+    public void testGetWinnings_NoWinningCombination() {
+        Symbol[] rolls = {Symbol.LEMON, Symbol.WATERMELON, Symbol.HEART};
+        double bet = 10.0;
+        double expectedWinnings = 0.0;
+        double actualWinnings = Slots.getWinnings(rolls, bet);
+        Assertions.assertEquals(expectedWinnings, actualWinnings);
+    }
+
+  @Test
+  public void testPlaySlots() {
+      Symbol[] rolls = Slots.playSlots();
+      Assertions.assertEquals(Slots.NUMBER_OF_ROLLS, rolls.length);
+  
+      for (Symbol symbol : rolls) {
+          Assertions.assertNotNull(symbol);
+      }
+  }
+}