feat: RMiller_lesson_17_adds moneyorder and auditlog ATM simulator

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/AuditLog.java

@@ -0,0 +1,33 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class AuditLog {
+
+  private static final AuditLog INSTANCE = new AuditLog();
+
+  private final List<String> entries;
+
+  private AuditLog() {
+    this.entries = new ArrayList<>();
+  }
+
+  public static AuditLog getInstance() {
+    return INSTANCE;
+  }
+
+  public void log(String type, String accountNumber, double amount) {
+    String entry = String.format("%s - Account: %s, Amount: %.2f", type, accountNumber, amount);
+    entries.add(entry);
+  }
+
+  public List<String> getEntries() {
+    return Collections.unmodifiableList(entries);
+  }
+
+  public void clear() {
+    entries.clear();
+  }
+}

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/BankAtm.java

@@ -11,6 +11,7 @@ public class BankAtm {
 
   private final Map<UUID, Customer> customerById = new HashMap<>();
   private final Map<String, CheckingAccount> accountByNumber = new HashMap<>();
+  private Map<UUID, CheckingAccount> accounts;
 
   /**
    * Adds a checking account to the bank.
@@ -48,6 +49,7 @@ public Set<CheckingAccount> findAccountsByCustomerId(UUID customerId) {
   public void depositFunds(String accountNumber, double amount) {
     CheckingAccount account = getAccountOrThrow(accountNumber);
     account.deposit(amount);
+    AuditLog.getInstance().log("DEPOSIT", account.getAccountNumber(), amount);
   }
 
   /**
@@ -59,6 +61,13 @@ public void depositFunds(String accountNumber, double amount) {
   public void depositFunds(String accountNumber, Check check) {
     CheckingAccount account = getAccountOrThrow(accountNumber);
     check.depositFunds(account);
+    AuditLog.getInstance().log("CHECK DEPOSIT", account.getAccountNumber(), check.getAmount());
+  }
+
+  public void depositFunds(String accountNumber, MoneyOrder mo) {
+    CheckingAccount toAccount = (CheckingAccount) accounts.get(accountNumber); // ✅ must not be null
+    mo.depositFunds(toAccount);
+    AuditLog.getInstance().log("MONEY ORDER DEPOSIT", toAccount.getAccountNumber(), mo.getAmount());
   }
 
   /**
@@ -70,6 +79,7 @@ public void depositFunds(String accountNumber, Check check) {
   public void withdrawFunds(String accountNumber, double amount) {
     CheckingAccount account = getAccountOrThrow(accountNumber);
     account.withdraw(amount);
+    AuditLog.getInstance().log("WITHDRAWAL", account.getAccountNumber(), amount);
   }
 
   /**
@@ -85,4 +95,9 @@ private CheckingAccount getAccountOrThrow(String accountNumber) {
     }
     return account;
   }
+
+  public BankAtm getBank() {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'getBank'");
+  }
 }

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/Check.java

@@ -54,6 +54,10 @@ public void depositFunds(CheckingAccount toAccount) {
     voidCheck();
   }
 
+  public double getAmount() {
+    return amount;
+  }
+
   @Override
   public int hashCode() {
     return checkNumber.hashCode();

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/MoneyOrder.java

@@ -0,0 +1,26 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.UUID;
+
+public class MoneyOrder extends Check {
+
+  public MoneyOrder(CheckingAccount sourceAccount, double amount) {
+    super("MO-" + UUID.randomUUID(), amount, sourceAccount);
+
+    sourceAccount.withdraw(amount);
+
+    AuditLog.getInstance().log("MONEY ORDER ISSUED", sourceAccount.getAccountNumber(), amount);
+  }
+
+  @Override
+  public void depositFunds(CheckingAccount toAccount) {
+    if (getIsVoided()) {
+      throw new RuntimeException("This money order has already been deposited or voided.");
+    }
+
+    toAccount.deposit(getAmount());
+    voidCheck();
+
+    AuditLog.getInstance().log("MONEY ORDER DEPOSIT", toAccount.getAccountNumber(), getAmount());
+  }
+}

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/AuditLogTest.java

@@ -0,0 +1,61 @@
+package com.codedifferently.lesson17.bank;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class AuditLogTest {
+
+  private BankAtm bankAtm;
+  private CheckingAccount sourceAccount;
+  private CheckingAccount targetAccount;
+
+  @BeforeEach
+  void setUp() {
+    AuditLog.getInstance().clear();
+
+    bankAtm = new BankAtm();
+
+    Customer alice = new Customer(UUID.randomUUID(), "Alice");
+    Customer bob = new Customer(UUID.randomUUID(), "Bob");
+
+    Set<Customer> owners1 = Set.of(alice);
+    Set<Customer> owners2 = Set.of(bob);
+
+    sourceAccount = new CheckingAccount("SRC123", owners1, 1000.0);
+    targetAccount = new CheckingAccount("TRG456", owners2, 500.0);
+
+    bankAtm.addAccount(sourceAccount);
+    bankAtm.addAccount(targetAccount);
+  }
+
+  @Test
+  void testAuditLogRecordsStandardDeposit() {
+    bankAtm.depositFunds(targetAccount.getAccountNumber(), 500.0);
+
+    List<String> entries = AuditLog.getInstance().getEntries();
+    assertTrue(entries.stream().anyMatch(e -> e.contains("DEPOSIT") && e.contains("TRG456")));
+  }
+
+  @Test
+  void testAuditLogRecordsStandardWithdrawal() {
+    bankAtm.depositFunds(targetAccount.getAccountNumber(), 200.0);
+    bankAtm.withdrawFunds(targetAccount.getAccountNumber(), 100.0);
+
+    List<String> entries = AuditLog.getInstance().getEntries();
+    assertTrue(entries.stream().anyMatch(e -> e.contains("WITHDRAWAL") && e.contains("TRG456")));
+  }
+
+  @Test
+  void testAuditLogRecordsCheckDeposit() {
+    Check check = new Check("CHK123", 100.0, sourceAccount);
+    bankAtm.depositFunds(targetAccount.getAccountNumber(), check);
+
+    List<String> entries = AuditLog.getInstance().getEntries();
+    assertTrue(entries.stream().anyMatch(e -> e.contains("CHECK DEPOSIT")));
+  }
+}

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/BankAtmTest.java

@@ -17,17 +17,21 @@ class BankAtmTest {
   private CheckingAccount account2;
   private Customer customer1;
   private Customer customer2;
+  private BankAtm BankAtm;
 
   @BeforeEach
   void setUp() {
     classUnderTest = new BankAtm();
+    new BankAtm();
+
     customer1 = new Customer(UUID.randomUUID(), "John Doe");
     customer2 = new Customer(UUID.randomUUID(), "Jane Smith");
     account1 = new CheckingAccount("123456789", Set.of(customer1), 100.0);
     account2 = new CheckingAccount("987654321", Set.of(customer1, customer2), 200.0);
     customer1.addAccount(account1);
     customer1.addAccount(account2);
     customer2.addAccount(account2);
+
     classUnderTest.addAccount(account1);
     classUnderTest.addAccount(account2);
   }
@@ -58,10 +62,8 @@ void testFindAccountsByCustomerId() {
 
   @Test
   void testDepositFunds() {
-    // Act
     classUnderTest.depositFunds(account1.getAccountNumber(), 50.0);
 
-    // Assert
     assertThat(account1.getBalance()).isEqualTo(150.0);
   }
 

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/MoneyOrderTest.java

@@ -0,0 +1,51 @@
+package com.codedifferently.lesson17.bank;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Set;
+import java.util.UUID;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class MoneyOrderTest {
+
+  private CheckingAccount sourceAccount;
+  private CheckingAccount targetAccount;
+
+  @BeforeEach
+  void setUp() {
+    Customer alice = new Customer(UUID.randomUUID(), "Alice");
+    Customer bob = new Customer(UUID.randomUUID(), "Bob");
+
+    sourceAccount = new CheckingAccount("SRC123", Set.of(alice), 0.0);
+    targetAccount = new CheckingAccount("TRG456", Set.of(bob), 0.0);
+
+    sourceAccount.deposit(1000.0);
+  }
+
+  @Test
+  void testMoneyOrderWithdrawsImmediatelyFromSource() {
+    double initialBalance = sourceAccount.getBalance();
+    double amount = 250.0;
+
+    MoneyOrder moneyOrder = new MoneyOrder(sourceAccount, amount);
+
+    assertEquals(initialBalance - amount, sourceAccount.getBalance(), 0.001);
+  }
+
+  @Test
+  void testMoneyOrderCanBeDepositedToAnotherAccount() {
+    double amount = 300.0;
+
+    MoneyOrder moneyOrder = new MoneyOrder(sourceAccount, amount);
+    moneyOrder.depositFunds(targetAccount);
+
+    assertEquals(amount, targetAccount.getBalance(), 0.001);
+  }
+
+  @Test
+  void testMoneyOrderAmountIsCorrect() {
+    MoneyOrder moneyOrder = new MoneyOrder(sourceAccount, 123.45);
+    assertEquals(123.45, moneyOrder.getAmount(), 0.001);
+  }
+}