feat: implemented Saving account and BusinessCheckingAccount functions and tests lesson17

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

@@ -18,6 +18,15 @@ public class BankAtm {
    * @param account The account to add.
    */
   public void addAccount(CheckingAccount account) {
+    if (account instanceof BusinessCheckingAccount) {
+      // Check if at least one of the owners is a business customer
+      boolean hasBusinessOwner = account.getOwners().stream().anyMatch(Customer::isBusiness);
+
+      if (!hasBusinessOwner) {
+        throw new IllegalArgumentException(
+            "At least one owner must be a business customer for a BusinessCheckingAccount.");
+      }
+    }
     accountByNumber.put(account.getAccountNumber(), account);
     account
         .getOwners()

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

@@ -0,0 +1,5 @@
+package com.codedifferently.lesson17.bank;
+
+public interface BusinessAccount {
+  boolean isBusiness();
+}

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

@@ -0,0 +1,15 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.Set;
+
+public class BusinessCheckingAccount extends CheckingAccount implements BusinessAccount {
+
+  public BusinessCheckingAccount(String accountNumber, Set<Customer> owners, double balance) {
+    super(accountNumber, owners, balance);
+  }
+
+  @Override
+  public boolean isBusiness() {
+    return true;
+  }
+}

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

@@ -7,7 +7,7 @@
 public class CheckingAccount {
 
   private final Set<Customer> owners;
-  private final String accountNumber;
+  final String accountNumber;
   private double balance;
   private boolean isActive;
 

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

@@ -9,6 +9,7 @@ public class Customer {
 
   private final UUID id;
   private final String name;
+  private final boolean isBusiness;
   private final Set<CheckingAccount> accounts = new HashSet<>();
 
   /**
@@ -17,9 +18,10 @@ public class Customer {
    * @param id The ID of the customer.
    * @param name The name of the customer.
    */
-  public Customer(UUID id, String name) {
+  public Customer(UUID id, String name, boolean isBusiness) {
     this.id = id;
     this.name = name;
+    this.isBusiness = isBusiness;
   }
 
   /**
@@ -31,6 +33,10 @@ public UUID getId() {
     return id;
   }
 
+  public boolean isBusiness() {
+    return isBusiness;
+  }
+
   /**
    * Gets the name of the customer.
    *

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

@@ -0,0 +1,131 @@
+package com.codedifferently.lesson17.bank;
+
+import com.codedifferently.lesson17.bank.exceptions.InsufficientFundsException;
+import java.util.Set;
+
+/** Represents a saving account. */
+public class SavingAccount {
+
+  private final Set<Customer> owners;
+  final String accountNumber;
+  private double balance;
+  private boolean isActive;
+
+  /**
+   * Creates a new saving account.
+   *
+   * @param accountNumber The account number.
+   * @param owners The owners of the account.
+   * @param initialBalance The initial balance of the account.
+   */
+  public SavingAccount(String accountNumber, Set<Customer> owners, double initialBalance) {
+    this.accountNumber = accountNumber;
+    this.owners = owners;
+    this.balance = initialBalance;
+    isActive = true;
+  }
+
+  /**
+   * Gets the account number.
+   *
+   * @return The account number.
+   */
+  public String getAccountNumber() {
+    return accountNumber;
+  }
+
+  /**
+   * Gets the owners of the account.
+   *
+   * @return The owners of the account.
+   */
+  public Set<Customer> getOwners() {
+    return owners;
+  }
+
+  /**
+   * Deposits funds into the account.
+   *
+   * @param amount The amount to deposit.
+   */
+  public void deposit(double amount) throws IllegalStateException {
+    if (isClosed()) {
+      throw new IllegalStateException("Cannot deposit to a closed account");
+    }
+    if (amount <= 0) {
+      throw new IllegalArgumentException("Deposit amount must be positive");
+    }
+    balance += amount;
+  }
+
+  /**
+   * Withdraws funds from the account.
+   *
+   * @param amount
+   * @throws InsufficientFundsException
+   */
+  public void withdraw(double amount) throws InsufficientFundsException {
+    if (isClosed()) {
+      throw new IllegalStateException("Cannot withdraw from a closed account");
+    }
+    if (amount <= 0) {
+      throw new IllegalStateException("Withdrawal amount must be positive");
+    }
+    if (balance < amount) {
+      throw new InsufficientFundsException("Account does not have enough funds for withdrawal");
+    }
+    balance -= amount;
+  }
+
+  /**
+   * Gets the balance of the account.
+   *
+   * @return The balance of the account.
+   */
+  public double getBalance() {
+    return balance;
+  }
+
+  /** Closes the account. */
+  public void closeAccount() throws IllegalStateException {
+    if (balance > 0) {
+      throw new IllegalStateException("Cannot close account with a positive balance");
+    }
+    isActive = false;
+  }
+
+  /**
+   * Checks if the account is closed.
+   *
+   * @return True if the account is closed, otherwise false.
+   */
+  public boolean isClosed() {
+    return !isActive;
+  }
+
+  @Override
+  public int hashCode() {
+    return accountNumber.hashCode();
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (obj instanceof SavingAccount other) {
+      return accountNumber.equals(other.accountNumber);
+    }
+    return false;
+  }
+
+  @Override
+  public String toString() {
+    return "SavingAccount{"
+        + "accountNumber='"
+        + accountNumber
+        + '\''
+        + ", balance="
+        + balance
+        + ", isActive="
+        + isActive
+        + '}';
+  }
+}

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

@@ -21,8 +21,8 @@ class BankAtmTest {
   @BeforeEach
   void setUp() {
     classUnderTest = new BankAtm();
-    customer1 = new Customer(UUID.randomUUID(), "John Doe");
-    customer2 = new Customer(UUID.randomUUID(), "Jane Smith");
+    customer1 = new Customer(UUID.randomUUID(), "John Doe", false);
+    customer2 = new Customer(UUID.randomUUID(), "Jane Smith", false);
     account1 = new CheckingAccount("123456789", Set.of(customer1), 100.0);
     account2 = new CheckingAccount("987654321", Set.of(customer1, customer2), 200.0);
     customer1.addAccount(account1);
@@ -35,7 +35,7 @@ void setUp() {
   @Test
   void testAddAccount() {
     // Arrange
-    Customer customer3 = new Customer(UUID.randomUUID(), "Alice Johnson");
+    Customer customer3 = new Customer(UUID.randomUUID(), "Alice Johnson", false);
     CheckingAccount account3 = new CheckingAccount("555555555", Set.of(customer3), 300.0);
     customer3.addAccount(account3);
 

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

@@ -20,8 +20,8 @@ class CheckingAccountTest {
   @BeforeEach
   void setUp() {
     owners = new HashSet<>();
-    owners.add(new Customer(UUID.randomUUID(), "John Doe"));
-    owners.add(new Customer(UUID.randomUUID(), "Jane Smith"));
+    owners.add(new Customer(UUID.randomUUID(), "John Doe", false));
+    owners.add(new Customer(UUID.randomUUID(), "Jane Smith", false));
     classUnderTest = new CheckingAccount("123456789", owners, 100.0);
   }
 

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

@@ -0,0 +1,106 @@
+package com.codedifferently.lesson17.bank;
+
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import com.codedifferently.lesson17.bank.exceptions.InsufficientFundsException;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class SavingAccountTest {
+
+  private SavingAccount classUnderTest;
+  private Set<Customer> owners;
+
+  @BeforeEach
+  void setUp() {
+    owners = new HashSet<>();
+    owners.add(new Customer(UUID.randomUUID(), "John Doe", false));
+    owners.add(new Customer(UUID.randomUUID(), "Jane Smith", false));
+    classUnderTest = new SavingAccount("123456789", owners, 100.0);
+  }
+
+  @Test
+  void getAccountNumber() {
+    assertEquals("123456789", classUnderTest.getAccountNumber());
+  }
+
+  @Test
+  void getOwners() {
+    assertEquals(owners, classUnderTest.getOwners());
+  }
+
+  @Test
+  void deposit() {
+    classUnderTest.deposit(50.0);
+    assertEquals(150.0, classUnderTest.getBalance());
+  }
+
+  @Test
+  void deposit_withNegativeAmount() {
+    assertThatExceptionOfType(IllegalArgumentException.class)
+        .isThrownBy(() -> classUnderTest.deposit(-50.0));
+  }
+
+  @Test
+  void withdraw() {
+    classUnderTest.withdraw(50.0);
+    assertEquals(50.0, classUnderTest.getBalance());
+  }
+
+  @Test
+  void withdraw_withNegativeAmount() {
+    assertThatExceptionOfType(IllegalStateException.class)
+        .isThrownBy(() -> classUnderTest.withdraw(-50.0))
+        .withMessage("Withdrawal amount must be positive");
+  }
+
+  @Test
+  void withdraw_withInsufficientBalance() {
+    assertThatExceptionOfType(InsufficientFundsException.class)
+        .isThrownBy(() -> classUnderTest.withdraw(150.0))
+        .withMessage("Account does not have enough funds for withdrawal");
+  }
+
+  @Test
+  void getBalance() {
+    assertEquals(100.0, classUnderTest.getBalance());
+  }
+
+  @Test
+  void closeAccount_withPositiveBalance() {
+    assertThatExceptionOfType(IllegalStateException.class)
+        .isThrownBy(() -> classUnderTest.closeAccount());
+  }
+
+  @Test
+  void isClosed() {
+    assertFalse(classUnderTest.isClosed());
+    classUnderTest.withdraw(100);
+    classUnderTest.closeAccount();
+    assertTrue(classUnderTest.isClosed());
+  }
+
+  @Test
+  void equals() {
+    SavingAccount otherAccount = new SavingAccount("123456789", owners, 200.0);
+    assertEquals(classUnderTest, otherAccount);
+  }
+
+  @Test
+  void hashCodeTest() {
+    SavingAccount otherAccount = new SavingAccount("123456789", owners, 200.0);
+    assertEquals(classUnderTest.hashCode(), otherAccount.hashCode());
+  }
+
+  @Test
+  void toStringTest() {
+    String expected = "SavingAccount{accountNumber='123456789', balance=100.0, isActive=true}";
+    assertEquals(expected, classUnderTest.toString());
+  }
+}