feat: adds new enhancement and updates to only have necessary tests

Author: txjackson252

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

@@ -0,0 +1,18 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.Set;
+
+/** Represents a business checking account. Requires at least one owner to be a BusinessCustomer. */
+public class BusinessCheckingAccount extends CheckingAccount {
+
+  public BusinessCheckingAccount(
+      String accountNumber, Set<Customer> owners, double initialBalance) {
+    super(accountNumber, owners, initialBalance);
+
+    boolean hasBusinessOwner = owners.stream().anyMatch(o -> o instanceof BusinessCustomer);
+    if (!hasBusinessOwner) {
+      throw new IllegalArgumentException(
+          "BusinessCheckingAccount requires at least one BusinessCustomer as an owner");
+    }
+  }
+}

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

@@ -0,0 +1,10 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.UUID;
+
+/** Represents a business customer of the bank. */
+public class BusinessCustomer extends Customer {
+  public BusinessCustomer(UUID id, String name) {
+    super(id, name);
+  }
+}

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

@@ -126,4 +126,24 @@ void testWithdrawFunds_AccountNotFound() {
   void testSavingsAccountCannotWriteChecks() {
     assertThat(savingsAccount.canWriteChecks()).isFalse();
   }
+
+  @Test
+  void testDepositFundsIntoSavingsAccountWorks() {
+    // Act
+    classUnderTest.depositFunds(savingsAccount.getAccountNumber(), 200.0);
+
+    // Assert
+    assertThat(savingsAccount.getBalance()).isEqualTo(700.0);
+  }
+
+  @Test
+  void testDepositCheckIntoSavingsAccountFails() {
+    // Arrange
+    Check check = new Check("CHK001", 50.0, (CheckingAccount) account1);
+
+    // Act & Assert
+    assertThatExceptionOfType(IllegalArgumentException.class)
+        .isThrownBy(() -> classUnderTest.depositFunds(savingsAccount.getAccountNumber(), check))
+        .withMessage("Can only deposit checks into checking accounts");
+  }
 }

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

@@ -0,0 +1,34 @@
+package com.codedifferently.lesson17.bank;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+
+import java.util.Set;
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+class BusinessCheckingAccountTest {
+
+  @Test
+  void testBusinessAccountWithBusinessOwnerSucceeds() {
+    // Arrange
+    BusinessCustomer biz = new BusinessCustomer(UUID.randomUUID(), "Acme Corp");
+
+    // Act
+    BusinessCheckingAccount account = new BusinessCheckingAccount("BIZ123", Set.of(biz), 1000.0);
+
+    // Assert
+    assertThat(account.getBalance()).isEqualTo(1000.0);
+  }
+
+  @Test
+  void testBusinessAccountWithoutBusinessOwnerFails() {
+    // Arrange
+    Customer person = new Customer(UUID.randomUUID(), "John Doe");
+
+    // Act + Assert
+    assertThatExceptionOfType(IllegalArgumentException.class)
+        .isThrownBy(() -> new BusinessCheckingAccount("BIZ456", Set.of(person), 500.0))
+        .withMessage("BusinessCheckingAccount requires at least one BusinessCustomer as an owner");
+  }
+}