feat: adds testBusinessCheckingAccount

Author: AmiyahJo

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

@@ -0,0 +1,32 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import org.junit.jupiter.api.Test;
+ 
+class BusinessCheckingAccountTest {
+
+    @Test
+    void testConstructorWithBusinessOwner() {
+        Set<com.codedifferently.lesson17.bank.Customer> owners = new HashSet<>();
+        owners.add(new Customer(UUID.randomUUID(), "John Doe", true)); 
+        BusinessCheckingAccount account = new BusinessCheckingAccount("12345", owners, "Tech Corp", 1000.0);
+        assertEquals("Tech Corp", account.getBusinessName());
+    }
+
+    @Test
+    void testConstructorWithoutBusinessOwner() {
+        Set<com.codedifferently.lesson17.bank.Customer> owners = new HashSet<>();
+        owners.add(new Customer(UUID.randomUUID(), "Jane Doe", false)); 
+
+        Exception exception = assertThrows(IllegalArgumentException.class, () -> {
+            new BusinessCheckingAccount("12345", owners, "Tech Corp", 1000.0);
+        });
+
+        assertEquals("At least one owner must be a business.", exception.getMessage());
+    }
+}