test: adds Closed Account Tests to CheckingAccountTest.java

Author: tmcrockett252

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

@@ -47,6 +47,38 @@ void deposit_withNegativeAmount() {
         .isThrownBy(() -> classUnderTest.deposit(-50.0));
   }
 
+  @Test
+  void deposit_toClosedAccount() {
+    classUnderTest.withdraw(100.0);
+    classUnderTest.closeAccount();
+
+    assertThatExceptionOfType(IllegalStateException.class)
+        .isThrownBy(() -> classUnderTest.deposit(50.0))
+        .withMessage("Cannot deposit to a closed account");
+  }
+
+  @Test
+  void withdraw_fromClosedAccount() {
+    classUnderTest.withdraw(100.0);
+    classUnderTest.closeAccount();
+
+    assertThatExceptionOfType(IllegalStateException.class)
+        .isThrownBy(() -> classUnderTest.withdraw(50.0))
+        .withMessage("Cannot withdraw from a closed account");
+  }
+
+  @Test
+  void closeAccount_successfullyClosesAccount() {
+    // First withdraw all funds
+    classUnderTest.withdraw(100.0);
+    
+    // Act
+    classUnderTest.closeAccount();
+
+    // Assert
+    assertTrue(classUnderTest.isClosed());
+  }
+
   @Test
   void withdraw() {
     classUnderTest.withdraw(50.0);