/**
   * Test method for {@link
   * edu.ncsu.csc216.flix_2.customer.MovieCustomerAccountSystem#addNewCustomer(java.lang.String,
   * java.lang.String, int)} .
   */
  @Test
  public void testAddNewCustomer() {
    // test exception thrown if admin is not logged in
    // and we try to create a new customer
    assertEquals("", system.listAcounts());
    try {
      system.addNewCustomer("user", "password", 10);
      fail("No Exception/Didn't catch it)");
    } catch (IllegalStateException e) {
      assertEquals("", system.listAcounts());
    }

    assertEquals("", system.listAcounts());
    // creating a new user
    system.login(admin, admin);
    // test if exceptions are propogated when
    // username or password is null
    try {
      system.addNewCustomer(null, "user1", 10);
      fail("No Exception/Didn't catch it)");
    } catch (Exception e) {
      assertEquals("", system.listAcounts());
    }
    system.logout();

    // test creating and adding a new customer
    assertEquals("", system.listAcounts());
    system.login(admin, admin);
    system.addNewCustomer("user", "user", 10);
    system.logout();
    assertEquals("user\n", system.listAcounts());
  }
 /**
  * Test method for {@link
  * edu.ncsu.csc216.flix_2.customer.MovieCustomerAccountSystem#isCustomerLoggedIn()} .
  */
 @Test
 public void testIsCustomerLoggedIn() {
   // Create a new customer to work with
   system.login(admin, admin);
   system.addNewCustomer("user", "user", 10);
   system.logout();
   // test if the customer logged in has logged out
   system.login("user", "user");
   assertTrue(system.isCustomerLoggedIn());
   system.logout();
   assertFalse(system.isCustomerLoggedIn());
 }
  /**
   * Test method for {@link
   * edu.ncsu.csc216.flix_2.customer.MovieCustomerAccountSystem#login(java.lang.String,
   * java.lang.String)} .
   */
  @Test
  public void testLogin() {

    // test exception thrown if customer does not exist
    try {
      system.login("user", "password");
      fail("No Exception/Didn't catch it)");
    } catch (IllegalArgumentException e) {
      assertFalse(system.isCustomerLoggedIn());
    }

    // test exception thrown if the admin has invalid username or password
    try {
      system.login(admin, "password");
      fail("No Exception/Didn't catch it)");
    } catch (IllegalArgumentException e) {
      assertFalse(system.isAdminLoggedIn());
    }

    // test exception thrown if a user has not logged out
    // and another user tries to log in
    system.login(admin, admin);
    assertTrue(system.isAdminLoggedIn());
    assertFalse(system.isCustomerLoggedIn());
    try {
      system.login("username", "password");
      fail("No Exception/Didn't catch it)");
    } catch (IllegalStateException e) {
      assertTrue(system.isAdminLoggedIn());
      assertFalse(system.isCustomerLoggedIn());
    }

    system.logout();

    // test if admin is logged in
    system.login(admin, admin);
    assertTrue(system.isAdminLoggedIn());
    system.logout();

    // test if a customer is logged in
    system.login(admin, admin);
    system.addNewCustomer("user", "user", 10);
    system.logout();
    // System.out.println(system.listAcounts());
    system.login("user", "user");
    assertTrue(system.isCustomerLoggedIn());
    system.logout();
  }
 /**
  * Test method for {@link
  * edu.ncsu.csc216.flix_2.customer.MovieCustomerAccountSystem#isAdminLoggedIn()} .
  */
 @Test
 public void testIsAdminLoggedIn() {
   // test if the admin has logged in and logged out
   system.login(admin, admin);
   assertTrue(system.isAdminLoggedIn());
   system.logout();
   assertFalse(system.isAdminLoggedIn());
 }
  /**
   * Test method for {@link
   * edu.ncsu.csc216.flix_2.customer.MovieCustomerAccountSystem#listAcounts()} .
   */
  @Test
  public void testListAcounts() {
    // adding a new customer and listing the accounts
    assertEquals("", system.listAcounts());
    system.login(admin, admin);
    system.addNewCustomer("user", "password", 10);
    system.logout();
    assertEquals("user\n", system.listAcounts());

    // adding two more customers to check if
    // it lists the usernames is lexicographic order
    assertEquals("user\n", system.listAcounts());
    system.login(admin, admin);
    system.addNewCustomer("realUser", "password", 10);
    system.addNewCustomer("theRealUser", "password", 10);
    system.logout();
    assertEquals("realUser\ntheRealUser\nuser\n", system.listAcounts());
  }