def test_login_invalid_user(self):
     login_page = LoginPage(self.driver)
     login_page.enter_username("NotAValidUser")
     login_page.enter_password(GC.PASSWORD)
     login_page.click_sign_in_button()
     self.assertTrue(login_page.is_sign_in_error_message_displayed(), GM.MISSING_ERROR_MSG)
 def test_login_valid_user_invalid_password(self):
     login_page = LoginPage(self.driver)
     login_page.enter_username(GC.USERNAME)
     login_page.enter_password("N0T4V4L1DP4SSW0RD")
     login_page.click_sign_in_button()
     self.assertTrue(login_page.is_sign_in_error_message_displayed(), GM.MISSING_ERROR_MSG)
 def test_login_empty_fields(self):
     login_page = LoginPage(self.driver)
     login_page.enter_username("")
     login_page.enter_password("")
     login_page.click_sign_in_button()
     self.assertTrue(login_page.is_sign_in_error_message_displayed(), GM.MISSING_ERROR_MSG)