improve anonymoussurvey and the module it' insurvey we could allow each user to enter more than one response we could write method to list only unique responses and to report how many times each response was given we could write another class to manage nonanonymous surveys implementing such changes would risk affecting the current behavior of the class anonymoussurvey for exampleit' possible that while trying to allow each user to enter multiple responseswe could accidentally change how single responses are handled to ensure we don' break existing behavior as we develop this modulewe can write tests for the class testing the anonymoussurvey class let' write test that verifies one aspect of the way anonymoussurvey behaves we'll write test to verify that single response to the survey question is stored properly we'll use the assertin(method to verify that the response is in the list of responses after it' been storedtest_ survey py import unittest from survey import anonymoussurvey class testanonmyoussurvey(unittest testcase)"""tests for the class anonymoussurvey"" def test_store_single_response(self)"""test that single response is stored properly ""question "what language did you first learn to speak?my_survey anonymoussurvey(questionmy_survey store_response('english'self assertin('english'my_survey responsesunittest main(we start by importing the unittest module and the class we want to testanonymoussurvey we call our test case testanonymoussurveywhich again inherits from unittest testcase the first test method will verify that when we store response to the survey questionthe response ends up in the survey' list of responses good descriptive name for this method is test_store_single_response( if this test failswe'll know from the method name shown in the output of the failing test that there was problem storing single response to the survey to test the behavior of classwe need to make an instance of the class at we create an instance called my_survey with the question "what language did you first learn to speak?we store single responseenglishusing the store_response(method then we verify that the response was stored correctly by asserting that english is in the list my_survey responses testing your code