Purpose: To practice using blackbox testing without seeing a functions codeBlack box tests are typically best written BEFORE you even start writing the function they are intended totest. For this question, you will write a series of black box tests for a function that you never write or seeyourself.The improvedAverage$()$ functionThe function you are testing is called improvedAverage$().$ The function accepts a single parameter, whichis a list of integers. The function should return the value True if the average of the last $10$ values in thelist is greater than the average of all of the other values $($i$.$e$.$ everything else EXCEPT the last $10$ values$),$and False otherwise.If the list is empty or contains fewer than $20$ values, the value None should be returned instead.Remember: you are not writing this function. You just need to understand what it is supposed to do sothat you can write effective test cases for it$.$Write a test driverWrite a test driver that contains several tests for the improvedAverage$()$ function. A starter file is providedthat contains an example of a single test case. Add additional tests to this file, following the example ofthe textbook.Choose your test cases thoughtfully to cover a range of possible situations. Do NOT bother with test casesthat use incorrect data types $($i$.$e$.$ passing in something other than a list, or a list of booleans instead of alist of integers$).$ Instead, focus on tests to expose any possible errors in the functions logic. Exactly howmany test cases to use is up to you; include as many as you think you need to discover any errors in thefunction