These tests are checking whether the input list was modified. The kata requires that the original data remains intact and you create a new list.

does your addition change the description on Python, C, Haskell, etc.? or does it appear only on the LC description?

this tests check that you haven't changed the input data. are you returning a new array?

yes, good call. i've added these.

i added a second test for each sample in the random section.

should i add checking for a non-mutated array for all tests?

changed

ah, my apologies for prematurely resolving. thanks for working with me and giving great feedback on my first submitted kata.

i added a clear feedback message for this test.

will not resolve until you validate

fixed :)

ah, i was wondering what the highlighting meant.

thank you, ready to review

good catch, fixed now

added this test case

@test.it("should return a new array")
def return_new():
    input = [10, 11, 10]
    cleaned_counts(input)
    test.assert_equals(input,[10,11,10])

i also checked that this test catches a mutated list

changed description language to:

Your task is to create a new non-decreasing array that is minimally different from the data array. For example, if the data = [1, 1, 2, 2, 1, 2, 2, 2, 2] then the returned array should be [1, 1, 2, 2, 2, 2, 2, 2, 2] because data[4] < data[3] is clearly an error.

i'm still not sure how to modify the tests to check that the user returned a new array. do you mean to include a test like the following?

@test.it("should return a new array")
def test_diff_array():
    input1 = [4, 5, 6, 7]
    test.assert_not_equals(cleaned_counts(input1), input1)

Thanks for your suggestion. I agree with you, but I'm not sure how to impose that the returned array is not mutated in the submission test. Would you please advise?