test_in_place_merge_sort does not tests for sorting in place

[DevWarr]

Code Reference

https://github.com/LambdaSchool/cs-module-project-recursive-sorting/blob/0fd49e2dbd425875300446e6bc444d6350cf3ae9/src/recursive_sorting/test_recursive.py#L21-L34

Bug

In-place sorting means that the initially passed in array will be modified, and does not need to be re-assigned.

If the merge_sort_in_place() function creates a new array and returns it without modifying the original, this test should fail. Currently, it does not.

Fix

Call the merge_sort_in_place() function before testing, and then assertEqual() the array itself to the expected value. This should test whether the array was truly modified in place.

Fixed in PR #11.