Lib/test/test_array.py
  -- Moved index test (for this issue) to test_index (existing test method).
  -- Added remove test (for this issue) to test_remove (existing test method)

Lib/test/test_deque.py
  -- Moved remove test (for this issue) to test_index (existing test method).

Lib/test/test_list.py
  -- Added test_remove instead of test_issue13349, and test_index as a new test method; both with positive tests and a negative test to for this issue.

Lib/test/test_tuple.py
  -- Added test_remove instead of test_issue13349 as a new test method with a positive test and a negative test case for this issue to cover both items longer than 100chars and shorter items.

Lib/test/test_xml_etree.py
  -- Added test_remove as a new test method to TreeBasicOperationTest testcase class instead of test_issue13349, with a positive test case and the negative test to cover this issue.