Increasing code coverage

[laurejt]

Identified issues:

• Missing test case for test_count_pages when its optional argument ptree_client is not provided (i.e., None)
• For page_index_data, missing test for when page_range is larger than max_page

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.13%. Comparing base (dc30aa9) to head (a6105c3).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #697   +/-   ##
========================================
  Coverage    95.12%   95.13%           
========================================
  Files          139      139           
  Lines         7573     7582    +9     
  Branches         7        8    +1     
========================================
+ Hits          7204     7213    +9     
  Misses         369      369