Code coverage testing

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@853a63c). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head ff4d51c differs from pull request most recent head e2d61a7. Consider uploading reports for the commit e2d61a7 to get more accurate results

@@            Coverage Diff            @@
##             master      #65   +/-   ##
=========================================
  Coverage          ?   41.03%           
=========================================
  Files             ?       29           
  Lines             ?     1735           
  Branches          ?        0           
=========================================
  Hits              ?      712           
  Misses            ?     1023           
  Partials          ?        0           

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[LHMarshall]

These tests have actually picked up an issue... for the segmented design there is a subscript error when there are no transects generated in one of the strata.

The code coverage appears to be working so will merge this pull request and then create another branch to debug this issue.