[#1200] Added behat code coverage tool.

[richardgaunt]

closes #1200

Checklist before requesting a review

• I have formatted the subject to include ticket number as [#123] Verb in past tense with dot at the end.
• I have added a link to the issue tracker
• I have provided information in Changed section about WHY something was done if this was not a normal implementation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have run new and existing relevant tests locally with my changes, and they passed
• I have provided screenshots, where applicable

Changed

Screenshots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.41%. Comparing base (543f8b5) to head (eda74b8).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1229      +/-   ##
===========================================
- Coverage    65.45%   65.41%   -0.04%     
===========================================
  Files           59       59              
  Lines         3303     3305       +2     
===========================================
  Hits          2162     2162              
- Misses        1141     1143       +2     

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[AlexSkrypnyk]

@richardgaunt
Thank you for working on this.
This tool only covers the code used to run the Behat tests, not the system under tests :(
Looks like it is not possible to implement the coverage for Drupal. Closing.