Update tests for Crypto contract to the latest testing framework API

[m-Peter]

Work towards: onflow/developer-grants#216

Description

Utilizes the latest API additions from the Cadence testing API, to provide a working example of unit testing.

Note: This was tested locally with a custom flow-cli build.

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (323b887) 79.43% compared to head (8037ea1) 79.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2856   +/-   ##
=======================================
  Coverage   79.43%   79.43%           
=======================================
  Files         332      332           
  Lines       79111    79111           
=======================================
  Hits        62842    62842           
  Misses      13958    13958           
  Partials     2311     2311           

Flag	Coverage Δ
unittests	79.43% <ø> (ø)

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[SupunS]

👏 👏

[m-Peter]

I have updated the CI workflow to also run the Cadence test file for the Crypto contract. cc @turbolent

[turbolent]

Awesome, great work! 👏

It's so nice how the test functions can now directly test the code and the testing code does not have to be in separate scripts 👌