Refactor tests to use a suite of common test problems

[odow]

With a view to #113

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.79%. Comparing base (e20e684) to head (c3d040e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #114   +/-   ##
=======================================
  Coverage   98.79%   98.79%           
=======================================
  Files           9        9           
  Lines         994      996    +2     
=======================================
+ Hits          982      984    +2     
  Misses         12       12           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.