Add compat entries for test dependencies

[adrhill]

Adds a test/Project.toml with compat entries for all test dependencies.

An update of some test references was required, probably due to changes in dependencies.

[codecov[bot]]

Codecov Report

Merging #90 (495d4e2) into master (8bfb487) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #90   +/-   ##
=======================================
  Coverage   97.69%   97.69%           
=======================================
  Files          12       12           
  Lines         260      260           
=======================================
  Hits          254      254           
  Misses          6        6           

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