test round trip

[patrix252]

This PR adds some simple tests to check that string round-trip conversion of all objects implementing from_str works fine.

In addition, I've also formatted the code with cargo +nightly fmt --all.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 5.1%. Comparing base (f3ce1c3) to head (36d682c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #74     +/-   ##
=======================================
+ Coverage     0.0%   5.1%   +5.1%     
=======================================
  Files          24     24             
  Lines        2159   2215     +56     
=======================================
+ Hits            0    113    +113     
+ Misses       2159   2102     -57     

Flag	Coverage Δ
rust	5.1% <100.0%> (+5.1%)	⬆️

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[dr-orlovsky]

Thank you very much and congrats with the first time contribution!

Re cargo fmt, this is a new nightly version which once again changed rules with no notice. I will fix it by using edition_style new option in cargofmt.toml and will ask you to rebase after.