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 4.9%. Comparing base (784ff20) to head (8ed740f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #74     +/-   ##
=======================================
+ Coverage     0.0%   4.9%   +4.9%     
=======================================
  Files          24     24             
  Lines        2259   2315     +56     
=======================================
+ Hits            0    113    +113     
+ Misses       2259   2202     -57     

Flag	Coverage Δ
rust	4.9% <100.0%> (+4.9%)	⬆️

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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.

[dr-orlovsky]

I have merged fmt changes and now you can just skip formatting commit. After that I will be able to merge this PR. Thank you!

[dr-orlovsky]

tACK 8ed740f

Congrats with the first contribution!