Created tests for donations

[alhcomer]

Closes #683
Sorry for the delay creating a PR, I had some trouble with this task.

I am not 100% sure about testing that the the request was successful in the method 'test_serve_with_post_with_invalid_data' is correct, but I think the rest is OK.

Thanks :)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
6 Code Smells

No Coverage information
0.0% Duplication

[codeclimate]

Code Climate has analyzed commit 8bea56f and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 69.2% (0.7% change).

View more on Code Climate.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.86 🎉

Comparison is base (e143ac9) 68.33% compared to head (8bea56f) 69.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #746      +/-   ##
==========================================
+ Coverage   68.33%   69.20%   +0.86%     
==========================================
  Files         100      101       +1     
  Lines        2994     3023      +29     
==========================================
+ Hits         2046     2092      +46     
+ Misses        948      931      -17     

see 3 files with indirect coverage changes

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[brylie]

@all-contributors please add @alhcomer for test, code

[allcontributors]

@brylie

@alhcomer already contributed before to test, code