Supertest setup

[mikolaj-pirog]

Setup supertest to test http endpoints.

Split index.ts to server.ts with listen and app.ts with endpoints. This is done, so testing of endpoints will be possible without calling listen (that way supertest can assign its own port, also no need to worry about closing down the server).

It turn out that imports of ts files need to end with .js, otherwise they will not work after tsc. See server.ts

[codecov]

Codecov Report

Patch coverage: 62.50% and project coverage change: +26.31 🎉

Comparison is base (fa7d715) 0.00% compared to head (5b1d737) 26.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #24       +/-   ##
==========================================
+ Coverage   0.00%   26.31%   +26.31%     
==========================================
  Files          1        3        +2     
  Lines          8       19       +11     
==========================================
+ Hits           0        5        +5     
- Misses         8       14        +6     

Impacted Files	Coverage Δ
src/server.ts	0.00% <0.00%> (ø)
src/app.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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