Use a stricter mypy configuration and annotate test functions

[mmaslowskicc]

No description provided.

[codecov-commenter]

Codecov Report

Merging #464 (eeb1c55) into master (8045efd) will decrease coverage by 0.22%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #464      +/-   ##
==========================================
- Coverage   84.16%   83.94%   -0.23%     
==========================================
  Files          22       22              
  Lines         998     1003       +5     
==========================================
+ Hits          840      842       +2     
- Misses        158      161       +3     

Flag	Coverage Δ
linux	82.55% <83.33%> (-0.02%)	⬇️
macos	81.65% <83.33%> (-0.21%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/mirakuru/http.py	97.43% <ø> (ø)
tests/server_for_tests.py	0.00% <0.00%> (ø)
tests/signals.py	0.00% <0.00%> (ø)
src/mirakuru/base.py	97.61% <100.00%> (ø)
tests/executors/test_executor.py	100.00% <100.00%> (ø)
tests/executors/test_executor_kill.py	100.00% <100.00%> (ø)
tests/executors/test_http_executor.py	100.00% <100.00%> (ø)
tests/executors/test_output_executor.py	100.00% <100.00%> (ø)
tests/executors/test_pid_executor.py	100.00% <100.00%> (ø)
tests/executors/test_tcp_executor.py	100.00% <100.00%> (ø)
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8045efd...eeb1c55. Read the comment docs.

[fizyk]

Do you want to also add a py.typed file?

[mmaslowskicc]

Do you want to also add a py.typed file?

We already install one.