Add test

[keigohtr]

What is this PR for?

To improve test coverage.

This PR includes

• Add test

What type of PR is it?

Feature

What is the issue?

#16

How should this be tested?

$ python -m unittest

[codecov-io]

Codecov Report

Merging #20 into master will increase coverage by 7.43%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #20      +/-   ##
=========================================
+ Coverage   87.37%   94.8%   +7.43%     
=========================================
  Files           8       6       -2     
  Lines         293     289       -4     
=========================================
+ Hits          256     274      +18     
+ Misses         37      15      -22

Impacted Files	Coverage Δ
rekcurd_client/logger/logger_fluent.py	100% <100%> (+53.84%)	⬆️
rekcurd_client/logger/logger_jsonlogger.py	100% <100%> (+25%)	⬆️
rekcurd_client/core/__init__.py	100% <100%> (ø)
rekcurd_client/core/rekcurd_worker_client.py	95.16% <100%> (ø)
rekcurd_client/_project.py
rekcurd_client/_version.py

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