feature(test): add test code

[pylover7]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 51.56250% with 31 lines in your changes are missing coverage. Please review.

Project coverage is 46.84%. Comparing base (f259e6a) to head (eb77a4c).

Files	Patch %	Lines
zgrobot/pay.py	42.30%	15 Missing :warning:
zgrobot/logger.py	72.22%	5 Missing :warning:
zgrobot/client.py	20.00%	4 Missing :warning:
zgrobot/robot.py	55.55%	4 Missing :warning:
zgrobot/crypto/__init__.py	0.00%	2 Missing :warning:
zgrobot/utils.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop-2.0.7 #265 +/- ## ================================================== - Coverage 88.26% 46.84% -41.42% ================================================== Files 32 31 -1 Lines 1525 1441 -84 ================================================== - Hits 1346 675 -671 - Misses 179 766 +587 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.