Some minor improvements

[pkulev]

Closes issue(s): [ ]

Description of the changes:

• What's new: Use importorskip pytest function, because it fits Some minor changes and typo fix

• Fixes:

• Refactoring:

Reviewers: [ @taptap ]

Task list:

• [x] submit pull request
• [ ] review
• [ ] testing
• [ ] fixes after review, squashing, rebasing to master

[codecov-io]

Current coverage is 52.54% (diff: 100%)

Merging #41 into master will decrease coverage by 0.05%

@@             master        #41   diff @@
==========================================
  Files            36         36          
  Lines          1614       1608     -6   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
- Hits            849        845     -4   
+ Misses          765        763     -2   
  Partials          0          0          

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