Improve PHPUnit assertions

[peter279k]

Changed log

• Using the assertFileExists to assert expected file path is existed.
• Using the assertFileNotExists to assert expected file path is not existed.
• Using the assertIsResource to assert expected type is resource.
• Using the assertCount to assert expected counter is same as result.

[akondas]

Thanks for contribution, assertFileNotExists is deprecated, assertFileDoesNotExist should be used instead: sebastianbergmann/phpunit#4077

[peter279k]

Thanks for contribution, assertFileNotExists is deprecated, assertFileDoesNotExist should be used instead: sebastianbergmann/phpunit#4077

You're right. I will fix that.

[codecov]

Codecov Report

Merging #425 (2d14e1b) into master (3cc224e) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #425   +/-   ##
=========================================
  Coverage     99.38%   99.38%           
  Complexity     1864     1864           
=========================================
  Files           297      297           
  Lines          5873     5873           
=========================================
  Hits           5837     5837           
  Misses           36       36           

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[akondas]

Thanks 🍻