Test enhancement

[peter279k]

Changed log

• Separating the test class PSR-4 autoloading from autoload attribute on composer.json and adding them to the autoload-dev attribute.
• Using the assertCount to assert expected count value is same as result count value.
• Using assertInstanceOf assertion to assert expected class instance is same as result class instance.

[codecov-io]

Codecov Report

Merging #12 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #12   +/-   ##
=========================================
  Coverage     62.83%   62.83%           
  Complexity      753      753           
=========================================
  Files            52       52           
  Lines          1321     1321           
=========================================
  Hits            830      830           
  Misses          491      491

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