* add a test case for "not provided a required parameter"
* add a test cases for "not provided locked file"
* cleanup for case provider
* add a test case for "package existence"
* add a test case for "warning when dependencies are not installed"
* fix the test case for "warning when dependencies are not installed"
* add a test case for "package was not found in the project"
* add a test cases for `why-not` command
- also they were fixed docblocks
* add a test cases for `why` command
* versions were added to dependency objects
* it was avoided HEREDOC due it seems to be failing in PHP 7.2
* it was avoided mismatches due different platforms EOL
* it was used full output instead of an array of messages (to avoid EOL isues)
* it increased code coverage to 97%
* All test case docblocks were corrected according to CR feedback
* ensure that `why-not` should say that an installed package requires an incompatible version of the inspected package
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