Feature/unit tests for knotx command

[marcinkp]

Description

Motivation and Context

Screenshots (if appropriate)

Upgrade notes (if appropriate)

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

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I hereby agree to the terms of the Knot.x Contributor License Agreement.

[codecov[bot]]

Codecov Report

Merging #18 into master will increase coverage by 6.96%. The diff coverage is 88.46%.

@@             Coverage Diff              @@
##             master      #18      +/-   ##
============================================
+ Coverage     73.39%   80.35%   +6.96%     
- Complexity      133      153      +20     
============================================
  Files            16       17       +1     
  Lines           575      616      +41     
  Branches         29       30       +1     
============================================
+ Hits            422      495      +73     
+ Misses          138      105      -33     
- Partials         15       16       +1

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/knotx/launcher/KnotxCommand.java	34.44% <60%> (+34.44%)	9 <3> (+9)	:arrow_up:
.../test/java/io/knotx/launcher/KnotxCommandTest.java	95.23% <95.23%> (ø)	10 <10> (?)
...in/java/io/knotx/launcher/KnotxCommandFactory.java	100% <0%> (+100%)	1% <0%> (+1%)	:arrow_up:

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