Refactor validate item name helper + add tests

[niekcandaele]

fixes #65

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@6f49ad8). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #143   +/-   ##
=========================================
  Coverage          ?   20.93%           
=========================================
  Files             ?      394           
  Lines             ?     6273           
  Branches          ?        0           
=========================================
  Hits              ?     1313           
  Misses            ?     4960           
  Partials          ?        0           

Impacted Files	Coverage Δ
api/helpers/sdtd/validate-item-name.js	100.00% <100.00%> (ø)
...controllers/SdtdServer/commands/enable-commands.js	25.00% <0.00%> (ø)
api/controllers/SdtdServer/view-gbl.js	12.50% <0.00%> (ø)
api/controllers/BannedItemList/set-command.js	33.33% <0.00%> (ø)
...i/controllers/SdtdServer/economy/enable-economy.js	14.28% <0.00%> (ø)
...ollers/SdtdServer/commands/get-player-teleports.js	33.33% <0.00%> (ø)
api/helpers/load-sdtdServer-info.js	9.52% <0.00%> (ø)
api/controllers/SdtdServer/restart-server.js	8.33% <0.00%> (ø)
api/helpers/meta/load-system-stats-and-info.js	7.69% <0.00%> (ø)
...lers/SdtdServer/countryBan/get-banned-countries.js	33.33% <0.00%> (ø)
... and 385 more

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[codeclimate]

Code Climate has analyzed commit 7fc2f05 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 20.9% (0.1% change).

View more on Code Climate.