Add tests for the head component

[caendesilva]

This component is pretty important, so we might as well have some tests for it!

[codecov]

Codecov Report

Merging #923 (e98b44c) into master (427e8ac) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##              master      #923     +/-   ##
=============================================
  Coverage     100.00%   100.00%             
- Complexity      1237      2474   +1237     
=============================================
  Files            145       290    +145     
  Lines           3269      6538   +3269     
=============================================
+ Hits            3269      6538   +3269     

Impacted Files	Coverage Δ
...ork/src/Markdown/Processing/ShortcodeProcessor.php	100.00% <0.00%> (ø)
...ramework/src/Console/Commands/BuildSiteCommand.php	100.00% <0.00%> (ø)
...es/framework/src/Framework/HydeServiceProvider.php	100.00% <0.00%> (ø)
...Markdown/Processing/CodeblockFilepathProcessor.php	100.00% <0.00%> (ø)
.../framework/src/Framework/Services/BuildService.php	100.00% <0.00%> (ø)
...ckages/framework/src/Foundation/PageCollection.php	100.00% <0.00%> (ø)
...amework/src/Framework/Services/MarkdownService.php	100.00% <0.00%> (ø)
...ework/src/Console/Commands/PublishViewsCommand.php	100.00% <0.00%> (ø)
...ork/Features/Metadata/Elements/MetadataElement.php	100.00% <0.00%> (ø)
.../src/Framework/Factories/NavigationDataFactory.php	100.00% <0.00%> (ø)
... and 135 more

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[what-the-diff]

• Added a new test file
• Created the HeadComponentViewTest class and extended it from TestCase
• Defined setUp() method to mock page object using Hyde::mockPage() function
• Defined renderTestView() method which renders head component view by calling Blade facade's render method with escaped includes of vendor path resources/views/layouts/head blade template as argument
• Wrote 5 tests for testing different scenarios like rendering meta tags, title element uses htmlTitle property of Page model, link to favicon is not added when file does not exist etc...