Test scaffold generated files

[jenovateurs]

Hello team!

I added some tests about Scaffold.
The tests check the file generated by Scaffold with Volt and Phtml.

• Type: code quality
• Link to issue: Add tests to check if Scaffold files works #1437

In raising this pull request, I confirm the following (please check boxes):

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR

Thanks for the review

[codecov]

Codecov Report

Merging #1454 into 4.0.x will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##           4.0.x   #1454      +/-   ##
========================================
+ Coverage   3.42%   3.44%   +0.01%     
========================================
  Files        111     111              
  Lines       5114    5114              
========================================
+ Hits         175     176       +1     
+ Misses      4939    4938       -1     

[jenovateurs]

About Codacy, I don't know how to handle it.
It's about Codeception use.