Adding code generation tests in the integration tests.

[helto4real]

Breaking change

Proposed change

Adding code generation tests in the integration tests so we can be alerted in a timely fashion if HA changes API that affects the code generator. This is due to recent events where changes in service descriptors broke code generation.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• The code compiles without warnings (code quality chek)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4b5b3c4) 80.70% compared to head (68c4dac) 80.70%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #859   +/-   ##
=======================================
  Coverage   80.70%   80.70%           
=======================================
  Files         162      162           
  Lines        4142     4142           
  Branches      411      411           
=======================================
  Hits         3343     3343           
  Misses        636      636           
  Partials      163      163           

Flag	Coverage Δ
unittests	80.70% <ø> (ø)

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