CiviUnitTestCase - Extract Api3TestTrait and Api3DocTrait

[totten]

Overview

This is a simple refactoring which moves several utility functions out of the base-class CiviUnitTestCase and into smaller traits, Api3TestTrait and Api3DocTrait.

Before

• CiviUnitTestCase is a 4000-line behemoth.

After

• CiviUnitTestCase is a 3600-line behemoth, which builds on Api3TestTrait and Api3DocTrait.
• Other PHPUnit tests can incorporate Api3TestTrait if they want to easily perform assertions about API calls.
• Other PHPUnit tests can incorporate Api3DocTrait if they want to easily perform assertions about API calls and also make example files from the API call log. (Personally, I don't expect to use Api3DocTrait, but it's better to move that bit to separate file.)

Comments

• I spot-checked a few tests locally to ensure they still pass.
• If the PR test passes, that's a pretty good sign that it works... considering that this refactoring is only test code.
• Additionally, it would be good to write a quicky extension with a test which uses Api3TestTrait.

[eileenmcnaughton]

@totten style issue

[totten]

Thanks. Fixed/squashed/pushed.

[eileenmcnaughton]

Added merge on pass - Jenkins is the only review that matters for this one

[seamuslee001]

Tests have passed and only affects unit tests merging