Parallel testing support

[lukeraymonddowning]

Q	A
Bug fix?	no
New feature?	yes

Hi all,

Here it is! A very early draft of parallel testing in Pest. This uses brianium/paratest as the base runner.

I'll be adding more detail here as I continue work on this, but wanted to get it out in the open for suggestions and changes.

Kind Regards,
Luke

[lukeraymonddowning]

So, there is one breaking test in the repo. That test isn't related to parallel and the bug can be reproduced without it:

bin/pest tests/PHPUnit/CustomTestCaseInSubFolders/SubFolder/SubFolder/UsesPerSubDirectory.php

will reproduce outside of this branch.

[lukeraymonddowning]

Todos (in no particular order):

• PR some changes to Paratest itself which would negate having to override entire classes for 1 or 2 lines
• Build a custom printer that supports the additional Paratest functionality but outputs Pest style
• Allow the --coverage flag, which would run paratest's coverage functionality then output Pest style
• Test edge cases and other operating systems (Windows, Linux)

[owenvoke]

So, there is one breaking test in the repo. That test isn't related to parallel and the bug can be reproduced without it:

bin/pest tests/PHPUnit/CustomTestCaseInSubFolders/SubFolder/SubFolder/UsesPerSubDirectory.php

will reproduce outside of this branch.

I wonder if that's because the required uses() calls in Pest.php aren't being called or something for a single test run? 🤔

[lukeraymonddowning]

@owenvoke its actually the Pest file in tests/PHPUnit/Pest.php that isn't being called.

[owenvoke]

@lukeraymonddowning, sorry yes. I corrected my comment earlier. 👍🏻 Forgot where the nested file was.

[nuernbergerA]

• Allow the --coverage flag, which would run paratest's coverage functionality then output Pest style