Tests: Add test resources for AspireUpdate\Debug

[costdev]

Pull Request

What changed?

• A new unit test case has been introduced: Debug_UnitTestCase.
• A fake filesystem class to aid testing has been introduced: AP_FakeFilesystem.
  • This extends WP_Filesystem_Direct and currently overrides the ::exists(), ::is_readable(), and ::is_writable() methods.
• Coding Standards: Some sniffs were previously excluded just for test classes. These have been expanded to all files in tests/phpunit/.
• Coding Standards: Sniffs against native PHP functions for filesystem interaction have been excluded for files in tests/phpunit/.

Why did it change?

• To make PHPUnit testing AspireUpdate\Debug consistent and easier.
• To prevent coding standards errors and warnings for common and legitimate use in tests.

Did you fix any specific issues?

See #216

CERTIFICATION

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[afragen]

Should we consider adding our basic functions for Reflection?

[costdev]

Sorry @afragen I missed this comment before merging. At this stage I think we're only using the Reflection API a few times. If we find that we end up using it more, then yeah I think we should definitely look at adding the basic helper functions we wrote for the Reflection API to the codebase.

[afragen]

I wrote the comment post-merge so don't worry. Just asking.