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... for quite a few report types.
The Reports which PHPCS can generate, were until now not covered by tests and therefore had no safeguards/QA whatsoever.
This commit sets up an initial end-to-end test suite with tests for common report types.
It doesn't have an opinion on whether or not the reports as currently generated are formatted correctly.
For now, it just codifies the current functionality.
For lack of documentation about this format in the PHPUnit docs, the test docs for PHP Core are the closest available to explain the available sections and how to apply these: https://qa.php.net/phpt_details.php
With this initial setup done, it should be fairly straight-forward to expand this end-to-end test suite to cover more report types and to add tests for other command-line options as well.
Mind: these type of tests are generally slow, so unit tests/integration tests should be preferred.