Convert the test suite to PHPUnitPolyFills and update to PHP 8 #17
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This PR ports the test suite to PHPUniPolyFills which allow the test suite to run on many versions of PHPUnit (this library is recommended on PHPUnit home page so I think it's a robust solution). Therefore, we can run on all current versions of PHP.
There is almost no change to the code itself except:
Yoast\PHPUnitPolyfills\TestCases\TestCaseso they must implementset_up/tear_down(instead ofsetUp/tearDown). See the doc here.AllTests.phpbecause I could not port it. AFAIU, it doesn't change the tests.This PR is based on the branch used for PR #16 (so this one must be merged first and I must rebase). It only adds d6dd558 and 74c8855.
Also it replaces #15.