Tests

Support switch on ::class #21496

Job	Run time
Integration tests (ubuntu-latest)	43s
Tests (8.2, ubuntu-latest)	37s
Integration tests (windows-latest)	1m 40s
Tests (8.3, windows-latest)	1m 44s
Tests (8.2, windows-latest)	1m 23s
Tests (8.3, ubuntu-latest)	40s
Determine levels tests matrix	34s
Tests with old PHPUnit (8.0, windows-latest)	3m 21s
Tests with old PHPUnit (7.4, windows-latest)	12m 52s
Tests with old PHPUnit (8.1, windows-latest)	3m 21s
Tests (8.4, windows-latest)	1m 41s
Tests with old PHPUnit (8.1, ubuntu-latest)	1m 58s
Tests (8.4, ubuntu-latest)	38s
Tests with old PHPUnit (7.4, ubuntu-latest)	6m 11s
Tests with old PHPUnit (8.0, ubuntu-latest)	1m 48s
Levels tests	0s
	39m 11s

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