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This MR aims to improve the test coverage for the SourceFilter in anticipation of #6146
AbstractSouceFilterTestCase
as both SourceMapper and SourceFilter have the same requirements.The tests are far from exhaustive as we are testing the behavior of
glob
in order to be able to avoid calling it in the future notably we are not testing character classes and all the variants therein - and it's an open question if PHPUnit should support that going forward? A quick scan of github doesn't reveal anybody making uses of character classes.