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If `$FILTER` (`-f`) and `$EXCLUDE` (`-e`) are simple selections that can be expressed as shell patterns, use a case statement instead of calling grep to determine whether a test case should be executed. Using a case statement significantly reduces the time it takes to determine that a test case is excluded (but the improvement is small compared to running the test). This noticeably speeds up running a single test or a small number of tests. Before: ``` tests/ssl-opt.sh -f Default 1.75s user 0.54s system 79% cpu 2.885 total ``` After: ``` tests/ssl-opt.sh -f Default 0.37s user 0.14s system 29% cpu 1.715 total ``` There is no perceptible difference when running a large number of tests. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>