run-tests: allow whitelisting tests that should always run It's desirable to run some tests all the time, for example test-check-pyflakes.t and test-check-code-hg.py. This allows passing --whitelist as a path to a file (flag can be specified more than once) which contains a list of files to whitelist. Whitelisted tests are run even if they're blacklisted or wouldn't match a --keyword test run. For example, to do a quick test of usehttp2, one can now do $ cat > test-whitelist <<EOF > test-check-pyflakes.t > test-check-code-hg.py > EOF $ (cd tests && ./run-tests.py --extra-config-opt 'ui.usehttp2=true' > -k http -j 8 --whitelist test-whitelist) and have all http-specific tests run as well as the two code linters.