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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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Previous commit accidentally broke mixing line filters with string -n filter.
Fix by checking if it is a string and returning it.
We also need to ensure the -n filter carry forward into any other composite filters.
Fix by letting the named filter be extractable, so we'll keep this for the next runnable's
run.
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`derive_regexp` was written with the assumption that we were run from a
blank slate — that if the filter didn't match we might as well return it
because it was nil.
This isn't the case because minitest calls `run` on every runnable. Which
is any subclass of Minitest::Runnable, such as ActiveSupport::TestCase,
ActionDispatch::IntegrationTest as well as any inheriting from those.
Thus after the first `run` we'd have put in a composite filter in
`options[:filter]` making the next `run` create a linked list when it
failed to match the regexp and put the composite filter as the head.
Every runnable would accumulate more and more of the same filters,
which effectively acted like an expanding whitelist and we ran tests
from other runnables.
Clog the accumulation by returning nil if there's no filter to derive
a regexp from.
Note: we pass a seed in the tests because Minitest shuffles the runnables
to ensure the whitelist is expanded enough that the failure is triggered.
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It might be tough for readers to know why we implement `===`, and where
the Regexp in `derive_regexp` came from.
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The line filter parsing added to ActiveSupport::TestCase is only half the story
to enable line filtering. The other half, of adding the patterns to the options,
is done in the Minitest plugin that Railties has.
Thus it makes more sense to have the filter in Railties with the other half and
all the line filtering tests.
Move the filter and extend Active Support in an initializer, so that when users
or `rails/all.rb` require `rails/test_unit/railtie` we can still filter by line.
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