Guard %ENV access with exists() checks and some minor edge case bugs I found while doing so #908
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haarg
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Mar 13, 2023
demerphq
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A test might lock %ENV, so we should always check for key existence before reading a key, or the lookup might trigger an exception. This function wraps the check up and provides a default facility to make logic that needs to consult %ENV more robust.
_env_get() ensures that if %ENV is locked we wont throw an exception accessing a missing key. Tests might lock %ENV.
There were two problems. The first is accessing the %ENV hash when it might locked. Using Test2::Util::_env_get() solves that problem. The second issue is that the patterns might match "+" with no extra string, leaving the formatter as the empty string. The third problem is the defaulting for the formatter could end up not being triggered and the formatter being left as the empty string. This fixes all three issues. I noticed the second two when I fixing the first and did it wrong accidentally.
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Closing as per #907 (comment) |
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In Perl/perl5#20928 I discovered that if %ENV is locked while testing and a test fails then Test::More blows up horribly. You can argue this issue several ways, including that it is a Hash::Util testing bug. But I think Test::More can harden itself pretty reasonably against this issue by simply checking for key existence before reading a key. I did not attempt to deal with the places where there are writes to ENV, obviously that is going to end badly if %ENV is locked. But reading from a locked %ENV during testing is easy to guard against and obviously at least possible to happen since code doing so has been in perl core for a long time. :-)
Related tickets:
#907
Perl/perl5#20929
Along the way I noticed a subtle error in the logic for parsing the T2_FORMATTER env var. If the string is set to "+" it would end up setting the formatter to the empty string. I also realized it was possible for the logic to not set it at all, and step past the defaulting logic in Test2::API::Instance. So I fixed it. Since part of this logic reads from the %ENV I dealt with both issues in the same commit. Hope that is ok.