Use the correct lock constant when stream wrapper locks the file #16
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$operation contains
0
value which results toValueError: flock(): Argument #2 ($operation) must be one of LOCK_SH, LOCK_EX, or LOCK_UN
So we explicitly use
LOCK_SH
Fixes failed builds for infection/infection#1549
Background:
PHPUnit sets an exclusive lock when flushed results into
.phpunit.result.cache
file, herehttps://github.com/sebastianbergmann/phpunit/blob/83ff29a80f63b8354be60e057c1dad37cc04570b/src/Runner/DefaultTestResultCache.php#L144
and our stream wrapper was not ready for it - it failed with the error above.