ConditionalCommitTests: StaleExpectFailsWithNothingChanged, ExpectNullIsCreateOnce,
PerEntryCommitSurvivesUnrelatedWrite, ExpectUnchangedFailsOnUnrelatedInsert,
TwoWritersRacingExactlyOneWins, TryCommitReportsContended,
PlainFlushNeverInterleaves, StoredAtIsStrictlyIncreasingPerKey,
DirtyStoreRefusesConditionalCommit, CrossStoreConditionalBatchThrowsBeforeAnyStore,
DirectoryStoreHonorsConditions (the four condition tests on a directory store).
The race is in-process: two store instances on one file, two threads, the
final count exactly 2 + 2N. The lock is a FileShare.None handle, which excludes
a second handle in this process exactly as in another, so the cross-process
TwoProcessesRacingExactlyOneWins and its console project are not added. Each
writer's mismatch is scripted before the free race, so "each writer reports at
least one mismatch" does not depend on scheduling.
PlainFlushNeverInterleaves counts an open that loses to a replace in flight as
no read; every read that gets bytes must deserialize.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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