Multi-Node Safety & Concurrency Tests

[niteshpurohit]

Feature Request

Description

Add concurrency and multi-node tests proving at-most-once dispatch semantics.

Use Case

Confirms correct behavior under contention and race conditions.

Proposed Solution

• Use FakeRedis and Thread fan-out to simulate two+ coordinators.
• Verify only one dispatch per (key, fire_time) even under contention.
• Add timing fuzzers and randomized schedules to catch edge cases.
• Run as part of CI matrix (Ruby 3.2/3.3; Rails 7.2/8.0/edge).

Alternatives Considered

Manual testing — insufficient for regressions.

Additional Context

Collect timings to ensure the loop doesn't drift under load.

Checklist

• I have searched for a similar feature request and didn't find any duplicates.
• I have included all the required information.
• I have tagged the issue with the label "enhancement".