eugenegujing opened a new pull request, #7312:
URL: https://github.com/apache/texera/pull/7312

   ### What changes were proposed in this PR?
   
   Adds `CoordinatorTimerServiceSpec` (new, 13 tests) for 
`amber/src/main/scala/org/apache/texera/amber/engine/architecture/coordinator/CoordinatorTimerService.scala`,
 which had no spec. 
   
   No production code is changed.
   
   The spec substitutes a `PekkoActorService` that records 
`sendToSelfWithFixedDelay` requests instead of registering real repeating 
timers, and returns a fresh recording `Cancellable` per call. A real 
`ActorContext` comes from a minimal Pekko TestKit actor, since 
`PekkoActorService` dereferences `self`/`dispatcher` eagerly and there is no 
Mockito in the amber test tree. Every timing decision the class makes is taken 
synchronously at the `enable`/`disable` call, so the suite needs no real timers 
and no sleeps.
   
   Covered:
   
   - **Scheduling decision** — an unconfigured interval schedules nothing; a 
configured one schedules exactly once with initial delay 0, the configured 
period, and a `ControlInvocation` of 
`METHOD_COORDINATOR_INITIATE_QUERY_STATISTICS` carrying 
`QueryStatisticsRequest(Seq.empty, target)` and `AsyncRPCContext(SELF, SELF)`.
   - **The two entry points do not cross** — `enableStatusUpdate` uses 
`statusUpdateIntervalMs` with `UI_ONLY`, `enableRuntimeStatisticsCollection` 
uses `runtimeStatisticsPersistenceIntervalMs` with `PERSISTENCE_ONLY`, asserted 
separately and with distinct intervals; an asymmetric config (only one interval 
set) leaves the other timer unscheduled.
   - **Idempotence** — a second `enable` while the timer runs adds no schedule 
and keeps the same `Cancellable` instance.
   - **Disable** — cancels the handle and resets it to `None`, including when 
`cancel()` returns `false` (the return value is discarded by `disableTimer`); a 
second disable and a disable of a never-enabled timer are both no-ops.
   - **Restart and lifecycle** — a disabled timer can be enabled again, for 
both timers; a full pause-resume cycle re-schedules both with their own target 
and interval.
   - **Independence** — disabling one timer leaves the other's handle installed 
and un-cancelled, in both directions.
   
   ### Any related issues, documentation, discussions?
   
   Closes #7311.
   
   ### How was this PR tested?
   
   ```
   sbt "WorkflowExecutionService/testOnly 
org.apache.texera.amber.engine.architecture.coordinator.CoordinatorTimerServiceSpec"
   # 13 tests, all passed (~0.6 s)
   
   sbt "WorkflowExecutionService/testOnly 
org.apache.texera.amber.engine.architecture.coordinator.*"
   # 18 suites, 146 tests, all passed — the new top-level test helpers do not 
clash with the neighboring specs
   
   sbt "WorkflowExecutionService/Test/scalafmtCheck"
   # 173 sources, clean
   ```
   
   ### Was this PR authored or co-authored using generative AI tooling?
   
   Co-authored by: Claude Code (Fable 5)


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