Zepp-Hanzj opened a new pull request, #3639:
URL: https://github.com/apache/nuttx-apps/pull/3639
## Summary
Add focused cmocka coverage for the watchdog timeout notifier chain and an
independent watchdog-only drivertest configuration.
## Changes
- Add `CONFIG_TESTING_DRIVER_TEST_WATCHDOG_ONLY`.
- When enabled, register only `cmocka_driver_watchdog` from the drivertest
Makefile/CMake rules.
- Add notifier tests covering:
- priority ordering;
- duplicate registration suppression;
- repeated timeout delivery;
- unregistering one notifier while preserving the others;
- `WATCHDOG_NOTIFIER_ACTION` propagation;
- `data == NULL` propagation;
- concurrent register/timeout/unregister activity.
- Guard reset-cause assertions so the notifier-only simulator configuration
does not require board reset-cause support.
## Validation
The test was run using the companion NuttX simulator configuration, which
registers only the watchdog cmocka driver. The final result was:
```text
[==========] tests: 2 test(s) run.
[ PASSED ] 2 test(s).
```
The race test repeatedly interleaves timeout delivery with notifier
registration and unregistration and asserts that callbacks remain valid and
receive a `NULL` payload.
Additional hardware-path validation was performed in the companion NuttX PR
on STM32F407 WWDG hardware. The corresponding UART logs and screenshots are
linked there:
- [NuttX core PR #1](https://github.com/Zepp-Hanzj/nuttx/pull/1)
- [Simulator notifier race
log](https://github.com/Zepp-Hanzj/nuttx/blob/fix/watchdog-capture-automonitor-notifier/docs/validation-evidence/watchdog/06-simulator-notifier-race-0714.log)
## Scope
This PR contains only watchdog notifier tests and their test
registration/configuration. Unrelated `O_RDONLY` compatibility changes are
intentionally excluded.
## Merge order
Merge the companion NuttX core PR first, then enable this test configuration
in CI or simulator validation.
## Checklist
- [x] Makefile and CMake registration paths updated consistently.
- [x] Watchdog-only configuration does not register unrelated drivertest
applications.
- [x] `git diff --check` passes.
- [x] Simulator cmocka notifier and race tests pass.
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