Testing Cloudflare Cron Triggers Locally for Push Notification Workflows

This translation relates to testing push notification workflows using Cloudflare Workers Cron Triggers. The goal is to verify the entire process locally without having to wait for the scheduled time. The solution separates the scheduled event from the HTTP route responsible for handling notifications. The main Worker receives the cron event, then forwards it to an internal HTTP route for actual notification processing.

To test locally, use Wrangler with the "--test-scheduled" option. Append "/__scheduled" to the local URL to initiate the test. The cron expression should be provided in the query parameter. Remember that Cloudflare uses UTC time, not JST, so adjust expressions accordingly.

For a more targeted verification, you can call the internal route directly with a POST request. This allows for checking recipient filtering without the need for all the data to be present in the local environment. Authentication for local development is handled separately, using a development value stored in a configuration file instead of the production secret.

When testing, ensure the cron reaches the route, the date is correct after timezone conversion, target schedules and participants are retrieved properly, users without push tokens are filtered out, and external API responses are recorded accurately. The main challenge in cron testing isn't triggering it, but rather coordinating test data with the current time. By separating the core logic into an HTTP route, you can verify event wiring and notification logic independently.