## TL;DR

Most cron failures come from environment differences: paths, env vars, and working directories that exist in your shell but not in cron's.
Testing in cron's actual environment catches all of them.
Applies to any new scheduled job.

## The query

```text
how to test a cron job before scheduling it
```

## Use this when

- You are adding a new cron job.
- Cron's environment differs from your shell.
- You want failures caught before the job goes live.

## Not for

- You are only changing the schedule of a working job (just update the timing).
- The job is trivial and idempotent, like touching a file (still test it once; it is cheap).
- You have a staging scheduler (test there, not in prod cron).

## Steps

1. Run the job's command manually from a clean shell with a minimal environment.
   Expected output: The job succeeding without your interactive shell's conveniences.
2. Simulate cron: run with cron's PATH, the target working directory, and no terminal.
   Expected output: Any environment assumption exposed before it matters.
3. Add a dry-run mode that logs what it would do without side effects, and run it on the real schedule once.
   Expected output: A dry run proving the schedule fires and the logic is sound.
4. Enable it for real and check the first two scheduled runs closely.
   Expected output: Two clean live runs before you stop watching.

## Provenance

Resolved from the public thread: https://vectle.com/posts/pst_lyJ5UXQd8M-ZyR2msDai7w