Add --only task_id={number} to useful mix test options (#1531)

* Add `--only task_id={number}` to useful `mix test` options * Update docs/TESTS.md --------- Co-authored-by: Angelika Cathor <[email protected]>
exercism · Oct 14, 2024 · 3421ff1 · 3421ff1
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diff --git a/docs/TESTS.md b/docs/TESTS.md
@@ -129,6 +129,7 @@ Documentation:
   in the same order they were defined in
 * `--stale` - runs only tests which reference modules that changed since the last
   time tests were ran with `--stale`
+* `--only task_id:1` - or with another number, on learning exercises runs only the tests associated with the specific task
 
 Documentation: