MSR: Add `/tests` convention to ReadMe
@@ -42,6 +42,10 @@ the third command, which will fail with exit code `1`, since it tries to delete
value the last command prints to the standard error output, since we specified the expected text `Did not find the key` via the special
comment `# STDERR:`.
+## Conventions
+
+- Only add tests that store data below `/tests` (See also [TESTING.md](/doc/TESTING.md)).
+
## Add a Test
If you want to add a Markdown Shell Recorder tests for the `README.md` of your plugin, you can simply pass
