…file is placed in the command
## Description
see included doc; placing the playlist filename at the end of command
just isn't working for all players
I have this in use with `mpv`
Co-authored-by: cvx35isl <cvx35isl@users.noreply.github.com>
Co-authored-by: J0J0 Todos <2733783+JOJ0@users.noreply.github.com>
External Python packages interfacing beets may want to use an in-memory
beets library instance for testing beets-related code.
The `TestHelper` class is very helpful for this purpose.
Previously `TestHelper` was located in the `test/` directory.
Now it is part of `beets` itself (`beets.test.helper.TestHelper`) and
can be easily imported.
