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.
Another incorrect py2 -> py3 translation. Since python 3 attached the
traceback to the exception, this should preserve the traceback without
needing to resort to sys.exc_info
This was a vestige from when we used to need the unittest2 library for pre-2.7
compatibility. Now that we require Python 2.7, we aren't using that library
and this indirection wasn't doing any good.
This reverts commit 9c41c39913.
That commit used byte strings for the `if __name__ == '__main__'` pattern,
which was necessary when we were doing unicode_literals. But it is wrong on
Python 3, and now that we're liberated from unicode_literals, we need to go
back to native strings for this comparison.
Set the verbosity in the config from the beginning.
Use self-made barriers (DummyPlugin.step1, DummyPlugin.step2) and
Thread.join() to ensure everything is going as expected.
In ConcurrentEventsTest.test_concurrent_events listener1 sometimes has a
wrong log level. However the AssertionError is raised in a thread and
not the main one, so the test seems passing while it should fail.
By storing the exception and raising it later we solve that issue,
allowing to fix the random fail.
'verbose' is now an int and not a boolean. '-v' is level 1, '-vv' level
2. In the configuration it can be set with 'verbose: 1' or 'verbose: 2'.
Improve #1244: auditing current log levels of plugins remains.
Listeners get logging level modulations, like import_stages already did.
Add extensive tests:
- explicit plugin commands are logged like core beets (INFO or DEBUG)
- import stages are more silent
- event listeners are like import stages
Delete @BeetsPlugin.listen decorator since listeners need plugin instance
context to set its logging level.
Improve #1244. Next is multiple verbosity levels.
Include import of __future__ features division, absolute_imports and
print_function everywhere. Don't add unicode_literals yet for it is
harder to convert.
Goal is smoothing the transition to python 3.
