Skip this test, as it's flaky and causes FTBFS when it fails.
See: https://github.com/jaseg/python-mpv/issues/286
Index: python-mpv/tests/test_mpv.py
===================================================================
--- python-mpv.orig/tests/test_mpv.py
+++ python-mpv/tests/test_mpv.py
@@ -915,6 +915,7 @@ class CommandTests(MpvTestCase):
 
 class RegressionTests(MpvTestCase):
 
+    @unittest.skip('Flaky')
     def test_wait_for_property_concurrency(self):
         players = [mpv.MPV(vo=testvo, loglevel='debug', log_handler=timed_print()) for i in range(2)]