def test_addRemoveOutputDevicePlugin():
manager = OutputDeviceManager()
plugin_1 = OutputDevicePlugin()
plugin_1.setPluginId("plugin_one")
plugin_1.start = MagicMock()
plugin_1.stop = MagicMock()
manager.addOutputDevicePlugin(plugin_1)
assert manager.getOutputDevicePlugin("plugin_one") == plugin_1
assert plugin_1.start.call_count == 1
# adding it again shouldn't cause the start to be called again!
manager.addOutputDevicePlugin(plugin_1)
assert plugin_1.start.call_count == 1
manager.removeOutputDevicePlugin("plugin_one")
assert manager.getOutputDevicePlugin("plugin_one") is None
assert plugin_1.start.call_count == 1
# And removing it again shouldn't cause issues.
manager.removeOutputDevicePlugin("plugin_two")
assert plugin_1.start.call_count == 1
# As the default output device plugin is an interface, the start and stop will raise exceptions.
# but the outputdevice manager should be robust against that, so even in that case it shouldn't fail!
plugin_2 = OutputDevicePlugin()
plugin_2.setPluginId("plugin_two")
manager.addOutputDevicePlugin(plugin_2)
manager.removeOutputDevicePlugin("plugin_two")
