def METHOD_NAME(self):
    """
    Test whether the manager can remove an existing plugin from the system.
    """
    plugin = Plugin.objects.get(meta__name=self.plugin_fs_name, version="0.1")
    self.pl_manager.remove_plugin(plugin.id)
    self.assertEqual(Plugin.objects.count(), 0)
    self.assertEqual(PluginMeta.objects.count(), 0)
    self.assertEqual(PluginParameter.objects.count(), 0)