plugin = bt2.find_plugin('text', find_in_user_dir=False, find_in_sys_dir=False)
assert plugin is not None
cc = plugin.source_component_classes['dmesg']
assert cc is not None
with self.assertRaises(ValueError):
plugin = bt2.find_plugin('text', find_in_user_dir=False, find_in_sys_dir=False)
assert plugin is not None
cc = plugin.source_component_classes['dmesg']
assert cc is not None
with self.assertRaises(ValueError):