Backup the class cache when using register_temp_plugin, so as to not introduce cross-test dependencies
Backup the class cache when using register_temp_plugin, so as to not introduce cross-test dependencies

4eek/XBlock,mitodl/XBlock,nagyistoce/edx-XBlock,EDUlib/XBlock,mitodl/XBlock,edx/XBlock,edx-solutions/XBlock,EDUlib/XBlock,lovehhf/XBlock,edx-solutions/XBlock,nagyistoce/edx-XBlock,4eek/XBlock,edx/XBlock,lovehhf/XBlock