Without this workaround, I had three failed tests:
3 unexpected results:
FAILED ein:notebook-ask-before-kill-emacs-simple
FAILED ein:notebook-from-json-simple
FAILED ein:notebook-yank-cell-command-two-buffers
These tests failed because of the following same error:
(error "fun-var-sym=mumamo-eval-in-ein:notebook-bg-mode, use-major-entry=(ein:notebook-bg-mode (mumamo-eval-in-ein:notebook-bg-mode mumamo-def-eval-in-ein:notebook-bg-mode mumamo-kw-eval-in-ein:notebook-bg-mode))")