Initializer test is missing
There is currently no test verifying that the initializer (e.g as it is generated by rails g mobility:install is correct.
Ref: https://github.com/shioyama/mobility/issues/410#issuecomment-655535732
Just to clarify (because I understand what you mean but it might not be clear to others), there is an install generator spec, the problem is that it doesn't actually run the generator, it just checks that the file it generates matches what the specs test for.
Currently on master, the spec passes but actually the install generator does not run correctly. This needs to be fixed but I'm putting it off until I finish cleaning up some other stuff so that everything can change together.