RuntimeError: can't modify frozen Array when running rspec in rails 5.1

Question

I recently upgraded to Rails 5.1 from v4.3 and am now getting this error when running tests:

An error occurred while loading 

./spec/controllers/admin/capac         


        

Answer 1

For me it was a FactoryBot update from version 4 to 5. I didn't see the deprecation warning because I jumped versions:

DEPRECATION WARNING: Static attributes will be removed in FactoryBot 5.0.