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Body Context: My request spec failed: `Failure/Error: expect(response).to render_template(:new) ... assert_template has been extracted to a gem. To continue using it, add `gem 'rails-controller-testing'` to your Gemfile.` The `render_template` matcher in RSpec request specs relies on functionality (`assert_template`) that is no longer part of Rails core. Resolution: I added `gem 'rails-controller-testing'` to the `:test` group in the `Gemfile` and ran `bundle install`. Learning: I learned to be aware that testing helpers previously included in Rails core might be extracted into separate gems in newer versions. Error messages usually indicate the required gem (`rails-controller-testing` for `render_template`, `assigns`, `assert_template`).

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