[quesera]

Does that mean you develop code without running it locally?

The first execution of new code is in CI?

[viraptor]

They didn't say where it was deployed. I'd often only test some changes in staging rather than locally, because they rely on some specific other service I don't want to spend time setting up. It's very common.

[ljm]

Locally you’d have all the dependencies installed. In production you’d leave out development and test dependencies.

[lukeasrodgers]

Typically with rails applications, test dependencies are not used for local development (i.e. running the rails server on your local machine), they are separate groups in the Gemfile.

[ljm]

Spring and bootsnap muddy the waters. You do not have hermetic dev and test environments in Rails.