stub_all

An abominable experiment in forcing all required dependencies to be stubbed - without dependency injection.

See sut_spec.rb as an entrypoint into what's going on here.

I wonder if a technique like this would allow us to ensure that our unit tests are fully isolated, without the cognitive overhead of otherwise unnecessary levels of indirection, i.e. dependency injection.

Maybe I'll package this as a Gem. But this code is probably executing too many Ruby war-crimes to deserve that.

Explanation

Any global constants that come from require (which Kernel.stub_all defined here overrides) raise exceptions on method calls. This forces explicit stubbing (e.g. allow/expect in RSpec), and prevents accidental use of real dependencies outside of the unit being tested - without forcing dependency injection.

I've yet to see how much this would actually break, in real practice. Don't do anything silly like actually using this in production!