Minitest stub_any_instance and methods?

Question

If I do

Klass.stub_any_instance(:new, raise(RuntimeError) do
  ...
end

the RuntimeError is raised at the stub_any_instance line and not, as I would like, later when a Klass.new() occurs.

Is there a way to make this work the way I would like?

Answer 1

Wrap the raise in a lambda:

Klass.stub :new, -> { raise(RuntimeError) } do
  assert_raise { Klass.new }
end

(You'll also want to use stub rather than stub_any_instance.)