Rails 5 Test Prescriptions

More Expectation Annotations

RSpec allows a number of different annotations to the expectation part of declaring a test double. You can specify more complex return values or a variety of arguments to the stubbed method.

Stubbing Return Values

A couple of advanced usages of returns might be valuable now and again. If you’ve multiple return values specified, the stubbed method returns one at a time:

mocks/01/spec/models/task_spec.rb

it "stubs with multiple return values" do
  task = Task.new
  allow(task).to receive(:size).and_return(1, 2)
  assert_equal(1, task.size)
  assert_equal(2, task.size)
  assert_equal(2, task.size)
end

The return values of the stubbed method walk through the values passed to and_return. Note that the values ...