Is there a way that I can stub all the calls to a method except from the first one?

[Panayotis Matsinopoulos]

Hi,

Is there a way that I can stub all the calls to a method except from the first one?

Example:

    class Book
      def foo
        "Book#foo()"
      end
    end

In spec:

    it 'x' do
      # .... (do something to stub all but the first method call to `Book#foo`)....

      b = Book.new
      expect(b.foo).to eq('Book#foo()')
      expect(b.foo).to be_nil
      expect(b.foo).to be_nil
    end

Thanks in advance
Panayotis

[Aaron Kromer]

Can you provide a more concrete example? In general, this would make me a bit uneasy about what is either being tested or how the system is joined together.

If you there are no side effects and you just have a basic value, why not just stub the basic return?

class Foo
  def hello
    :foo
  end
end

it do
  f = Foo.new

  allow(f).to receive(:hello).and_return(:foo, nil)

  expect(f.hello).to be :foo
  expect(f.hello).to be nil
  expect(f.hello).to be nil

end

If there are no side effects, but something needs to be calculated first, possibly call it first?

it do

  f = Foo.new

  allow(f).to receive(:hello).and_return(f.hello, nil)

  expect(f.hello).to be :foo
  expect(f.hello).to be nil
  expect(f.hello).to be nil

end

Otherwise, it’s probably best for you to fall back to Ruby and just define a singleton method:

it do
  f = Foo.new
  f.define_singleton_method(:hello) do
    return if @already_called
    @already_called = true
    super()  # parens are necessary to make Ruby happy
  end

  expect(f.hello).to be :foo
  expect(f.hello).to be nil
  expect(f.hello).to be nil
end

Maybe someone else has some other ideas here.

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