describe('Subscription', function()
  describe('create', function()
    it('returns a Subscription', function()
      local subscription = Rx.Subscription.create()
      expect(subscription).to.be.an(Rx.Subscription)
    end)
  end)

  describe('unsubscribe', function()
    it('runs the function passed to create', function()
      local unsubscribe = spy()
      local subscription = Rx.Subscription.create(unsubscribe)
      subscription:unsubscribe()
      expect(#unsubscribe).to.equal(1)
    end)

    it('does not run the function passed to create more than once', function()
      local unsubscribe = spy()
      local subscription = Rx.Subscription.create(unsubscribe)
      subscription:unsubscribe()
      subscription:unsubscribe()
      subscription:unsubscribe()
      expect(#unsubscribe).to.equal(1)
    end)
  end)
end)