Works great, but breaks RSpec controller tests: "undefined local variable or method `autocomplete_position_name_positions_path'"

[ghost]

Everything works fine when testing it manually in the browser, but it seems to break my RSpec controller tests:

require 'spec_helper'

describe "positions/new" do
  before(:each) do
    assign(:position, stub_model(Position,
      :project_id => 1,
      :task_id => 1,
      :name => "MyString"
    ).as_new_record)
  end

  it "renders new position form" do
    render

    # Run the generator again with the --webrat flag if you want to use webrat matchers
    assert_select "form", :action => positions_path, :method => "post" do
      assert_select "input#position_project_id", :name => "position[project_id]"
      assert_select "input#position_name", :name => "position[name]"
    end
  end
end

This results in

  2) positions/new renders new position form
     Failure/Error: render
     ActionView::Template::Error:
       undefined local variable or method `autocomplete_position_name_positions_path' for #<#<Class:0x007fa6ce48e1e0>:0x007fa6cfab6710>

Any idea how to solve this? Thank you.