Why am I getting "ArgumentError: wrong number of arguments (1 for 0)" when running my rails functional tests?

Question

I'm stumped on what's causing this. I get this error and stack trace in all my functional tests where I call 'post'. Here is the full stack trace:

  7) Error:
test_should_validate(UsersControllerTest):
ArgumentError: wrong number of arguments (1 for 0)
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route.rb:48:in `to_query'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route.rb:48:in `build_query_string'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route.rb:46:in `each'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route.rb:46:in `build_query_string'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route.rb:233:in `append_query_string'
    generated code (/Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route.rb:154):3:in `generate'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route_set.rb:365:in `__send__'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route_set.rb:365:in `generate'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route_set.rb:364:in `each'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/routing/route_set.rb:364:in `generate'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/url_rewriter.rb:208:in `rewrite_path'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/url_rewriter.rb:187:in `rewrite_url'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/url_rewriter.rb:165:in `rewrite'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/test_process.rb:450:in `build_request_uri'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/test_process.rb:406:in `process'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/actionpack/lib/action_controller/test_process.rb:376:in `post'
    functional/users_controller_test.rb:57:in `test_should_validate'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/activesupport/lib/active_support/testing/setup_and_teardown.rb:60:in `__send__'
    /Users/hisham/src/rails/ftuBackend/vendor/rails/activesupport/lib/active_support/testing/setup_and_teardown.rb:60:in `run'

This is the test I'm running:

 def test_should_validate
    post :validate, :user => { :email => '[email protected]',
      :password => 'quire', :password_confirmation => 'quire', :agreed_to_terms => "true" }
    assert assigns(:user).errors.empty?
    assert_response :success
  end

Answer 1

you're calling test_should_validate with the argument UsersControllerTest, but your test_should_validate function is defined to not take in an argument.

Answer 2

Turns out the gattaca gem broke my functional tests and was the cause of this error.