# module ActionDispatch::Assertions::RoutingAssertions

Suite of assertions to test routes generated by Rails and the handling of requests made to them.

### Public Instance Methods

assert_generates(expected_path, options, defaults={}, extras = {}, message=nil) click to toggle source

Asserts that the provided options can be used to generate the provided path. This is the inverse of `assert_recognizes`. The `extras` parameter is used to tell the request the names and values of additional request parameters that would be in a query string. The `message` parameter allows you to specify a custom error message for assertion failures.

The `defaults` parameter is unused.

#### Examples¶ ↑

    # Asserts that the default action is generated for a route with no action
    assert_generates "/items", :controller => "items", :action => "index"

    # Tests that the list action is properly routed
    assert_generates "/items/list", :controller => "items", :action => "list"

    # Tests the generation of a route with a parameter
    assert_generates "/items/list/1", { :controller => "items", :action => "list", :id => "1" }

    # Asserts that the generated route gives us our custom route
    assert_generates "changesets/12", { :controller => 'scm', :action => 'show_diff', :revision => "12" }

    # File lib/action_dispatch/testing/assertions/routing.rb, line 71
    def assert_generates(expected_path, options, defaults={}, extras = {}, message=nil)
      if expected_path =~ %r{://}
        begin
          uri = URI.parse(expected_path)
          expected_path = uri.path.to_s.empty? ? "/" : uri.path
        rescue URI::InvalidURIError => e
          raise ActionController::RoutingError, e.message
        end
      else
        expected_path = "/#{expected_path}" unless expected_path.first == '/'
      end
      # Load routes.rb if it hasn't been loaded.

      generated_path, extra_keys = @routes.generate_extras(options, defaults)
      found_extras = options.reject {|k, v| ! extra_keys.include? k}

      msg = build_message(message, "found extras <?>, not <?>", found_extras, extras)
      assert_equal(extras, found_extras, msg)

      msg = build_message(message, "The generated path <?> did not match <?>", generated_path,
          expected_path)
      assert_equal(expected_path, generated_path, msg)
    end

assert_recognizes(expected_options, path, extras={}, message=nil) click to toggle source

Asserts that the routing of the given `path` was handled correctly and that the parsed options (given in the `expected_options` hash) match `path`. Basically, it asserts that Rails recognizes the route given by `expected_options`.

Pass a hash in the second argument (`path`) to specify the request method. This is useful for routes requiring a specific HTTP method. The hash should contain a :path with the incoming request path and a :method containing the required HTTP verb.

    # assert that POSTing to /items will call the create action on ItemsController
    assert_recognizes({:controller => 'items', :action => 'create'}, {:path => 'items', :method => :post})

You can also pass in `extras` with a hash containing URL parameters that would normally be in the query string. This can be used to assert that values in the query string string will end up in the params hash correctly. To test query strings you must use the extras argument, appending the query string on the path directly will not work. For example:

    # assert that a path of '/items/list/1?view=print' returns the correct options
    assert_recognizes({:controller => 'items', :action => 'list', :id => '1', :view => 'print'}, 'items/list/1', { :view => "print" })

The `message` parameter allows you to pass in an error message that is displayed upon failure.

#### Examples¶ ↑

    # Check the default route (i.e., the index action)
    assert_recognizes({:controller => 'items', :action => 'index'}, 'items')

    # Test a specific action
    assert_recognizes({:controller => 'items', :action => 'list'}, 'items/list')

    # Test an action with a parameter
    assert_recognizes({:controller => 'items', :action => 'destroy', :id => '1'}, 'items/destroy/1')

    # Test a custom route
    assert_recognizes({:controller => 'items', :action => 'show', :id => '1'}, 'view/item1')

    # File lib/action_dispatch/testing/assertions/routing.rb, line 41
    def assert_recognizes(expected_options, path, extras={}, message=nil)
      request = recognized_request_for(path, extras)

      expected_options = expected_options.clone
      extras.each_key { |key| expected_options.delete key } unless extras.nil?

      expected_options.stringify_keys!
      msg = build_message(message, "The recognized options <?> did not match <?>, difference: <?>",
          request.path_parameters, expected_options, expected_options.diff(request.path_parameters))
      assert_equal(expected_options, request.path_parameters, msg)
    end

assert_routing(path, options, defaults={}, extras={}, message=nil) click to toggle source

Asserts that path and options match both ways; in other words, it verifies that `path` generates `options` and then that `options` generates `path`. This essentially combines `assert_recognizes` and `assert_generates` into one step.

The `extras` hash allows you to specify options that would normally be provided as a query string to the action. The `message` parameter allows you to specify a custom error message to display upon failure.

#### Examples¶ ↑

    # Assert a basic route: a controller with the default action (index)
    assert_routing '/home', :controller => 'home', :action => 'index'

    # Test a route generated with a specific controller, action, and parameter (id)
    assert_routing '/entries/show/23', :controller => 'entries', :action => 'show', :id => 23

    # Assert a basic route (controller + default action), with an error message if it fails
    assert_routing '/store', { :controller => 'store', :action => 'index' }, {}, {}, 'Route for store index not generated properly'

    # Tests a route, providing a defaults hash
    assert_routing 'controller/action/9', {:id => "9", :item => "square"}, {:controller => "controller", :action => "action"}, {}, {:item => "square"}

    # Tests a route with a HTTP method
    assert_routing({ :method => 'put', :path => '/product/321' }, { :controller => "product", :action => "update", :id => "321" })

    # File lib/action_dispatch/testing/assertions/routing.rb, line 117
    def assert_routing(path, options, defaults={}, extras={}, message=nil)
      assert_recognizes(options, path, extras, message)

      controller, default_controller = options[:controller], defaults[:controller]
      if controller && controller.include?(?/) && default_controller && default_controller.include?(?/)
        options[:controller] = "/#{controller}"
      end

      generate_options = options.dup.delete_if{ |k,v| defaults.key?(k) }
      assert_generates(path.is_a?(Hash) ? path[:path] : path, generate_options, defaults, extras, message)
    end

method_missing(selector, *args, &block) click to toggle source

ROUTES TODO: These assertions should really work in an integration context

Calls superclass method

    # File lib/action_dispatch/testing/assertions/routing.rb, line 172
    def method_missing(selector, *args, &block)
      if defined?(@controller) && @controller && @routes && @routes.named_routes.helpers.include?(selector)
        @controller.send(selector, *args, &block)
      else
        super
      end
    end

with_routing() { |routes| ... } click to toggle source

A helper to make it easier to test different route configurations. This method temporarily replaces @routes with a new RouteSet instance.

The new instance is yielded to the passed block. Typically the block will create some routes using `map.draw { map.connect ... }`:

    with_routing do |set|
      set.draw do |map|
        map.connect ':controller/:action/:id'
          assert_equal(
            ['/content/10/show', {}],
            map.generate(:controller => 'content', :id => 10, :action => 'show')
        end
      end
    end

    # File lib/action_dispatch/testing/assertions/routing.rb, line 146
    def with_routing
      old_routes, @routes = @routes, ActionDispatch::Routing::RouteSet.new
      if defined?(@controller) && @controller
        old_controller, @controller = @controller, @controller.clone
        _routes = @routes

        # Unfortunately, there is currently an abstraction leak between AC::Base
        # and AV::Base which requires having the URL helpers in both AC and AV.
        # To do this safely at runtime for tests, we need to bump up the helper serial
        # to that the old AV subclass isn't cached.
        #
        # TODO: Make this unnecessary
        @controller.singleton_class.send(:include, _routes.url_helpers)
        @controller.view_context_class = Class.new(@controller.view_context_class) do
          include _routes.url_helpers
        end
      end
      yield @routes
    ensure
      @routes = old_routes
      if defined?(@controller) && @controller
        @controller = old_controller
      end
    end