Use customer RSpec matchers in cucumber

features/capybara.feature

@@ -16,3 +16,8 @@ Feature: Capybara's cucumber integration
   Scenario: selenium tag
     When I visit the root page
     Then Capybara should use the "selenium" driver
+
+  Scenario: matchers
+    When I visit the root page
+    And I use a matcher that fails
+    Then the failing exception should be nice

features/step_definitions/capybara_steps.rb

@@ -9,3 +9,16 @@ end
 Then /^Capybara should use the "([^"]*)" driver$/ do |driver|
   Capybara.current_driver.should == driver.to_sym
 end
+
+When /^I use a matcher that fails$/ do
+  begin
+    page.should have_css('h1#doesnotexist')
+  rescue StandardError => e
+    @error_message = e.message
+  end
+end
+
+Then /^the failing exception should be nice$/ do
+  @error_message.should =~ %r(expected css \"h1#doesnotexist\" to return)
+end
+

lib/capybara/cucumber.rb

@@ -1,7 +1,9 @@
 require 'capybara'
 require 'capybara/dsl'
+require 'capybara/rspec_matchers'
 
 World(Capybara)
+World(Capybara::RSpecMatchers)
 
 After do
   Capybara.reset_sessions!