added an expectation of a 200 code to the `I am at' definition.

Author: rebelwarrior

Diff for: lib/cucumber/sinatra/templates/features/step_definitions/web_steps.rbt

@@ -18,6 +18,7 @@ World(WithinHelpers)
 
 Given /^(?:|I )am on (.+)$/ do |page_name|
   visit path_to(page_name)
+  expect(page.status_code).to eq(200)
 end
 
 When /^(?:|I )go to (.+)$/ do |page_name|