update for features

+ added flash/message assertions
+ adjusted urls to be http://google.com for tests for now
+ added @db-test tags to tests that use db interactions
+ added a scenario for duplicate URLs being used
+ added before and after steps to init and clean up db tests
+ added initialization of a test db for tests instead of interacting
  with the production database

features/step_definitions/steps.rb

@@ -1,9 +1,18 @@
+# BEFORE
+Before('@db-test') do
+  @links = Sequel.sqlite("db/#{ENV['DB_NAME']}")[:links]
+end
+
 # GIVEN
 
 Given('I visit the {string} page') do |string|
   visit string
 end
 
+Given('A link already exists with the url {string}') do |string|
+  @links.insert(url: string, code: "aaaaaa")
+end
+
 # WHEN
 
 When('I click the {string} button') do |string|
@@ -31,3 +40,13 @@ end
 Then('I should be on {string} page') do |string|
   page.should have_current_path string
 end
+
+Then('I should see the message {string}') do |message|
+  page.should have_selector '#message', text: message
+end
+
+# AFTER
+
+After('@db-test') do
+  @links.delete
+end