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/support/env.rb

@@ -1,11 +1,27 @@
+require_relative '../../.env'
+ENV["DB_NAME"] = "test_#{ENV["DB_NAME"]}"
 require_relative '../../app'
 require 'rubygems'
 require 'roda'
+require 'sequel'
 require 'capybara'
 require 'capybara/dsl'
 require 'rspec'
 
+# DB initialization
+Sequel.extension :migration
+Sequel.sqlite("db/#{ENV['DB_NAME']}") do |db|
+  Sequel::Migrator.apply(db, "db/migrations")
+end
 
+# RSpec db setup
+RSpec.configure do |c|
+  c.around(:each) do |example|
+    DB.transaction(rollback: :always, auto_savepoint: true){example.run}
+  end
+end
+
+# attach app to Capybara
 Capybara.app = App
 
 include Capybara::DSL