Using transactional DB cleanup

database_cleaner.rb

# spec/support/database_cleaner.rb
require 'database_cleaner'

RSpec.configure do |config|
  config.before(:suite) do
    DatabaseCleaner.clean_with :truncation # Delete leftovers if any
    DatabaseCleaner.strategy = :transaction
  end

  config.before(:each) do
    DatabaseCleaner.start
  end

  config.after(:each) do
    DatabaseCleaner.clean
  end
end

spec_helper.rb

# spec/spec_helper.rb
ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", __FILE__)
require 'rspec/rails'

Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}

RSpec.configure do |config|
  config.mock_with :rspec
end