email_worker_spec.rb

require 'spec_helper'

# it's important to add the ':worker => true' setting so tests don't run in a transaction. This is configured in spec_helper
describe EmailWorker, :worker => true do

  before(:each) do
    @user = FactoryGirl.create :user
  end

  let(:worker){ EmailWorker.new }

  describe "#perform" do
    it "delivers an email" do
      expect{
        worker.perform(@user.id)
      }.to change{ ActionMailer::Base.deliveries.size }.by(1)
    end
  end
end

spec_helper.rb

# This file is copied to spec/ when you run 'rails generate rspec:install'
ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", __FILE__)
require 'rspec/rails'
require 'rspec/autorun'
require 'sucker_punch/testing'


# Requires supporting ruby files with custom matchers and macros, etc,
# in spec/support/ and its subdirectories.
Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}


RSpec.configure do |config|
  # ## Mock Framework
  #
  # If you prefer to use mocha, flexmock or RR, uncomment the appropriate line:
  #
  # config.mock_with :mocha
  # config.mock_with :flexmock
  # config.mock_with :rr

  # If you're not using ActiveRecord, or you'd prefer not to run each of your
  # examples within a transaction, remove the following line or assign false
  # instead of true.
  config.use_transactional_fixtures = false

  config.before(:suite) do
    DatabaseCleaner.clean_with(:truncation)
  end

  config.before(:each) do
    DatabaseCleaner.strategy = :transaction
  end

  # SuckerPunch workers can't be run inside a transaction as they are executed on a separate thread
  config.before(:each, :worker => true) do
    DatabaseCleaner.strategy = :truncation
  end

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

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

  config.after do
    SuckerPunch.reset! # => Resets the queues and jobs in the queues before each test
  end

  # If true, the base class of anonymous controllers will be inferred
  # automatically. This will be the default behavior in future versions of
  # rspec-rails.
  config.infer_base_class_for_anonymous_controllers = false

end