Gemfile

# instead of debugger, you could use byebug gem
# and then you do not need to require debugger
group :development, :test do
  gem 'minitest'
  gem 'awesome_print'
  gem 'capybara'
  gem 'database_cleaner', '~> 1.0'
  gem 'debugger'
  gem 'factory_girl_rails'
  gem 'hirb'
  gem 'mailcatcher'
  gem 'minitest-reporters'
end

test_helper.rb

ENV["RAILS_ENV"] ||= "test"
require File.expand_path('../../config/environment', __FILE__)
require 'rails/test_help'
require 'minitest/autorun'
require 'minitest/spec'
require 'debugger'
require 'capybara/rails'

# require 'valid_attribute'

# Turn like output reporter. More options, check: http://rubydoc.info/gems/minitest-reporters/0.4.0/file/README.md
require 'minitest/reporters'
MiniTest::Reporters.use! MiniTest::Reporters::SpecReporter.new

# Require ruby files in support dir.
Dir[File.expand_path('test/support/*.rb')].each { |file| require file }

DatabaseCleaner.strategy = :truncation

class MiniTest::Spec
  ActiveRecord::Migration.check_pending!
  include FactoryGirl::Syntax::Methods

  # minitest-matchers. so we can use: have_valid()
  # include ValidAttribute::Method

  before :each do
    DatabaseCleaner.clean
  end

  def show(object, label=nil)
    ap "#{label}:" if label
    ap object
  end

  class << self
    alias context describe
  end
end

class HelperTest < MiniTest::Spec
  include ActiveSupport::Testing::SetupAndTeardown
  include ActionView::TestCase::Behavior
  register_spec_type(/Helper$/, self)
end

class IntegrationTest < MiniTest::Spec
  include Rails.application.routes.url_helpers
  include Capybara::DSL
  register_spec_type(/integration$/, self)

  before { setup_integration_env }
end