My minimum Gemfile needs for MiniTest

factories.rb

FactoryGirl.define do

  factory :object do
    
  end

end

Gemfile

group :development, :test do
  gem 'sqlite3'
  gem 'trinidad', :platform => :jruby
  gem 'unicorn',  :platform => :ruby
  gem 'better_errors'
  gem 'binding_of_caller'
  gem 'awesome_print'
  gem 'rake'
  gem 'pry',       :require => false
  gem 'chef'
end

group :test do
  # Pretty printed test output
  gem 'turn', :require => false
  gem 'minitest'
  gem 'forgery'
  gem 'rspec'
  gem 'minitest'
  gem 'minitest-rails'
  gem 'guard'
  gem 'guard-bundler'
  gem 'guard-minitest'
  gem 'guard-livereload'
  if RUBY_PLATFORM =~ /darwin/
    gem 'rb-fsevent','~> 0.9.1'
  elsif RUBY_PLATFORM =~ /linux/
    gem 'rb-inotify'
  end
  gem 'factory_girl_rails'
end

Guardfile

# More info at https://github.com/guard/guard#readme

notification :tmux,
  :display_message => true,
  :timeout => 5, # in seconds
  :default_message_format => '%s >> %s',
  # the first %s will show the title, the second the message
  # Alternately you can also configure *success_message_format*,
  # *pending_message_format*, *failed_message_format*
  :line_separator => ' > ', # since we are single line we need a separator
  :color_location => 'status-left-bg' # to customize which tmux element will change color

group :frontend do

  guard :bundler do
    watch('Gemfile')
  end

  guard :livereload do
    watch(%r{^app/.+\.(erb|haml)})
    watch(%r{^app/helpers/.+\.rb})
    watch(%r{^public/.+\.(css|js|html)})
    watch(%r{^config/locales/.+\.yml})
  end
end

group :backend do

end

guard 'minitest' do
  # with Minitest::Unit
  watch(%r|^test/(.*)\/?test_(.*)\.rb|)
  watch(%r|^lib/(.*)([^/]+)\.rb|)     { |m| "test/#{m[1]}test_#{m[2]}.rb" }
  watch(%r|^test/test_helper\.rb|)    { "test" }

  # Rails 3.2
  watch(%r|^app/controllers/(.*)\.rb|) { |m| "test/controllers/#{m[1]}_test.rb" }
  watch(%r|^app/helpers/(.*)\.rb|)     { |m| "test/helpers/#{m[1]}_test.rb" }
  watch(%r|^app/models/(.*)\.rb|)      { |m| "test/unit/#{m[1]}_test.rb" }
end

sample_unit_test.rb

require 'test_helper'

class SampleUnitTest < MiniTest::Spec

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'

# Uncomment if you want awesome colorful output
require "minitest/pride"

class MiniTest::Spec
  include FactoryGirl::Syntax::Methods
end

# include Devise::TestHelpers # use this if you have devise

class DateTime
  include Comparable
end

# use awesome print
require 'awesome_print'

module MiniTest::Assertions
  def mu_pp(obj)
    obj.awesome_inspect
  end
end