Use minitest/spec with Rails 3

person_test.rb

require 'test_helper'
require 'minitest/autorun'

class MiniTest::Spec
  include ActiveSupport::Testing::SetupAndTeardown
  include ActiveRecord::TestFixtures

  alias :method_name :__name__ if defined? :__name__
  self.fixture_path = File.join(Rails.root, 'test', 'fixtures')
end

describe 'holy shit' do
  fixtures :people

  it 'does awesome stuff' do
    1.must_equal 1
  end

  it 'finds a fixture' do
    people(:one).name.must_equal 'America!'
  end
end