安装rspec gem，把后面的代码保存为file1.rb, 然后运行：

rpsec file1.rb

可以看到彩色效果。

require 'rspec'


RSpec.configure do |config|
  config.color = true
#  config.mock_framework = :rspec
end

class Item
  attr_accessor :name
  def initialize(name)
    self.name = name
  end 
end

describe Item do
  let(:x) { 1 }
  it "should be created by name" do
    item = Item.new("bar")
    expect(item.name).to eq("bar")
    #item.name.should == "bar"
  end 
end