这里只是因为看到当前的项目中有这个神奇的东西，所以试着去写点东西来记录这个过程，结果是有趣的。相比之下，更像是一种有趣的自然语言，看起来有种文档的感觉。放一下官方示例的一个结果，感觉很容易阅读，似乎还有中文，不过我想是用不到了。

[WARNING] MultiJson is using the default adapter (ok_json).We recommend loading a different JSON library to improve performance.
Feature: Hello World Feature
  In order to ensure that my installation works
  As a Developer
  I want to run a quick Cucumber test

  Scenario: Hello World Scenario      # features/basic.feature:6
    Given The Action is Hello         # features/setp_definitions/step_steps.rb:3
    When The Subject is World         # features/setp_definitions/step_steps.rb:7
    Then The Greeting is Hello, World # features/setp_definitions/step_steps.rb:11

1 scenario (1 passed)
3 steps (3 passed)
0m0.002s

==看上去是不是有点奇怪，这个就是结果。

cucumber

Cucumber 是一个能够理解用普通语言 描述的测试用例的支持行为驱动开发（BDD）的自动化测试工具，用Ruby编写，支持Java和.Net等多种开发语言。

如官网所说,Making BDD fun，确实有点意思。

官网给出的七个步骤

• Describe behaviour in plain text
• Write a step definition in Ruby
• Run and watch it fail
• Write code to make the step pass
• Run again and see the step pass
• Repeat 2-5 until green like a cuke
• Repeat 1-6 until the money runs out

使用cucumber

那么，就我们开始这个有趣的过程吧。

安装

 gem install cucumber

省去一些废话，这里就只用这些来表达。

使用cucumber

最后项目结果如下所示

└── features
    ├── basic.feature
    └── setp_definitions
        └── step_steps.rb

下面是basic.feature的最后结果：

Feature: Hello World Feature
  In order to ensure that my installation works
  As a Developer
  I want to run a quick Cucumber test

  Scenario: Hello World Scenario
    Given The Action is Hello
    When The Subject is World
    Then The Greeting is Hello, World

看上去和我们的运行结果有点相似，我们看看step_steps.rb

require 'rspec/expectations'

Given /The Action is ([A-z]*)/ do |action|
  @action = action
end

When /The Subject is ([A-z]*)/ do |subject|
  @subject = subject
end

Then /The Greeting is (.*)/ do |greeting|
  greeting.should == "#{@action}, #{@subject}"
end

似乎这个看不出什么结果，等等，我们修改一下basic.features。

于是我们很愉快的将，Hello改为Hello1

[WARNING] MultiJson is using the default adapter (ok_json).We recommend loading a different JSON library to improve performance.
Feature: Hello World Feature
  In order to ensure that my installation works
  As a Developer
  I want to run a quick Cucumber test

  Scenario: Hello World Scenario       # features/basic.feature:6
    Given The Action is Hello          # features/step_definitions/step_steps.rb:3
    When The Subject is World          # features/step_definitions/step_steps.rb:7
    Then The Greeting is Hello1, World # features/step_definitions/step_steps.rb:11
      expected: "Hello, World"
           got: "Hello1, World" (using ==) (RSpec::Expectations::ExpectationNotMetError)
      ./features/step_definitions/step_steps.rb:12:in `/The Greeting is (.*)/'
      features/basic.feature:9:in `Then The Greeting is Hello1, World'

Failing Scenarios:
cucumber features/basic.feature:6 # Scenario: Hello World Scenario

1 scenario (1 failed)
3 steps (1 failed, 2 passed)
0m0.002s

这个就是我们需要的过程，红->绿，不过这里把这反了过来。