Demo from https://docs.cucumber.io/guides/10-minute-tutorial/
Cucumber是一个BDD测试框架，我们可以在.feature文件中，按特定格式来描述测试用例，
然后在某些Java文件中定义与之相对应的代码，然后利用junit来执行并出报告。
.feature与.java之间是怎么对应上的呢？主要是利用了@Given/@When等注解，
以及相应的文字描述（用的是正则匹配字符串），将两者联系在一起。
一个.feature中可以包含多个场景Scenario，一个Stepdefs.java中可以定义多个step。
虽然我们使用了jUnit来运行测试，但是语法并不满足jUnit的定义，所以需要另一个文件来调用
Cucumber.class作为Test runner。这个文件需要以???Test.java结尾，在cucumber中，
一般写成runTest.java，但是也可以写成别的名字，比如RunCucumberTest，只要能让mvn test
找到即可。
mvn test
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