示例功能文件

示例功能文件：

功能 ：计算器

   In order to avoid silly mistakes
   As a math idiot
   I want to be told the sum of two numbers

@mytag

场景 ：添加两个数字

   Given I have entered 50 into the calculator
   And I have also entered 70 into the calculator
   When I press add
   Then the result should be 120 on the screen