anchor.diff:  ----
   
   A stage class contains multiple step methods that can be called in a scenario and that will appear in the report.
  -Step methods are the heart of JsGiven. The test initialization, execution and assertions **must** be implemented in step methods.
  +Step methods are the heart of JsGiven. The test initialization, execution and assertions **must** be implemented within step methods.
   
   Every non-static method of a stage class that returns the stage instance (**this**) can be used as a step method.
   
  
positive.code: ====
  
  There are no further requirements.
  In particular, no annotations are needed.
  
  [NOTE]
  .In addition, a step method should be written in snake_case
  
negative.code: 
  ----
  $ yarn add -D js-given <1>
  $ npm install --save-dev js-given<2>
  ----
  <1> With https://yarnpkg.com[Yarn]
  <2> With https://www.npmjs.com/[NPM]
  