ruby on rails - Rspec describe method syntax -

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i don't find syntax of rspec describe method, find examples. if correctly understand, can pass describe method string, class name (model name, example), , string , class name parameters. difference between these 3 cases of invocation describe?

describe 'string' ... end  describe modelname ... end  describe 'string', modelname ... end

it depends on thing want describe.

that description , other developers working code base.

$ rspec --format=documentation spec/

or just

$ rspec -fd spec/

will out 

string   ... modelname   ... string modelname   ...

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