gist: 7991


  
    
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              #Throw this in spec helper
def block_should(matcher, &block)
  block.should matcher
end
 
def block_should_not(matcher, &block)
  block.should_not matcher
end
 
#Use it like this
block_should change(Thing, :count).by(-1) do
 @thing.destroy
end
 
#Which is just a little cleaner version of this
lambda do
  @thing.destroy
end.should change(Thing, :count).by(1)