Double an instance of a Ruby class -

I'm using Ruby on Rail Some hardware available on my development I do not want

using Rails.env want a class "double" so that "real implementation" Double square XY iff Rails.env ==: Production ).

I have tried rspec-mocks double , but it requires throws expectations and exceptions.

Finally I used the following code:

  class double The DRF method_mission puts (M, * algies, and blocks) "# {m} was called with logic: # {args.join (',')}" end and  

Of course, it does not work for those methods, which have been declared on objects , but it was sufficient for my needs, apart from this, it does not give the ability to pass in the parameter.

In addition to this, I wrote a little helpful function to instantiate objects based on class constants. Since there were a few singletons in my code, I also implemented a check for this, so that the actual class is reversed only when the railway environment is 'produced'.

  def example_f (c) if Rails.env == 'output' if c.ancestors.include? Singleton c.instance else c.new end second double. New End End  

Example Usage: SOME_CONST = Module XY :: ClassZ .