rspec users - Oct 2009 - What argument should I pass for mock(), stub() and double()

Hi - I''m reading the RSpec book.

I see an example like:

  customer = double(''customer'')


What is the customer that is in the argument for?
How is this different from:

  customer = double()

? Can anybody explain to me?

- Jon

John,

I may well be wrong, but I believe it''s just a `tag` or name, so when
you
print out <customer> - you see <#Double customer> rather tahn
something
inexplicable, that is at least how it appears to work using Mocha

- Lee
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On Oct 11, 2009, at 6:21 AM, Lee Hambley wrote:
> John,
>
> I may well be wrong, but I believe it''s just a `tag` or name, so  
> when you print out <customer> - you see <#Double customer>
rather
> tahn something inexplicable, that is at least how it appears to work  
> using Mocha
Not so much when _you_ print it out, but when there is a failure and  
rspec prints out a failure message for you. This is actually explained  
in the book - on page 207 if you''ve got beta 10:

<snip>
To create a double, just use the double( ) method, like this:

thingamajig_double = double(''thing-a-ma-jig'')

The string argument is optional, but highly recommended as it is used  
in failure messages.
</snip>
> - Lee
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