What argument should I pass for mock(), stub() and double()

Testing RSpec
1

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
2

John,

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

  • Lee
3

On Oct 11, 2009, at 6:21 AM, Lee H. wrote:

John,

I may well be wrong, but I believe it’s just a tag or name, so
when you print out - 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:

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.