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Improved assert_difference

#5402

Documentation says:

Test numeric difference between the return value of an expression as a result of what is evaluated in the yielded block.

It'd be very handy if the method can assert difference in arrays as well:

user = User.new
assert_difference("user.notifications", ["Welcome to the webpage!"]) { user.save! }

.. or strings:

path = "/home/user"
assert_difference("path", "/projects") { path << "/projects" }

But there's a little problem: assert_difference stores a reference to the object instead of a clone. It can't see the difference when the referenced object has been modified in the block.

Reported by Jakub Kuźma · August 18th, 2010 @ 03:10 PM

Activity

Santiago Pastorino
- State changed from new to open
This issue has been automatically marked as stale because it has not been commented on for at least three months.

The resources of the Rails core team are limited, and so we are asking for your help. If you can still reproduce this error on the 3-0-stable branch or on master, please reply with all of the information you have about it and add "[state:open]" to your comment. This will reopen the ticket for review. Likewise, if you feel that this is a very important feature for Rails to include, please reply with your explanation so we can consider it.

Thank you for all your contributions, and we hope you will understand this step to focus our efforts where they are most helpful.

February 2nd, 2011 @ 05:00 PM
Santiago Pastorino
- State changed from open to stale
February 2nd, 2011 @ 05:00 PM