Mocha doesn’t play nice with Rails 3 & Bundler
Using mocha with edge beta Rails 3, I added Mocha to the Gemfile
gem "mocha"
All was going swimmingly until I ran into a problem. I reduced it to:
The result of running this test was:
#test_mock_doesnt_fail should fail, but doesn’t. Changing the require lines at the top of the file to not load Rails and only load Mocha (+Rubygems+Test::Unit):
require "rubygems"
require "test/unit"
require "mocha"
caused the test to fail as expected. After an hour or two digging around, I stumbled across a post on the Mocha mailing-list that mentioned ordering problems with Mocha and Test::Unit. Sure enough, if I rearranged the modified require lines so that Test::Unit was loaded after Mocha:
require "rubygems"
require "mocha"
require "test/unit"
the test would break — I.e. wouldn’t fail.
Following the advice in the post — modified for bundler — I changed my Gemfile to read:
gem 'mocha', :require => nil
and added:
require "mocha"
to test/test_helper.rb to make sure Mocha was loaded. This isn’t strictly needed, but it’s good to be clear.
Final result, the test fails as expected, and Mocha is seems to be working properly.
