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In case you can’t upgrade to Jasmine 2.0.0 for your project (possibly because it hasn’t been released yet), it’s still possible to use 1.3.1 with Rails 4 through jasmine-gem.
All you have to do is point your jasmine gem dependency at tag 1.3.1-rails-4-support. Your Gemfile should include the following:
gem 'jasmine', github: 'pivotal/jasmine-gem', tag: '1.3.1-rails-4-support'