问题
The following generates an error: "undefined local variable or method `params'"
assert_equal params[:recipient_id], users(:one).id
How do you test the params hash?
Also, how do you test assert_redirect when there are params present? The params are appended to the URL, so testing for model_path or similar fails.
Working with built in test class in Rails 3.
回答1:
http://guides.rubyonrails.org/testing.html#functional-tests-for-your-controllers gives some of this information.
In this case, params is attached to the @request or @response object (depending on what HTTP method you are testing), so you can refer to it as @request.params[:recipient_id].
For redirect:
assert_redirected_to post_path(assigns(:post)) will assert that you are redirected to the proper path for a given model. The assigns method should have the instance variables you are setting inside of the controller to pass to the view
来源：https://stackoverflow.com/questions/6628021/how-do-you-test-the-params-hash-in-a-rails-test