I'm using asserts_redirected_to in my unit tests, and I'm receiving this warning:

DEPRECATION WARNING: Using assert_redirected_to with partial hash arguments is deprecated. Specify the full set arguments instead.

What is a partial hash argument, and what is a full set argument? These aren't terms that I've seen used in the Rails community before, and the only relevant results I can find on Google for these are in reference to this deprecation warning.

Here is my code:

 assert_redirected_to :controller => :user, :action => :search

also tried:

 assert_redirected_to({:controller => :user, :action => :search})

I might have guessed that it feels I'm missing some parameters or something like that, but the API documentation explicitly says that not all parameters need to be included:
http://rails.rubyonrails.org/classes/ActionController/Assertions/ResponseAssertions.html