module Shoulda::ActionController::Macros

should_assign_to(:user) { @user }
should_assign_to :user, :class => User
should_assign_to :user, :posts

Example:

the return value of that block.
If a block is passed, the assigned variable is expected to be equal to

* :class - The expected class of the instance variable being checked.
Options:

each of the named instance variable(s).
Macro that creates a test asserting that the controller assigned to

def should_assign_to(*names, &block)
  klass = get_options!(names, :class)
  names.each do |name|
    matcher = assign_to(name).with_kind_of(klass)
    should matcher.description do
      if block
        expected_value = instance_eval(&block)
        matcher = matcher.with(expected_value)
      end
      assert_accepts matcher, @controller
    end
  end
end