I'm doing RSpec controller testing with CanCan authorization, and I'm
seeing something I've never seen in RSpec before: the same test run
twice fails on the second one.  I am NOT doing before(:all) or other
things that should cause state to persist between tests:

Here's the relevant code:

  context "POST create" do

    context "with user logged in" do
      before(:each) do
        @user = mock_model(User, :admin? => false, :guest? => false)
        controller.stub(:current_user) { @user } # aka login
        @attributes = valid_attributes
      end

      # succeeds
      it "should create a new Premise" do
        lambda{
          post(:create, {:premise => @attributes}, :format => :json)
        }.should change(Premise, :count).by(1)
      end

      # fails with CanCan::AccessDenied
      it "should create a new Premise again" do
        lambda{
          post(:create, {:premise => @attributes}, :format => :json)
        }.should change(Premise, :count).by(1)
      end

  end

I can't figure out why the first test passes and the second test fails
-- this suggests that there's some state that's being preserved across
the tests, but I can't imagine what that might be, nor how to check for
it.

Any suggestions?  (Of course, I can provide full model and Ability class
info if it would be helpful.)  TIA.

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