I'm missing this particular feature in T::U that I have in RSpec -- nested contexts + lets/subjects blocks.

    context "parent" do
      subject { Factory(:something, :value => other_thing) }
      let(:other_thing) { "Value" }
      it "has 'Value' value" do
        subject.value.should == "Value"
      end

      context "nested" do
        let(:other_thing) { "Totally other value" }
        it "has 'Totally other value' value" do
          subject.value.should == 'Totally other value'
        end
      end
    end