how not to loop/nest rspec example groups (where you want to iterate diferent let/before variable values)

tests_spec.rb

class Tests
  SUBTESTS = %w(Abstract Decision Quantitative Verbal)
end

describe Tests do

  describe "before assigning @ - " do
    describe "this doesn't work because the loops are all at the same describe level (the befores override one another)" do
      Tests::SUBTESTS.each do |test|
        before(:each) do
          @test = test
        end

        specify test do
          @test.should == test
        end
      end
    end

    describe "this does work because there's an inner describe block isolating the examples" do
      Tests::SUBTESTS.each do |test|
        describe "#{test} in a block" do
          before(:each) do
            @test = test
          end

          specify test do
            @test.should == test
          end
        end
      end
    end
  end

  describe "lazy-let blocks" do
    Tests::SUBTESTS.each do |test|
      describe "#{test} in a block" do
        let(:thetest) {test}

        specify test do
          thetest.should == test
        end
      end
    end

    describe "lazy-let blocks" do
      Tests::SUBTESTS.each do |test|
        let(:thetest) {test}

        specify test do
          thetest.should == test
        end
      end
    end
  end
end

6 of the specs should fail