Using Rspec's "let" inside an "it" block. Crazy? Yes. Useful? Occasionally.

some_spec.rb

  describe "#mentions_story?" do
    subject { described_class.new(file) }
    let(:file) { "COMMIT_EDITMSG" }
    before do
      File.stub(:read).with(file) { example_commit_message(@relevant_part) }
    end

    context "commit message contains the special Pivotal Tracker story syntax" do
      it "matches just the number" do
        @relevant_part = "[#8675309]"
        subject.should be_mentions_story("8675309")
      end

      it "matches state change and number" do
        @relevant_part = "[Fixes #8675309]"
        subject.should be_mentions_story("8675309")
      end
    end

    context "commit message doesn't contain the special Pivotal Tracker story syntax" do
      it "doesn't match without brackets" do
        @relevant_part = "#8675309"
        subject.should_not be_mentions_story("8675309")
      end
    end
  end

Yeah, that's what I ended up doing, but didn't like it. And to be honest, I'm not sure why... aesthetics I suppose.

What would be the best way to achieve something similar?
Thanks