>The other kind of test is what I call a "storybook test." Table tests are less useful here

Storybook tests lend themselves well to forked tests. E.g.

  steps:
  ...
  - click: shopping basket

  variations:
    Empty basket:
      following steps:
      - click: empty basket
      - items in basket: 0

    Purchase basket:
      following steps:
      - click: purchase
      ...