Summary

• Define the acceptance tests at a high level as soon as you read/see a story.

• Write down the obvious things that come to mind.

• If you get stuck, try this:

  • Write two tests for each action in the story, including descriptions of the inputs and system outputs:

    - One that makes the action succeed

    - One that makes it fail

• When you've identified hidden assumptions, write them into the acceptance-test definitions.

• Concentrate on what, not how, and don't sweat the details.

The following exercise gives you a chance to try this out for yourself.