Keeping little hands off

Press lock.
The child lock is on.
Set the dial to 100 %.
The kettle is off.
Set the dial to 0 %. Then press lock.
The child lock is off.
Set the dial to 80 %.
The kettle is heating.

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How this is tested passed

This tutorial is also an acceptance test. Its report has every step, check and screenshot from the last run.

The user story: As a parent, I want the child lock to keep the kettle off, so that a curious toddler turning the dial doesn't start it.

When the user presses lock
Then the child lock is on
When the dial is 100 %
Then the kettle is off
When the dial is 0 %
  And the user presses lock
Then the child lock is off
When the dial is 80 %
Then the kettle is heating