Keeping little hands off
Tap LOCK.
The LOCK badge lights up.

Drag the DIAL slider to 100 %.
The display reads OFF.

Drag the DIAL slider to 0 %. Then tap LOCK.
The LOCK badge goes dark.

Drag the DIAL slider to 80 %.
The display reads HEATING and the light turns red.

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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