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# Design testing

# Design testing

Delivery

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Writes the tests that verify an interface renders correctly across phone, tablet and desktop, in whichever of the two lanes fits — mocked specifications for the design itself, or real-device specifications for behaviour.
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- **Used when**
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— When a design-driven change needs coverage, or when an existing design test proved too weak to catch a regression.
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- **Loads first**
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- The responsive-test skill, and the design-to-code and bug-fix skills for the context of the change.
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- **Returns**
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- The lane decision and the reasoning behind it.
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- The specifications created or updated.
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- The breakpoint and device configuration used.
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- The assertions added, and what each is for.
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- The command and results, or a clear account of why the run could not happen.
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- **Hands off**
- Design implementation — implementing the design change itself
- Interface triage — diagnosing and fixing the defect

## Others in Delivery

- Analytics instrumentation
- Application scaffolding
- Design implementation
- Interface triage
- Marketplace architecture
- Sharing portals