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# Feature Layer
The feature layer defines the **what** of a feature’s tests.
## Key Types
```kotlin
enum class FeatureKey { PRIVATE_BROWSING /* ... */ }
data class FeatureSpec(
val key: FeatureKey,
val preconditions: List<TestStep> = emptyList(),
val surfaces: List<SurfaceCheck> = emptyList(),
val interactions: List<InteractionCheck> = emptyList(),
val sanity: List<BehaviorCheck> = emptyList(),
val cleanup: List<TestStep> = emptyList(),
)
```
Use the DSL or data to build `FeatureSpec`; factories do the rest.