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sanderling/pkg/spec-api/README.md
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Markdown

# @uatu/spec
TypeScript spec API for [uatu](https://github.com/priyanshujain/uatu), a property-based UI fuzzer for mobile apps.
Spec authors write specs in TypeScript that describe what an app should *always* do (safety invariants), generate weighted actions to exercise the app, and extract structured state from the accessibility tree. The `uatu` CLI picks up the spec and drives the app under test.
## Install
```sh
npm install --save-dev @uatu/spec
```
## Usage
```ts
import { extract, always, actions, Tap, weighted } from "@uatu/spec";
export const spec = {
extract: extract((tree) => ({
onHomeScreen: tree.some((n) => n.text === "Home"),
})),
always: always(({ state }) => state.onHomeScreen || !state.startedOnHome),
actions: actions(({ tree }) =>
weighted([
[1, Tap(tree.first((n) => n.text === "Checkout"))],
]),
),
};
```
## Version compatibility
`@uatu/spec` is released in lockstep with the uatu CLI. Pin the same major/minor version as your installed `uatu` binary.
## License
Apache-2.0