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sanderling/examples/sample-app/README.md
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pj d0578dbaaa fix(runner): warn on malformed screen snapshot (#13)
* fix(runner): warn on malformed screen snapshot

screenFromSnapshot swallowed json.Unmarshal errors, so a non-string
screen value silently became "" in the step log and trace while the
verifier still saw the raw JSON. Return the error and warn at the
call site, matching the hierarchy warning pattern.

* docs: clarify --avd is optional for uatu test

The CLI accepts --avd as an empty-string default (cmd/uatu/main.go:49)
and only requires it when no device is connected and multiple AVDs
exist (cmd/uatu/android_env.go:63). Docs and examples that showed it
as required or always-passed were misleading.
2026-04-18 17:14:31 +07:00

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Markdown

# uatu sample app
Tiny Android app wired to the uatu SDK, plus a TypeScript spec that drives it.
Use it as a reference for integrating uatu into your own app.
## Prerequisites
- `uatu` CLI on `PATH` (see [getting started](https://priyanshujain.github.io/uatu/manual/getting-started.html))
- Android SDK installed (uatu auto-discovers `adb` and `emulator` under
`$ANDROID_HOME`, `~/Library/Android/sdk`, or the Homebrew cask; nothing to
export if you use a standard install)
- `just` task runner
## Install the app
```sh
just install
```
## Run a test
```sh
just test
```
If no device is connected, uatu boots the single AVD it finds. With multiple
AVDs, pick one:
```sh
just AVD=Pixel_7 test
```
Persistent settings can live in `.env` alongside the justfile:
```
AVD=Pixel_7
DURATION=5m
```
Traces land in `./runs/<timestamp>/`.
## How the pieces connect
- `android/build.gradle.kts` depends on `io.github.priyanshujain:sdk-android` from
Maven Central
- `android/src/main/kotlin/.../SampleApplication.kt` calls `Uatu.start(this)` and
registers snapshot extractors (`app_state`, `click_count`)
- `spec.ts` imports `@uatu/spec` (see `package.json`), reads those snapshots,
asserts properties on them, and weights the actions the fuzzer picks from
- `just test` invokes `uatu test` against the installed APK on the connected device (or the AVD named via `AVD=`)