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Plain-English end-to-end tests for Android and iOS apps, driven by TypeSafe's Jev. Deterministic, strict, CI-ready.
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Jevtest — just-betr
Plain-English end-to-end tests for Android and iOS apps, driven by Jev: write what a user does and what they should see, and Jev works out the taps. Every decision is recorded in a lockfile so CI replays runs exactly with --lock frozen.
- Stars
- 3
- Language
- Python
- License
- MIT
- Reading time
- 2 min
- Published by
- Community
- Author
- just-betr
- Last verified
- Oct 2026
This is one of several Jev listings for the same project. The canonical entry is Jevtest — joshhu.
Used inJev for Software & DevTools
Highlights
- Tests are YAML: a `do:` plain-English goal plus `expect:` and `see:` assertions, with tap:, type:, swipe:, scroll_to: and 22 more steps for exact control.
- Every Jev decision is recorded in a lockfile; `--lock frozen` replays a run exactly with no network and no API key.
- Drives Android emulators and phones and iOS simulators and iPhones: native, Flutter, React Native and in-app WebViews, with device state restored.
- `jevtest inspect` saves each screen with every element boxed, the names steps can use, and a JSON dump for agents writing tests.
- CI features: ${SECRETS} from .env, shared test libraries, whole folders per command, several devices at once, JUnit XML, JSON reports and failure screenshots.
Quickstart
bash
pip install jevtest
jevtest run login.yaml --lock frozen --out resultsWatch out
Grounded on the truncated README and GitHub metadata reviewed 2026-10-15; the install section cuts off at the Android SDK note. The example console output shows jevtest 0.10.0 and one frozen run, and the README publishes no accuracy claims for Jev's taps.
Questions about this entry
Short answers drawn from the linked project or page.
An end-to-end testing tool for Android and iOS apps where tests are written in plain English: you describe what a user does and what should be visible, and Jev decides which taps and inputs to make.
Jev resolves each plain-English goal into concrete steps, which are recorded in a lockfile. The README's console example shows one decision served from the lockfile at $0.0000, so the model mainly runs when generating new steps.
No for frozen replays: `--lock frozen` uses the lockfile with no network and no API key. Asking Jev live for new decisions needs TypeSafe access.
Android emulators and phones, and iOS simulators and iPhones, covering native apps, Flutter, React Native and in-app WebViews, all driven the same way.
Run `pip install jevtest`. You also need the platform tools for your apps, such as the Android SDK and a JDK, per the README's install section.
It starts the app and saves each screen with every element boxed on the screenshot, the names steps can use, and a JSON dump for agents that write tests.
It is the Just-Betr project under MIT, published on PyPI with docs at just-betr.github.io/jevtest. The example run shows version 0.10.0; the README portion reviewed is truncated.
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