TesterArmy (YC P26)

Agentic testing platform for web and mobile apps. Test your app with AI agents.

Creators of e2e. Backed by @ycombinator.

[TesterArmy (YC P26) @TesterArmy]

e2e just passed 10,000 GitHub stars, and @kacperkapusciak is going live to show how to use it.

From npx e2e init to results on every pull request and run one test on web, iOS and Android. Then it's open Q&A.

Thu, Oct 22 · 9 AM PT · 12 PM ET · 6 PM CEST

Save a seat:
https://t.co/58XSMXpdli

[Kacper Kapuściak @kacperkapusciak]

You can now iterate faster while writing e2e tests

Agents (and humans!) can use `--watch` to rerun only the e2e tests that changed

~/ npx e2e run --watch

[Oskar @o_kwasniewski]

Introducing Test Filters API in e2e ✨

→ Run only tests that your PR affects
→ Use decision models like Jev to decide which tests to run
→ Write custom filters

Available now: ~/ npx e2e init

[Kacper Kapuściak @kacperkapusciak]

Yesterday I had a livestream session covering intro to e2e.

Missed it? Here's the recording 👇

[TesterArmy (YC P26) @TesterArmy]

Intro to e2e: agentic end-to-end testing, live https://t.co/PsUDwI9tCK

[Kacper Kapuściak @kacperkapusciak]

Going live tomorrow to show how I use e2e day to day

We'll go through the setup, replaying verified agent steps without the model, and running it on GitHub Actions CI

Then open Q&A, so bring your questions!

📅 Thu, Oct 22 · 9 AM PT / 6 PM CEST https://t.co/21NDSDIMrt

[TesterArmy (YC P26) @TesterArmy]

https://t.co/PsUDwI8VNc

[Kacper Kapuściak @kacperkapusciak]

Payments are notoriously difficult to end-to-end test

iframes inside of iframes, iframe for every field… hell on earth for developers

but not for agents! define e2e tests in plain english and agents take care of the rest

~/ npx e2e init

[Kacper Kapuściak @kacperkapusciak]

One of the most powerful features of agentic e2e are *personas*

Your agent larps as an architect in Lyon who only speaks French or pharmacist in Cairo who only reads Arabic

Great for catching missing i18n or broken RTL and you still write tests in English

[Oskar @o_kwasniewski]

e2e 0.21.2 is out ✨

- @lightpanda_io support for faster test execution
- @testmuai device provider package
- Performance & reliability improvements

try it now: ~/ npx e2e init

[Kacper Kapuściak @kacperkapusciak]

In e2e, you can use one model to run `agent.act`s, and a different one to answer `agent.assert`ions

That way you can use faster model for navigating your app and smarter model for checking if the app actually works according to your spec

[TesterArmy (YC P26) @TesterArmy]

@Tesla how the hell do we end-to-end test THAT

[TesterArmy (YC P26) @TesterArmy]

@kencytbb @kacperkapusciak yes the live will be recorded!

[TesterArmy (YC P26) @TesterArmy]

e2e just passed 10,000 GitHub stars, and @kacperkapusciak is going live to show how to use it.

From npx e2e init to results on every pull request and run one test on web, iOS and Android. Then it's open Q&A.

Thu, Oct 22 · 9 AM PT · 12 PM ET · 6 PM CEST

Save a seat:
https://t.co/58XSMXpdli

[TesterArmy (YC P26) @TesterArmy]

@expo_devlog @expo You finally recovered @expo_devlog's password! Welcome back!

[Kacper Kapuściak @kacperkapusciak]

How to get started with e2e by @TesterArmy just in 4 minutes

Bookmark it so you can watch it later

[Kacper Kapuściak @kacperkapusciak]

Introducing /migrate-to-e2e

Allow your agent to migrate your existing end-to-end test suite to agentic e2e one slice at a time.

~/ npx skills add tester-army/e2e --skill migrate-to-e2e

[Oskar @o_kwasniewski]

we're expanding our open-source team to work on e2e full-time.

if you think verification of agents' work is one of the most important problems to solve right now, join us!

reply or dm me

[Agent Conf | Sept 17-18, 2026 | Warsaw @AgentConf]

Who's testing the code your agents write? @SzymonRybczak of @TesterArmy explains AI testing for web and mobile apps, including test plans built around each pull request.

[Oskar @o_kwasniewski]

e2e has just hit 10k GitHub stars! 🚀

https://t.co/kN9tLqm4zI

[TesterArmy (YC P26) @TesterArmy]

Our agentic testing framework, e2e, on iOS and Android is powered by @agent_device.

We teamed up with @callstackio to explain how it all works under the hood.

[Callstack Engineers @callstackio]

e2e by @TesterArmy runs mobile tests through our open-source @agent_device. Combine goal-based agent actions with exact assertions, then replay cached actions without inference on cache hits.

Read how it works on iOS and Android 📖 https://t.co/WxUJKyQpt1