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Delete all your E2E tests, seriously Okay, not the coverage, the code I’ve written Playwright tests, they’re great Maintaining hundreds of browser scripts while the UI keeps changing is not so much Honestly, AI feels more naturally suited to this than half the coding use cases we keep forcing... it into When I first used TesterArmy on Angular Space, I assumed it was mainly for smaller teams that had never built a proper Playwright suite Then I saw its Playwright migration, and I think I had it backwards It may be even more useful when you already have far too much Playwright to maintain The journey stays in plain English: “Log in, publish an article and make sure it appears.” An agent runs it in a real browser No selectors to babysit, no test code to maintain And for mobile apps, it can test directly from the binary! Don’t delete your E2Es today First migrate 10 real journeys, run both, and decide which one you want to maintain six months from now Docs url in comments 👇show more

Daniel Glejzner

7,387 subscribers

90,340 views • 1 month ago •via X (Twitter)

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23 Comments

Éverton Toffanetto1 month ago

Tests are written as scripts because they need to be deterministic. Using AI introduces a variable you don’t fully control. I see them as complementary approaches, not as one replacing the other.

Daniel Glejzner1 month ago

The control part is the part that you need to weight, since full control comes with a cost as well. If you don't want to pay by hour for developers to maintain tests but want to have a regression testing path. It's an easy way to get it done without even thinking much about it :)

Kevin Möchel1 month ago

Have the AI write playwright tests Run them on a schedule If failed, have an agent fix them Run tests for free instead of a paid sub

Daniel Glejzner1 month ago

You could do that but it's still not free, takes your time, validation and you have to physically be responsible for them It's a decision between your own time or just having it handled by a third party where all you maintain are written user stories

AI Apps API1 month ago

The maintenance cost is real and it comes from the same place every time, selectors encode layout instead of intent. A test that says click the button labeled Save survives a redesign, one pinned to a generated class name does not. Agents help most when the step is described that way, and the flaky part left over is usually waiting, asserting on state that has actually settled rather than a fixed timeout.

Paweł Kubiak 🅰️1 month ago

Ok, but what about costs? I assume that TesterArmy agent can interact with website by sending screenshot/html/a11y tree to LLM to identify crucial elements to interact with. If so, then it is expensive in terms of costs. In that case I would keep e2e tests.

Daniel Glejzner1 month ago

From what I understand from docs it's mostly based on visuals and it charges you per run with a monthly subscription With regular E2E it all depends how much maintenance you have around them. If you have an app that doesn't change that much, you don't feel the pain. In fast paced env tools like TesterArmy remove the burden of updating tests and adding new is super simple Gonna dig around how actual internals work other than screenshots :)

Daniel Glejzner1 month ago

I actually found out they’re not relying on vision by default. They use accessibility APIs first (DOM on the web, native APIs on mobile), and only fall back to vision when needed since it’s much slower and more expensive However you are paying per run so they need to care about the tokens not you :)

AI Alpha By Mario1 month ago

The maintenance burden is the real killer — AI handling intent while the UI changes underneath feels like the right split

Daniel Glejzner1 month ago

So far I had a really good and consistent results :)

AI Mastery Guide1 month ago

Plain English tests instead of babysitting selectors sounds so much easier.

Daniel Glejzner1 month ago

Indeed! it's much more convenient not to think about all the selectors and code around them when you don't have to :)

AI Mastery Guide1 month ago

Less brittle scripts, more time actually shipping features.

Pavan K Jadda1 month ago

Looks interesting

Daniel Glejzner1 month ago

Give it a try :)

Shahar Nechmad1 month ago

Agree. Maintaining selectors is probably one of the worst parts of E2E tests. These days, agents are smart enough, and computer use has become so much better. Check out also what Cloudflare is doing. They released a lot of infra in the past two weeks, to build this at scale.

incpo1 month ago

at leats playwright is free

Daniel Glejzner1 month ago

yes it is, but your time is not :) Gotta decide what is worth more

Vivek Nayyar1 month ago

The issue is the latency and cost plus unpredictability. Will the model always find the right button to click and test 😅

Daniel Glejzner1 month ago

Give it a try :) it comes with a free trial, cost is per run - pretty convenient as well. In my experience it does a pretty damn good job at clicking the right things. Not sure about the latency? What's the issue there?

Vivek Nayyar1 month ago

Take screenshot, call llm to find the right element and then simulate click - this would have higher latency than a data test id click

fudes1 month ago

Quoting a VC as an authority on building is like quoting a food critic as an authority on cooking.

Mitchell Agoma1 month ago

Deleting brittle scripts while preserving meaningful coverage is the right distinction. AI can reduce maintenance, but teams still need deterministic checks and ownership of release risk. Related QA view:

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17,042 views • 7 months ago

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15,893 views • 15 days ago

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Md Riyazuddin

43,480 views • 1 month ago

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Ian Carroll

76,033 views • 2 years ago

Ever since I wired Claude Code to WhatsApp 3 weeks ago, I built a stupidly large infra around it. I mean, opus built it. No clue how the code even looks. The entire thing was vibe coded using my phone. I wanted to see how far I could push it without touching the computer. Everything via WhatsApp. Build what I need on the fly. So the resulting infrastructure will already be battle tested for software development. The entire thing was streamlined with nearly no manual interventions, everything was communicated via WhatsApp using a single script establishing this connection. If the script is down, I need to get home to start it again to resume the development. Claude was upgrading it, debugging it, restarting it while maintaining constant uptime so it could keep communicating with me. I stressed Claude about it, telling it that it will be “in the dark” and other words that deliberately sound scary about losing communications if the script dies. I also refused git and refused cloning the code, I wanted to see Claude adapting to work on a *LIVING* system. The way this whole thing works: Claude has its own dedicated phone number that I am paying for. A real WhatsApp account for it is installed on a real iPhone that is sitting on my desk. All is registered under my name, this is legit setup with no hacks and tricks. I’ve set up a WhatsApp “Community” and multiple different groups under it. Both me and Claude are the admins, so Claude could edit it on my behalf. Each group is a project I am working on and has its own isolated context. The Group description is a system prompt that gets auto-appended to the larger system prompt explaining this setup in general. When I send a message it’s an instant interrupt to Claude Code’s process, just like in the terminal. Voice notes are seamlessly transcribed with a local Whisper model. Images are used with multimodal reading in an isolated parallel session. Multiple groups running in parallel so I can work on all projects at the same time. No cross-talking, everything has an isolated context and history. And because it’s local on my own machine: Everything is REAL. The browser is REAL. I am connected as myself on it to all services because I actually use it in real life. Claude has unlimited internet access, just like humans who use actual browsers. It utilizes custom-made browser tools that I made to control any browser session it wants. Depending on the situation, it can either connect to my existing session or create one for its own. (You can tell it ‘look at my browser for a sec’ then talk about the current page you are on and it just works, pretty cool) My custom browser tools are not perfect (not by a long shot) but I managed to make them work well to the point they are somewhat reliable. This gives Claude full access to my real creds and all the services I actually use. I’m productive AS HELL with this. It really feels like a personal assistant. I ask it to read my emails and msgs, check x .com for news, research arxiv papers, write code, run experiments for me, investigate and reverse engineer github repos, even use my credit card and order things. [I try not to do this one a lot lol so far no disasters]. All from my phone. Super convenient. This is not a product or an open source project (maybe soon of it will make sense). This is just an ugly script I hacked the entire thing is ~600 lines. (ok maybe i did look at the code, but i swear i didn’t edit!) You can also vibe code this from scratch pretty fast and it will probably even end up better. This is just a cool thing so I’m sharing. It is a real speed booster for many things I do on daily basis, mostly boring things. Forcing my routine into some new “agent platform” just didn’t feel right for me. WhatsApp is where I already communicate and look for messages, so I decided that my agents will live there too. AGI in my pocket 24/7.

Ever since I wired Claude Code to WhatsApp 3 weeks ago, I built a stupidly large infra around it. I mean, opus built it. No clue how the code even looks. The entire thing was vibe coded using my phone. I wanted to see how far I could push it without touching the computer. Everything via WhatsApp. Build what I need on the fly. So the resulting infrastructure will already be battle tested for software development. The entire thing was streamlined with nearly no manual interventions, everything was communicated via WhatsApp using a single script establishing this connection. If the script is down, I need to get home to start it again to resume the development. Claude was upgrading it, debugging it, restarting it while maintaining constant uptime so it could keep communicating with me. I stressed Claude about it, telling it that it will be “in the dark” and other words that deliberately sound scary about losing communications if the script dies. I also refused git and refused cloning the code, I wanted to see Claude adapting to work on a LIVING system. The way this whole thing works: Claude has its own dedicated phone number that I am paying for. A real WhatsApp account for it is installed on a real iPhone that is sitting on my desk. All is registered under my name, this is legit setup with no hacks and tricks. I’ve set up a WhatsApp “Community” and multiple different groups under it. Both me and Claude are the admins, so Claude could edit it on my behalf. Each group is a project I am working on and has its own isolated context. The Group description is a system prompt that gets auto-appended to the larger system prompt explaining this setup in general. When I send a message it’s an instant interrupt to Claude Code’s process, just like in the terminal. Voice notes are seamlessly transcribed with a local Whisper model. Images are used with multimodal reading in an isolated parallel session. Multiple groups running in parallel so I can work on all projects at the same time. No cross-talking, everything has an isolated context and history. And because it’s local on my own machine: Everything is REAL. The browser is REAL. I am connected as myself on it to all services because I actually use it in real life. Claude has unlimited internet access, just like humans who use actual browsers. It utilizes custom-made browser tools that I made to control any browser session it wants. Depending on the situation, it can either connect to my existing session or create one for its own. (You can tell it ‘look at my browser for a sec’ then talk about the current page you are on and it just works, pretty cool) My custom browser tools are not perfect (not by a long shot) but I managed to make them work well to the point they are somewhat reliable. This gives Claude full access to my real creds and all the services I actually use. I’m productive AS HELL with this. It really feels like a personal assistant. I ask it to read my emails and msgs, check x .com for news, research arxiv papers, write code, run experiments for me, investigate and reverse engineer github repos, even use my credit card and order things. [I try not to do this one a lot lol so far no disasters]. All from my phone. Super convenient. This is not a product or an open source project (maybe soon of it will make sense). This is just an ugly script I hacked the entire thing is ~600 lines. (ok maybe i did look at the code, but i swear i didn’t edit!) You can also vibe code this from scratch pretty fast and it will probably even end up better. This is just a cool thing so I’m sharing. It is a real speed booster for many things I do on daily basis, mostly boring things. Forcing my routine into some new “agent platform” just didn’t feel right for me. WhatsApp is where I already communicate and look for messages, so I decided that my agents will live there too. AGI in my pocket 24/7.

Yam Peleg

420,390 views • 9 months ago

In AI-generated art, the idea is still where creativity begins. The idea behind this animation is mine. AI is simply the medium I chose to bring it to life. And when it can turn an idea into something this beautiful, why wouldn’t I use it? Don’t let other people decide which tools you’re allowed to create with. AI can be an incredible playground for creativity. If you’re already creative, it gives you new ways to explore that creativity. And if you’ve never thought of yourself as creative, you might discover a talent you didn’t even know you had. I just want people to enjoy art. And if AI inspires someone to start creating for the first time, they’re more than welcome to join the fun.

In AI-generated art, the idea is still where creativity begins. The idea behind this animation is mine. AI is simply the medium I chose to bring it to life. And when it can turn an idea into something this beautiful, why wouldn’t I use it? Don’t let other people decide which tools you’re allowed to create with. AI can be an incredible playground for creativity. If you’re already creative, it gives you new ways to explore that creativity. And if you’ve never thought of yourself as creative, you might discover a talent you didn’t even know you had. I just want people to enjoy art. And if AI inspires someone to start creating for the first time, they’re more than welcome to join the fun.

OscarAI

12,714 views • 2 days ago

i watched gemma 4 12b build something genuinely impressive today, and then loop itself to death right in front of me. the full run is in the video, sped up but completely uncut, watch it to the end and you will catch the exact moment it stops building and starts looping right in the middle of the work. the task was clean, build a single file gravity simulator, n-body physics, orbits, collisions, running locally on one 3090 through an agent. and for ten minutes it was a joy to watch. it reached for a symplectic integrator on its own, the correct one, the kind that keeps orbits stable instead of spiralling out. real gravity with softening, proper orbital velocities, momentum conserved on collision. the physics was right. the thing actually worked. then on the very last step, writing a few tests to prove its own code, it fell into a loop. not a crash, a loop. it started repeating itself and would not stop. ten more minutes, thirty four thousand tokens into a single answer, the same fragments over and over, until i killed it myself. so it's not that gemma can't code. it did the hard part beautifully. it cannot finish. it cannot hold a long task together without unravelling, and finishing is the entire job in agentic work. here's the part that stings. i run this exact task, same harness, same card, on the chinese open models, qwen especially, and i never see this. they build it, they test it, they stop. every single time. google has the raw capability, you can see it sitting right there in the code, and then the model loops itself to death on a task a 27b from alibaba finishes clean. open weights, apache 2.0, so much to love on paper. i just need it to know when to stop talking.

i watched gemma 4 12b build something genuinely impressive today, and then loop itself to death right in front of me. the full run is in the video, sped up but completely uncut, watch it to the end and you will catch the exact moment it stops building and starts looping right in the middle of the work. the task was clean, build a single file gravity simulator, n-body physics, orbits, collisions, running locally on one 3090 through an agent. and for ten minutes it was a joy to watch. it reached for a symplectic integrator on its own, the correct one, the kind that keeps orbits stable instead of spiralling out. real gravity with softening, proper orbital velocities, momentum conserved on collision. the physics was right. the thing actually worked. then on the very last step, writing a few tests to prove its own code, it fell into a loop. not a crash, a loop. it started repeating itself and would not stop. ten more minutes, thirty four thousand tokens into a single answer, the same fragments over and over, until i killed it myself. so it's not that gemma can't code. it did the hard part beautifully. it cannot finish. it cannot hold a long task together without unravelling, and finishing is the entire job in agentic work. here's the part that stings. i run this exact task, same harness, same card, on the chinese open models, qwen especially, and i never see this. they build it, they test it, they stop. every single time. google has the raw capability, you can see it sitting right there in the code, and then the model loops itself to death on a task a 27b from alibaba finishes clean. open weights, apache 2.0, so much to love on paper. i just need it to know when to stop talking.

Sudo su

39,764 views • 3 months ago