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Fredrik Teschke @ftes.de · 02/09/2026

Spot the AI mistakes. But this is incredibly good - one shot, given minimal reference video & images. #bogengaudi #arrowtag

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Fredrik Teschke @ftes.de · 27/08/2026

Nice, interested to try this out. Have you by chance ever used AppSignal's N+1 detection? I've never seen it trigger - but supposedly it could highlight N+1 queries. Only if they result in overall slow pages (events) though. Totally different approaches - using both together could make sense.

Codex comparison of ecto_n_plus_one and AppSignal N+1 detection.

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Fredrik Teschke @ftes.de · 19/06/2026

phoenix_test_playwright 0.15.0 released 🎉 - 📷 assert_screenshot for snapshot testing by Wigny - support new phoenix_test checked/selected assert options - playwright 1.61 support (also update playwright_ex to 0.7.1) #elixirlang

Changelog for phoenix_test_playwright v0.15.0

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Fredrik Teschke @ftes.de · 27/02/2026

Exploring 1. Synergy effect of vertical integration: browser driver doubles as HTML spec oracle for live/static driver tests. 2. Webdriver BiDi instead of playwright (more like cuprite) #elixirlang

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Fredrik Teschke @ftes.de · 22/02/2026

phoenix_test_playwright v0.12.0 released 🥳 Shorthand to eval JS in browser, assert_path fixes for LiveView navigations, and more. Also ships with usage-rules.md for LLM coding agents. 🤖 #elixirlang

phoenix_test_playwright 0.12.0 changelog

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Fredrik Teschke @ftes.de · 30/01/2026

phoenix_test_playwright 0.10.1 released 🥳 Small macro, big effect 🪄: step/3 groups trace actions and AUTOMATICALLY links to source code line Big thanks to @nathanl for adding this! #elixirlang

step/3 macro automatically links playwright trice to source code

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Fredrik Teschke @ftes.de · 21/11/2025

Bump phoenix to debian trixie #elixirlang phoenix generator diff: github.com/phoenixframe...

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Fredrik Teschke @ftes.de · 13/11/2025

#ElixirConfEU call for talks is open (Apr 23-24, Malaga). I submitted: Changeset driven forms. Interested? Which aspects should I focus on? 👇 #elixirlang www.elixirconf.eu

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Fredrik Teschke @ftes.de · 05/11/2025

Deciding on my CodeBEAM Europe agenda. Still some conflicts I need to resolve. Any tips? And wow, are there a lot of interesting #Gleam talks. Hadn't planned for this, but looks like I'll be learning some more Gleam. #elixirlang

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Fredrik Teschke @ftes.de · 26/10/2025

Surprising ⚡️: Performance of phoenix_test_playwright already pretty good. Compared to official javascript client. Many tests: browser re-use (experimental) brings slight boost. Unclear if worth the complexity. Do you need it? github.com/ftes/phoenix... #elixirlang

Performance of playwright JS vs phoenix_test_playwright

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Fredrik Teschke @ftes.de · 30/09/2025

What happened that led to drastic drop of hex.pm downloads roughly 2 weeks ago? #elixirlang

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Fredrik Teschke @ftes.de · 30/09/2025

"Let it Crash - Designing Robust Systems" Our talk included a Live Demo with audience participation. 👇 More details about what Marcus and I did at Dev Connect OWL. ftes.de/articles/202... #elixirlang

Complecting code paths: Meme with 3 spidermen pointing at each other.

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Fredrik Teschke @ftes.de · 17/09/2025

PhoenixTestPlaywright 0.8 released 🎉 - ⚡️ speed up refute_has - ✅ support bunx - ✅ support phoenix_test 0.8 And other quality of dev-life improvements. #elixirlang

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Fredrik Teschke @ftes.de · 28/08/2025

Local code review = more collaboration (everybody edits/shares/reviews) This really resonates with me, I have often wished for that. youtu.be/MUqvXHEjmus?...

Coding is more collaborative via Jane Street local code review approach

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Fredrik Teschke @ftes.de · 25/08/2025

Common phoenix pitfalls when upgrading to LiveView 1.1 Tests may break in several ways. - HTML boolean attrs like 'checked' rendered differently - stricter CSS selectors due to lazy_html - phoenix_test needs fix #45 (unreleased) #elixirlang

How to fix phoenix_live_view tests when upgrading to 1.1

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Fredrik Teschke @ftes.de · 24/07/2025

TIL tiny iex helper function v/1 Returns the value of the nth expression in the history. hexdocs.pm/iex/IEx.Help... #elixirlang

iex v/1 function returns nth last return value

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Fredrik Teschke @ftes.de · 07/07/2025

Excited to give this talk in September: Your stack is too damn complex Let it crash with Elixir at #devconnectowl Introducing #elixirlang and #beamvm to Java folks. Will use @sasajuric.bsky.social 's "Soul of Erlang and Elixir" demo. Thank you so much!

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Fredrik Teschke @ftes.de · 30/06/2025

dependabot + elixir issue? Error persists after re-running. Worked last week, now failing (no other changes). Not on all repos, maybe related to oban pro private repo? Logs indicate url.host is nil - no idea which url though. #elixirlang

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Fredrik Teschke @ftes.de · 29/04/2025

lightpanda.io Lightpanda (WIP headless browser from scratch) explicitly mentions playwright as use case now. Should be able to benefit in phoenix_test_playwright soon if we add websocket support. #elixirlang

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Fredrik Teschke @ftes.de · 24/04/2025

blog.sequinstream.com/why-we-built... Well written, interesting conclusion.

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Fredrik Teschke @ftes.de · 01/04/2025

Reduced the number of errors, but didn't eliminate them. Still seeing a 401 for oban repo in the logs. And it seems to bleed into unrelated dependencies. Looks like there is some concurrency and event handling, and error events are sometimes attributed to the wrong dependency.

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Fredrik Teschke @ftes.de · 31/03/2025

📣 Tired of ugly browser confirmation popups in your Phoenix app? I just published "Beyond data-confirm". Spice up those boring alerts to match your design system, with just a few lines of code! 👉 ftes.de/beyond-data-... #ElixirLang #UX

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Fredrik Teschke @ftes.de · 18/03/2025

Special shout out to @pecaeful-james for reverse engineering the Phoenix/Plug session cookie github.com/ftes/phoenix...

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Fredrik Teschke @ftes.de · 18/03/2025

Released phoenix_test_playwright 0.6.0 🎉 Manipulate cookies. Use case: fast non-UI log in (thx @peaceful-james) New option browser_launch_timeout: more fine-grained control for CI (thx @tylerayoung.com) #elixirlang

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Fredrik Teschke @ftes.de · 17/02/2025

Neat trick to mock external HTTP services with Bandit.

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Fredrik Teschke @ftes.de · 15/02/2025

phoenix_test_playwright 0.5 released 🥳

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Fredrik Teschke @ftes.de · 15/12/2024

Slight improvement: @tag trace: :open opens up the trace viewer automatically after the test finished. Just released in v0.1.5

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Fredrik Teschke @ftes.de · 15/12/2024

View a step-by-step playback of your feature test incl. JS console and network. Powered by PhoenixTest + trace.playwright.dev Great tool to debug feature test failures in CI. #ElixirLang

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