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ftes.de
Fredrik Teschke
@ftes.de
96 followers 180 following 120 posts
Elixir full-stack developer with that extra boost 🚀
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ftes.de
Fredrik Teschke @ftes.de · 5d
Any hints on how to implement resource sharing in ExUnit tests?

For phoenix_test_playwright, I want shared browser instances.
Browser pool, each test module has to wait for available browser in `setup_all`.
github.com/ftes/phoenix...

Have you seen/implemented something similar before?
#elixirlang
Feature request: Limit number of concurrent e2e tests · Issue #75 · ftes/phoenix_test_playwright
Hello 👋 Big thank you for your library, it made it possible to easily test my live_vue project. Just one small question: I enjoy running all my tests with mix test, no matter if they're e2e or not....
github.com
1 3
ftes.de
Fredrik Teschke @ftes.de · 11d
What happened that led to drastic drop of hex.pm downloads roughly 2 weeks ago?
#elixirlang
1
ftes.de
Fredrik Teschke @ftes.de · 11d
"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.
1
ftes.de
Fredrik Teschke @ftes.de · 16d
ievgenpyrogov.com/cleaning-up-...
Caught my attention on the radar. Now this I will use!

#elixirlang
Cleaning up code using ast-grep
ievgenpyrogov.com
2
ftes.de
Fredrik Teschke @ftes.de · 17d
How do you find a misbehaving part of your software?

Patience 🤣
Monitoring & Metrics (Prometheus, Grafana, cAdvisor, PRTG)
Error Tracking & Logging (Sentry, Firebase, log files)
Observability & Tracing (OpenTelemetry, metrics, distributed tracing)
User Feedback
ftes.de
Fredrik Teschke @ftes.de · 17d
What are your building blocks for robust systems?

Testing & Monitoring (unit/load tests, monitor, health checks)
Fault Tolerance (redundancy, circuit breakers, loose coupling)
Simple Architecture (KISS)
Load Distribution (client-side calcs)
"I would ask you" 🤣
1
ftes.de
Fredrik Teschke @ftes.de · 17d
Slides: ftes.github.io/dcon-elixir/
Let it Crash with Elixir
ftes.github.io
1
ftes.de
Fredrik Teschke @ftes.de · 17d
We asked two questions at our talk "Let it Crash - Designing Robust Systems".

What are your building blocks for robust systems?
How do you find a misbehaving part of your software?

Great answers in thread👇
My takeaway: The BEAM provides. Little need for other tools.
#elixirlang #devconnectowl
1 1
ftes.de
Fredrik Teschke @ftes.de · 24d
PhoenixTestPlaywright 0.8 released 🎉

- ⚡️ speed up refute_has
- ✅ support bunx
- ✅ support phoenix_test 0.8

And other quality of dev-life improvements.

#elixirlang
PhoenixTestPlaywright 0.8 changelog
3
ftes.de
Fredrik Teschke @ftes.de · 25d
learndmarc.com
Nice fresh semi-interactive take on both checking and explaining Email security.
Learn and test SPF, DKIM and DMARC
Visualize, analyze and improve your email authentication setup
learndmarc.com
Reposted by Fredrik Teschke
sasajuric.bsky.social
Saša Jurić @sasajuric.bsky.social · Aug 28
Sharing this with a big recommendation. You'll have a hard time finding someone as knowledgeable as @hauleth.dev
hauleth.dev
λ (λ 2 (1 1)) (λ 2 (1 1)) @hauleth.dev · Aug 28
Hi Bsky hivemind, is anyone looking for seasoned #ElixirLang developer? EMEA-based, fully remote.

Either consulting or full-time.
8 13
ftes.de
Fredrik Teschke @ftes.de · Sep 1
Not trying to blow my own horn here.
Probably mostly symptomatic of playwright being a fairly large project with multiple clients -> stable internal API, even if undocumented.
3
ftes.de
Fredrik Teschke @ftes.de · Sep 1
phoenix_test_playwright user base has grown to 50% of phoenix_test (judging by number of downloads in past 7 days).
Surprises:
1. High number of users. Metric skewed by few power users?
2. Low support effort. Lib is 90% undocumented playwright internals. Playwright js frequently updated.
#elixirlang
3 1 8
Reposted by Fredrik Teschke
zachdaniel.dev
Zach Daniel @zachdaniel.dev · Aug 28
Expert LS is out yall. #ElixirLang github.com/elixir-lang/...
GitHub - elixir-lang/expert: Official Elixir Language Server Protocol implementation
Official Elixir Language Server Protocol implementation - elixir-lang/expert
github.com
1 30 85
ftes.de
Fredrik Teschke @ftes.de · Aug 29
🤯
git commit --fixup
git rebase -i --autosquash
4
ftes.de
Fredrik Teschke @ftes.de · Aug 28
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
ftes.de
Fredrik Teschke @ftes.de · Aug 27
Interesting. With which of the 4 points would it help? Have you used it before?

Looks like WIP and - like igniter - aimed at transforming code. Unsure how that would help?!
1 1
ftes.de
Fredrik Teschke @ftes.de · Aug 27
Unit testing:
In test, import extracted hook from manifest file, just like you do in your `app.js`. Remember to run `mix compile` first so that the hooks are extracted into `_build`
Depending on your test setup, you may have to alter `NODE_PATH` just like you do for esbuild.
ftes.de
Fredrik Teschke @ftes.de · Aug 27
Formatting:
No support by LiveView.HTMLFormatter.
Can we expect built in formatting or extension points for external JS formatting tools in future? I don't know.
1
ftes.de
Fredrik Teschke @ftes.de · Aug 27
JS Intellisense (language server features):
Same as for 'Code highlighting'.
1
ftes.de
Fredrik Teschke @ftes.de · Aug 27
Code highlighting:
Same support as normal `<script>` tags.
Currently for zed: No highlighting in `.html.heex` files or `~H` sigils.
1
ftes.de
Fredrik Teschke @ftes.de · Aug 27
LiveView colocated hooks:
Skip for now due to lack of tooling support?

1. Code highlighting
2. JS Intellisense (language server features)
3. Formatting
4. Unit testing

Any thoughts?
Some of mine in thread 👇

#elixirlang
2 1 2
ftes.de
Fredrik Teschke @ftes.de · Aug 27
Unit testing:
In test, import extracted hook from manifest file, just like you do in your `app.js`. Remember to run `mix compile` first so that the hooks are extracted into `_build`
Depending on your test setup, you may have to alter `NODE_PATH` just like you do for esbuild.
ftes.de
Fredrik Teschke @ftes.de · Aug 27
Formatting:
No support by LiveView.HTMLFormatter.
Can we expect built in formatting or extension points for external JS formatting tools in future? I don't know.
1
ftes.de
Fredrik Teschke @ftes.de · Aug 27
JS Intellisense (language server features):
Same as for 'Code highlighting'.
1