Sergio Sastre

👨‍💻My droidcon talk
„Let‘s @Preview the future: Automating Screenshot Testing in CMP“
is out! 👇
www.youtube.com/embed/zYsNXr...

I covered Preview Screenshot Testing for
✅ Android (including animations)
✅ Desktop
✅ Common

Hope you enjoy it almost as much as I did!
#dcbln25

🛝 Just updated the 𝗔𝗻𝗱𝗿𝗼𝗶𝗱 𝗦𝗰𝗿𝗲𝗲𝗻𝘀𝗵𝗼𝘁 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 𝗣𝗹𝗮𝘆𝗴𝗿𝗼𝘂𝗻𝗱!

All the libraries are now on their 𝒍𝒂𝒕𝒆𝒔𝒕 𝒗𝒆𝒓𝒔𝒊𝒐𝒏𝒔, so you can try screenshot testing with the most up-to-date tools!

👉 github.com/sergio-sastr...

#AndroidDev
#Testing

YouTube video by droidcon & fluttercon 📸 Automating Screenshot Tests | Sergio Sastre Flórez at droidcon Berlin 2025

See you tomorrow @droidcon.bsky.social where I‘ll be talking about

📸 Automating Screenshot testing in CMP with @Previews
youtube.com/shorts/q5Kmx...

Just right after the keynote 😉

I am a big fun of Junie I must say ❤️
Much better than Gemini at the moment imho

Thanks to everybody who attended my talk at Droidcon Lisbon!

🔎 Let's @Preview the future: Automating Screenshot Testing in CMP

It was a blast!

You can already find the slides in my SpeakerDeck👇
speakerdeck.com/gio_sastre/l...

...or even better, watch me live at Droidcon Berlin in a few weeks! 😉

🇵🇹 Super excited to be talking at Droidcon Lisbon in 2 days again!

I’ll start with a quick screenshot testing intro & then take on the challenge:
⚡️ In ~20 mins of live coding, I’ll spin up automated screenshot tests from Compose Previews: Android, Desktop & Common.

Let’s make it happen 💪

🔥 ComposablePreviewScanner 0.7.0 is out!

It packs 2 new features:
✅ Supports Glance Previews, helping auto-generate screenshot tests from them with any screenshot testing library
✅ Same for Compose Multiplatform Previews in common code

Give it a try👇
github.com/sergio-sastr...

Setting up Compose Multiplatform previews Compose Multiplatform now has support for previews in common code. Here's how you can get started with using them.

Did you know you can use Compose previews with Compose Multiplatform now? I wrote a quick blog post about how to get started with them.

zsmb.co/compose-mult...

Built a Gradle plugin to auto-generate Paparazzi screenshot tests from @Preview composables with ComposablePreviewScanner!

Not published, just a showcase to avoid boilerplate in multi-module setups.
Inspired by Roborazzi, built with Firebender 🔥

👉 github.com/sergio-sastr...

🥁 Big news! The first batch of speakers for #dcbln25 are LIVE — & we’re kicking things off with a banger ⚙️

@marcinmoskala.bsky.social goes over how to master async debugging in #Kotlin – learn to fix #coroutine bugs, boost performance & avoid pitfalls in #Android berlin.droidcon.com/speakers/mar...

GDE Summit in full swing! With @sinankozak.bsky.social

#GDESummit2025

#mDevCamp 2025 is just around the corner!
Swing by the Concrete Break room next Tuesday afternoon — I’ll be sharing some practical tips & tricks for working with Compose Multiplatform Previews.

See you there! 😉

mdevcamp.eu/schedule...

GitHub - sergio-sastre/roborazzi at demo/kug_munich_presentation Make JVM Android integration test visible 🤖📸. Contribute to sergio-sastre/roborazzi development by creating an account on GitHub.

@zsmb.co
Here the slides:
speakerdeck.com/gio_sastre/l...

And here the branch with code to autogenerate screenshot tests from Android, Desktop & Common previews in the respective modules
github.com/sergio-sastr...

I'll be giving my first talk of the year for the Kotlin User Group Munich, at Google offices.

This time I'll talk about Screenshot Testing in CMP with some live coding!

There's already a waiting list, but if you're joining, come to say hello!

www.meetup.com/kotlin-user-...

Release 2.0.0-alpha01 · cashapp/paparazzi New Support for editable text in accessibility snapshots Support for error description in accessibility snapshots Support progress compose semantics in accessibility snapshots Support custom actio...

📸 Paparazzi 2.0.0-alpha is out!

github.com/cashapp/papa...

Main focus on accessibility improvements!

Nothing better than sports to help with your physical and mental health…

This session I was on fire 🔥🔥🔥

Although it took me a while to warm up, once I turned on the camera I did not fail any trick, except the last one, which took me around 5 attempts

1. Team does not meet sprint goals often, but never misses a deadline and has very low bug rate

2. Team meets all sprint goals, but misses deadlines sometimes and has noticeable bug rates.

The main reason why I dislike Scrum A LOT is because it favours working like team 2.

Don‘t be team 2 🙏

Unit testing each class of a system in isolation sounds good in theory: It ensures each piece works on its own. The hard truth is that it’s a practice that normally produces almost no value 🤷‍♂️

But it is even worse: it creates a false sense of safety and swallows lots of time from developers 🧵

Pero pasa el link @xurxodev.com ! Me tienes intrigadísimo 😂😂

I must say I only had problems with WiFi in Deutsche Bahn once and I take trains twice a month.

If we talk about delays… DB is simply unbeatable 😅

Thanks Thomas! See you in IO/Connect & EMEA summit 😉

Thanks Simon! We have to catch up!

Celebrating 10 years married! 🎉
A walk through Olympia Park, a slice of cake, and a reminder that the little moments are the big ones ❤️

It's a double feature this week 🤠

- Medium: Debugging Coroutines in IntelliJ and Android Studio

- Spotify: Kotlin Khronicles ep2

Thanks @kotlinweekly.bsky.social for bringing together the global community 💯

Samsung doing Samsung things 😬

a man in a suit and tie is sitting in front of a large building ALT: a man in a suit and tie is sitting in front of a large building

Kotlin compiler?

Un gran desarrollador no es quien sabe más lenguajes o frameworks. Es quien convierte problemas complejos en soluciones sencillas.

Now that Android Studio Narwahl is out…Do you know that you can also auto-generate screenshot tests from @Previews in “common” using 𝐂𝐨𝐦𝐩𝐨𝐬𝐚𝐛𝐥𝐞𝐏𝐫𝐞𝐯𝐢𝐞𝐰𝐒𝐜𝐚𝐧𝐧𝐞𝐫 ?
github.com/sergio-sastr...

There is already an executable example in the 𝐑𝐨𝐛𝐨𝐫𝐚𝐳𝐳𝐢 library 👇
github.com/sergio-sastr...

By the way, this Droidcon is my favourite, I’m sure you’ll enjoy it ❤️