From the Leanpub Blog: Leanpub Book LAUNCH 🚀 Testing Rails from Scratch: A practical, (mostly) out-of-the-box approach to test-driven development in Ruby on Rails by Aaron Sumner

https://leanpub.com/blog/leanpub-book-launch-testing-rails-from-scratch-a-practical-mostly-out-of-the-box-approach-to-test-driven-development-in-ruby-on-rails-by-aaron-sumner/

#books #leanpublishing #selfpublishing #RubyOnRails #TDD #Minitest #RailsTesting #TestDrivenDevelopment

NEW! Leanpub Book LAUNCH 🚀 Testing Rails from Scratch: A practical, (mostly) out-of-the-box approach to test-driven development in Ruby on Rails by Aaron Sumner

https://youtu.be/Zo7M4Cp-ndw

#books #leanpublishing #selfpublishing #RubyOnRails #TDD #Minitest #RailsTesting #TestDrivenDevelopment

I've just released AceUnit v3.1.0.
AceUnit is a unit test framework for C.
Enjoy!
https://github.com/christianhujer/aceunit
#TDD

Indirect inputs and outputs are essential to understanding the different kinds of test doubles. This concept helps to determine when to use a dummy or stub, and when to use a spy or mock.

You can read more in the following article:
https://principal-it.eu/2020/04/indirect-inputs-and-outputs

#tdd #testdrivendevelopment #unittests #unittesting #softwaredesign

I'm proud to announce that my very first learning hour has been published on the Samman Coaching website. The topic of this new learning hour is the 𝐅𝐢𝐱𝐭𝐮𝐫𝐞 𝐎𝐛𝐣𝐞𝐜𝐭 pattern. A big thank you to @emilybache for her feedback and also for accepting my contribution.

https://sammancoaching.org/learning_hours/test_design/fixture_object.html

#technicalcoaching #softwaredesign #tdd #testdrivendevelopment

I am working on a project that uses Stripe and I need to check that required text elements are contained in the invoice PDFs, however Stripe's invoice fonts map punctuation (-, (, :) to NUL in the PDF text layer, so text extracted from the PDF file using e.g. pdf.js has 2026-06-01 printed as 2026\x0006\x0001 which makes writing good assertions hard. I switched to using https://aws.amazon.com/textract/, which OCRs the document and preserves punctuation, spaces and line breaks. Super convenient!
#tdd #aws

What if a defect in your system is actually a missing test? The Saff Squeeze technique helps you find both the defect and the missing test. A practical approach to debugging that leaves your codebase stronger.

Read more about it in my latest article:
https://principal-it.eu/2026/06/the-saff-squeeze/

#testing #qa #softwarequality #tdd

Just heard that a third person thinks that #TDD is a good idea.
Outside of my own bubble.
😮‍💨

🙈 You wouldn't ship backend code without tests. Why are we shipping SwiftUI without unit tests? Let's fix that. https://qualitycoding.org/swiftui-tdd-first-failing-test-part-1/ #TDD

What I’ve been reading week ending 31 May 2026 https://medium.com/@jchyip/what-ive-been-reading-week-ending-31-may-2026-84dfd1ed83e1 #TDD #FowardDeployedEngineering #AI #Leadership #ProjectManagement #ProductManagement #Productivity #Strategy

RE: https://mastodon.cloud/@jasongorman/116640520323934787

I can highly recommend this workshop!
I’ve been working as a software developer for 15 years and have attended #TDD workshops before. Here, I learnt a great deal in just two hours.
The price is a bargain.
If you’re lucky, it’ll be a small group again and you’ll get plenty of access to Jason’s wisdom.

George Dinwiddie boosted

Jason Gorman » 🌐 2026-05-26
@jasongorman@mastodon.cloud

Now, it's either something about the evening of June 2nd, or 38 people really is market saturation within my social media reach.

Still plenty of spaces available on June 2nd 18:45 BST for self-funding folks who want to learn TDD.

Last TDD workshop of this run, last one at this price.

Much more than just red-green-refactor!

Register here -> https://www.tickettailor.com/events/codemanship/2131015

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Diagram of the Test-Driven Development red-green-refactor cycle that incorporates version control and continuous integration.

What (almost) Everyone Gets Wrong About #TDD & #BDD

https://antonymarcano.substack.com/p/what-almost-everyone-gets-wrong-about-c05?triedRedirect=true

The box of boxes is here! If you're going to be at DDD Europe, SoCraTes UK, or in Munich and want to save on shipping, contact me NOW before they're all claimed!

If you're in North America, I'm ready to ship it to you: https://tdd.cards

#TDD #BoardGame

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Shipping box with 8 newly manufactured copies of "JitterTed's TDD Game"! The hex tiles are separately packaged as it's my job to punch them out and assemble everything.

Munich folks:

I have a free day in Munich June 29, I can give a talk at your company, meetup, or user group, or we can play a game about #TDD.

I'd love to share my experience with Event Sourcing and Java, or facilitate a session playing JitterTed's TDD Game.

Let me know!

"Don't put loops in your tests" the advice goes. While there are times when a small for loop might be useful, for gosh sakes, don't use a do..while loop.

And please don't ask me what triggered this post.

p.s. Your for loop might also be hiding a deficiency in your test, aka a Test Smell. Might be fine, but worth a little more attention.

#Testing #TDD

🧪 TDD + ViewInspector: Writing Your First Failing SwiftUI Test https://qualitycoding.org/swiftui-tdd-first-failing-test-part-1/ #TDD

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SwiftUI TDD (Part 1): Writing Your First Failing Test

𝐓𝐨𝐝𝐚𝐲, 𝐀𝐩𝐫𝐢𝐥 27, is the last day to secure your spot at the 𝐞𝐚𝐫𝐥𝐲-𝐛𝐢𝐫𝐝 𝐫𝐚𝐭𝐞 for my workshop 𝐖𝐞𝐥𝐥-𝐁𝐚𝐥𝐚𝐧𝐜𝐞𝐝 𝐓𝐞𝐬𝐭-𝐃𝐫𝐢𝐯𝐞𝐧 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭. Join us on 𝐌𝐚𝐲 21-22, 2026 at 𝐓𝐡𝐞 𝐁𝐫𝐚𝐢𝐧 𝐄𝐦𝐛𝐚𝐬𝐬𝐲 𝐢𝐧 𝐀𝐧𝐭𝐰𝐞𝐫𝐩 .

Don’t miss this final chance to invest in your skills at a reduced price.

🔗 𝐒𝐞𝐜𝐮𝐫𝐞 𝐲𝐨𝐮𝐫 𝐬𝐩𝐨𝐭 𝐧𝐨𝐰.

For more information: https://principal-it.eu/training/well-balanced-test-driven-development.html

#tdd #testdrivendevelopment #unittests #unittesting #softwaredesign

Hello! #introduction

I just migrated from https://hachyderm.io/@mattwynne which was 👍🏻, but I have been meaning to move over here for some time because I love the initiative to democratically run our social media!

I'm from the UK originally, now based in Nelson, BC.

I'm a generalist/polyglot programmer. I lead the https://github.com/cucumber #opensource project and I'm known for coaching teams in technical practices like #TDD/#BDD and #EnsembleProgramming.

Also #SkiTouring and generally #MountainLiving

Struggling with brittle tests that slow you down? Join my 𝐖𝐞𝐥𝐥-𝐁𝐚𝐥𝐚𝐧𝐜𝐞𝐝 𝐓𝐞𝐬𝐭-𝐃𝐫𝐢𝐯𝐞𝐧 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭workshop on 𝐌𝐚𝐲 21-22, 2026 in Antwerp! Learn how to write reliable, maintainable tests that help you think about software design and prevent defects. Early -bird tickets are available until 𝐀𝐩𝐫𝐢𝐥 19.

For more information: https://principal-it.eu/training/well-balanced-test-driven-development.html

#tdd #unittests #softwaredesign #softwarecrafting #xp

In Test-Driven Development (#TDD), a RED test is only part of the story. Just because a test fails, doesn't mean that you're ready to write code to make it GREEN. Before you write that code, check that the test fails as it is SUPPOSED to fail.

Another stream, another set of notes. So much "new"!

I try out a new design for Projectors, splitting EventConsumer into two pieces. Test-driving shows how it's about design exploration, not just writing tests.

https://ted.dev/articles/2026/04/06/live-coding-journal-apr-6-2026/

#Java #EventSourcing #TDD

“I’m writing unit tests because I have to. They just confirm that my code works, which I already know. They are tedious to write, and often stop working when I change the implementation of the system. Maintaining unit tests is often difficult and takes a lot of time out of my day.”

Does this sound familiar? Then you might be interested in my workshop, 𝐖𝐞𝐥𝐥-𝐁𝐚𝐥𝐚𝐧𝐜𝐞𝐝 𝐓𝐞𝐬𝐭-𝐃𝐫𝐢𝐯𝐞𝐧 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭, on 21 𝐚𝐧𝐝 22 𝐌𝐚𝐲 2025 𝐚𝐭 𝐓𝐡𝐞 𝐁𝐫𝐚𝐢𝐧 𝐄𝐦𝐛𝐚𝐬𝐬𝐲 𝐢𝐧 𝐀𝐧𝐭𝐰𝐞𝐫𝐩.

#tdd #unittests #softwaredesign #softwarecrafting

This two-day, hands-on workshop blends theory with practice in a real-world codebase. Yotdd #unittests #softwaredesign #softwarecrafting #xp to master the art of writing loosely coupled and highly maintainable automated developer tests.

𝐑𝐞𝐠𝐢𝐬𝐭𝐞𝐫 𝐛𝐲 𝐀𝐩𝐫𝐢𝐥 19 𝐭𝐨 𝐭𝐚𝐤𝐞 𝐚𝐝𝐯𝐚𝐧𝐭𝐚𝐠𝐞 𝐨𝐟 𝐭𝐡𝐞 𝐞𝐚𝐫𝐥𝐲-𝐛𝐢𝐫𝐝 𝐝𝐢𝐬𝐜𝐨𝐮𝐧𝐭! Spots are limited, so visit my website (https://principal-it.eu/training/well-balanced-test-driven-development.html) to learn more and secure your spot.

#tdd #unittests #softwaredesign #softwarecrafting

We organise in the open, and you're very welcome to chat with the organisers to help, ask questions, give feedback, or simply to watch. You can reach us on the #ev_socratesuk slack channel (https://slack.softwarecrafters.org/), or on mastodon, LinkedIn, BlueSky, or by emailing organisers at socratesuk dot org.

#SoftwareCraft
#Unconference
#OpenSpace
#TDD
#Refactoring

We organise in the open, and you're very welcome to chat with the organisers to help, ask questions, give feedback, or simply to watch. You can reach us on the #ev_socratesuk slack channel (https://slack.softwarecrafters.org/), or on mastodon, LinkedIn, BlueSky, or by emailing organisers at socratesuk dot org.

#SoftwareCraft
#Unconference
#OpenSpace
#TDD
#Refactoring

Back to streaming, with notes from yesterday's stream: https://ted.dev/articles/2026/03/23/live-coding-journal-mar-23-2026/

I chatted about consistency boundaries, missing-event heuristics, and encoding (serializing) events.

#EventSourcing #Java #TDD

We organise in the open, and you're very welcome to chat with the organisers to help, ask questions, give feedback, or simply to watch. You can reach us on the #ev_socratesuk slack channel (https://slack.softwarecrafters.org/), or on mastodon, LinkedIn, BlueSky, or by emailing organisers at socratesuk dot org.

#SoftwareCraft
#Unconference
#OpenSpace
#TDD
#Refactoring

Finding a failing test 🚨, coming back from the ☕️ break, feels just so ✅ .

- I know where I left off
- I know what to continue with
- I get back into the flow within seconds
- no need to search and analyze the git history
- it 💡 enlightens me and lets me continue where i left off

also when doing hashtag#PHP 😎

#unittest #testing #tdd #engineering #workflow #productive

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black font on red bg saying "failed"

The pivotal session that is helping me see a path forward for AI-augmented test-driven development.

(Video is a bit rough 'n' ready, but packed with insights...er, once we got going...)

#AIdevelopment #LLMs #agentic #TDD #softwaredevelopment

https://youtu.be/Oz3KS9-Yohg

We organise in the open, and you're very welcome to chat with the organisers to help, ask questions, give feedback, or simply to watch. You can reach us on the #ev_socratesuk slack channel (https://slack.softwarecrafters.org/), or on mastodon, LinkedIn, BlueSky, or by emailing organisers at socratesuk dot org.

#SoftwareCraft
#Unconference
#OpenSpace
#TDD
#Refactoring

We organise in the open, and you're very welcome to chat with the organisers to help, ask questions, give feedback, or simply to watch. You can reach us on the #ev_socratesuk slack channel (https://slack.softwarecrafters.org/), or on mastodon, LinkedIn, BlueSky, or by emailing organisers at socratesuk dot org.

#SoftwareCraft
#Unconference
#OpenSpace
#TDD
#Refactoring

In fact, tooling hasn’t ever made much of an impact in these areas at all, especially compared to disciplined practice on the part of collaborative knowledge workers. That’s why we’ve invented #UCD, #agile, #TDD... all of these are habits of complexity-tending, and they’re what disposes systems toward producing value, if anything does. 6/7 #AI #software

#PairProgramming (if you'd like to) #TDD #JUnit5 #Kotlin #Java

- Also set status when not complete or green (tx Ron)
- Setup-free .gitignore (tx Llewellyn)
- Refactorings (tx Llewellyn, Petar)
- TrunkVer (tx Raimo & Chris)

#JUnit5 #TDD