testing – Page 15 – Türker Yıldırım

Extracting a module without extracting a service

Deep diveFebruary 3, 202314 min read

A billing module everybody agrees should be separate, a team of four, and 88 classes that reference it. The boundary, drawn in code rather than in conversation.

A flaky test quarantine with a deadline attached

NoteJanuary 27, 20232 min read

A group of tests excluded from the pipeline “temporarily”, four of them since 2021. A quarantine without an expiry is a delete with extra steps. Adding a date…

The effect that ran twice, and the cleanup that fixed it

NoteJanuary 11, 20232 min read

Development mode mounting, unmounting and remounting every component is a diagnostic, and the double-fetch it produces is the diagnosis rather than the bug. An effect that cannot survive…

Readonly classes and the DTO that stopped needing a constructor

Deep diveDecember 20, 202210 min read

8.2 on 8 December, and readonly applied to a whole class. readonly on every property, written out forty times.

Larger runners, and the pipeline that was memory-bound

Deep diveDecember 13, 202210 min read

October, larger runners, and a build that was swapping. A Node build that used 6 GB on a 7 GB runner.

The dynamic property that had been a typo since 2016

Deep diveDecember 13, 202214 min read

8.2 on 8 December deprecates dynamic properties, and the deprecation is the feature. $order->totl has been silently creating a property for six years.

The webhook we sent, and the retries we owed

Deep diveDecember 7, 202210 min read

Being the sender, for the first time, and the obligations that come with it. A customer endpoint that was down for six hours.

Running mutation testing on the diff, not the suite

NoteNovember 24, 20221 min read

A full mutation run takes long enough to be a nightly job, and running it on the changed lines makes it usable in a pull request. Gating on…

A design system in theme.json and a stylesheet that agrees

Deep diveNovember 17, 202210 min read

6.1, fluid typography, and a stylesheet that had its own scale. Two definitions of a spacing scale, one in each place.

A pipeline that only builds what changed

Deep diveNovember 15, 202210 min read

A 22-minute pipeline on a repository where most changes touch one directory. Every push runs everything, including the untouched.