code-coverage – Page 3 – Türker Yıldırım

PHPUnit 11, and a suite that had already been migrated

Deep diveFebruary 29, 20249 min read

11.0 in February, a year after the 10.0 migration did the hard part, and eleven deprecations that were all things 10 had warned about.

The migration Rector wrote and we rewrote

Deep diveFebruary 7, 202410 min read

An automated refactor across 412 files, a diff of 8,000 lines, and three wrong hunks in it. The review nobody could actually do.

Snapshot tests for a generated stylesheet

NoteJanuary 16, 20241 min read

A token pipeline whose output is a stylesheet, and no test at all because the transforms had unit tests. Unit tests on each transform proved every stage correct…

Branch coverage at 100%, and meaningless

NoteDecember 30, 20231 min read

Every branch executed, and no assertion that any of them produced the right answer. The assertTrue(true) is the tell, and it exists because a test with no assertions…

The method that stopped overriding anything in 2019

Deep diveDecember 5, 202310 min read

#[Override] in 8.3, and what it asserts. A subclass method dead since a parent rename four years ago, with a bug report closed as not reproducible.

Mutation testing on the money code only

NoteOctober 26, 20232 min read

A full mutation run takes nine hours; a run over one directory takes eleven minutes and answers the question that matters. The gap between 94% coverage and 71%…

Mutation testing for one directory, and what it found

Deep diveOctober 24, 202310 min read

94% line coverage on the pricing code, and a bug that shipped anyway. A test that called the method and asserted it did not throw.

A suite that runs in four minutes because it stopped touching the database

Deep diveMay 28, 202310 min read

1,400 tests, fourteen minutes, and 1,100 of them opening a transaction against MySQL for no reason anybody could name.

The generic PHP does not have, and the analyser that does

Deep diveFebruary 27, 20239 min read

A collection class that returns mixed, and forty call sites asserting the type by hand. Docblock generics, and where they stop being worth it.

PHPUnit 10, and the listeners that no longer exist

Deep diveFebruary 20, 202314 min read

10.0 in February, a configuration file that has accreted since 2014, and a custom TestListener that the new version has no place for.