FFmpeg thinks it has a disk
FFmpeg assumes a disk it can seek around in. Giving it a convincing in-memory filesystem, and testing the behaviour that would hurt most first.
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9 pages
Testing
The scaffolder that won't hand you code that doesn't compile
A Rust scaffolder with an AI codegen path that drafts a real command, then refuses to hand it over until it compiles and passes lint.
When you hand the same key to every call
A generated nested command would not compile, and the cause was a scaffolder handing every call the same key regardless of depth.
From allow_failure to blocking
Turning three advisory CI jobs into real gates once they were trustworthy enough to block a merge, and how to tell when they are.
Process isolation won't save you from the filesystem
A flaky self-update test: separate processes still shared a computed cache path and raced on disk. Process isolation is not filesystem isolation.
The test-mocking pattern that races
Reassigning a package-level function variable in tests is a latent data race that t.Parallel exposes. The fix is structural, not another lock.
Testing code that calls an LLM: yes, you actually can
You cannot test the model, but you can test your code: snapshot the prompt as a golden file and mock the response to cover the ugly cases.
BDD where it earns its place, and nowhere else
BDD earns its place on narratives such as a lifecycle state machine, and nowhere else. Keep table-driven Go tests as the baseline everywhere.
Loaded Testing
Distributed load testing with Apache JMeter on EC2: build a reusable AMI running jmeter-server, and fix the NAT and RMI hostname problems.