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Jon Jagger

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A Sixth Seam in TDD? - Python Testing, Test Doubles & Legacy Code at KosliACCU 20252025-04-01
Proposes a new test double called an auto cache that Kosli uses to speed and stabilise Python tests by replaying seam interactions from disk. Implements it as…
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Equal Rights for TestsACCU 20222022-04-06
Argues that tests must be equal to code and gives concrete practices: instrument tests for coverage and measure cyclomatic complexity of test functions with…
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Testing as an equal 1st class citizen (to coding)NDC TechTown 20212021-08-30
Argues that testing and coding must be equal first-class citizens with concrete practices: instrument tests (pytest/coverage) to spot dead code, aim for 100%…
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Everything you want to know about C/C++ pre-processor but couldn't askNDC TechTown 20182018-09-27
Claims the C/C++ preprocessor is almost Turing complete and demonstrates concrete tricks and pitfalls: string-literal concatenation that changes compiler…
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The ongoing design and evolution of cyber-dojoACCU 20182018-04-11
A browser‑based practice environment that deliberately strips IDE features and enforces a 10-second test timeout, spins each run in a Docker container via a…
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Design and Evolution of cyber-dojoACCU 20172017-04-24
cyber-dojo migrates from a Ruby monolith to separate services and a Travis-driven build chain where each repo builds a Docker image, runs its tests inside that…
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The design and implementation of cyber-dojoAgile on the Beach 20162016-07-06
cyber-dojo is a browser coding dojo that runs user code on the server inside Docker images and later moves the Rails app itself into a Docker image…
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The Story of CyberDojo (so far)ACCU 20162016-04-20
cyber-dojo.org is a browser-based practice environment (Ruby on Rails backend) that has over 30,000 practice sessions and ~8,000 commits. It runs submitted…
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