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Urchin is a portable shell test harness based on the idea that a test case should be an ordinary Unix-style program. It's called "Urchin" because sea urchin shells are called "tests".
I'll discuss how one uses Urchin, and I'll show examples of tests written in Urchin. Urchin is mostly (entirely?) used for running shell tests to test shell programs, so I'll also compare it with other approaches to testing shell programs.
Thomas Levine is a neodada artist with an interest in sleep. He enjoys writing intuitive and minimal user interfaces, like Urchin, that are thus easy to learn and easy to reverse-engineer.