Built-in skill — test generation from implementation code.
Injects a system-prompt section covering happy paths first, then edge cases (empty input, boundary values, nil, maximum sizes), error cases (invalid input, network failure, timeout, permissions), integration points and candidate properties — while telling the model to follow the project's existing test conventions and keep every test independent.
Activates on prompts containing "write test", "generate test", "add test",
"test case", "test for" or "create test". Group :testing;
tags :test, :testing, :quality.