Write failing tests against stub implementations to define executable specifications.
npx skills add https://github.com/sofer/.agents --skill test-sofer
Please help me install this Agent Skill. Skill: test Source: https://github.com/sofer/.agents/tree/main/skills/test Command: npx skills add https://github.com/sofer/.agents --skill test-sofer
Tests define expected behaviour before implementation by driving stub development in the red phase of TDD.
Write tests that fail due to NotImplementedError and then implement the stubs to satisfy them.
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To write unit tests against stub implementations in TDD, you define executable specifications by creating tests that fail in the red phase due to NotImplementedError, then implement the stubs to satisfy the expected behaviors and drive regression safety.
The red phase in test-driven development is the initial stage where you write executable specifications that fail because the target logic is unimplemented. Stubs raise NotImplementedError to validate interfaces and define expected behaviors before coding the real logic.
Yes, you can use stubs to define expected behaviors for integration tests. This approach applies to both unit and integration boundaries to drive design and ensure regression safety by keeping a runnable spec of the system before coding the real logic.
The best way to structure tests around stubs that raise NotImplementedError is to write tests that define expected interfaces and behaviors first. This drives stub development in the red phase, providing patterns and examples to ensure regression safety.
Test-driven development stubs fail during the red phase because they are intentionally unimplemented, raising NotImplementedError. This validates interfaces and defines expected behaviours before coding the real logic, ensuring the tests act as a runnable spec.
DevelopersGlobalTransform informal project ideas into structured, testable specifications.
bobmatnycEnforce test-first development with RED/GREEN/REFACTOR workflows.
hmpsGuide test-first workflows by writing failing tests before production code.
interserverGenerate Jest-free unit tests with Mocha, Chai, and Sinon.
