Provides Jest unit and snapshot testing strategies for interpreters, parsers, and async code.
npx skills add https://github.com/mcclowes/lea --skill jest-testing
Please help me install this Agent Skill. Skill: jest-testing Source: https://github.com/mcclowes/lea/tree/main/.claude/skills/jest-testing Command: npx skills add https://github.com/mcclowes/lea --skill jest-testing
This Skill provides strategies for writing Jest tests tailored to interpreters, parsers, and asynchronous code, helping you verify correctness faster and with less guesswork.
Create a Jest test file that validates a simple Lea expression and run the test suite.
High-intent search queries and answers about installing and using this skill.
Jest tests for interpreters and parsers follow the Arrange-Act-Assert pattern: set up test input (lexer tokens, parse trees, or expressions), run the interpreter or parser logic, then assert the output matches expected results. Use one assertion per test and descriptive names to isolate each behavior.
Test async operations by returning promises from test functions or using async/await syntax. Jest waits for promise resolution before completing the test. Mock promise-returning dependencies to control timing and simulate success or failure paths without real delays.
Snapshot tests capture and validate formatting output from interpreters in a single assertion. Use them for verifying that parse trees, formatted code, or runtime results remain consistent across changes, but pair them with unit tests that verify specific behavior.
Yes. TypeScript configuration is required to run Jest tests against interpreter, parser, and async code. Set up ts-jest or a compatible transformer in your Jest config to compile TypeScript before test execution.
Use jest.mock() to replace modules, or jest.spyOn() to monitor and stub specific functions. For async mocks, return resolved or rejected promises to simulate success and failure scenarios without executing real logic.
Yes. Organize tests by component: lexer tests validate token output, parser tests verify abstract syntax trees, and interpreter tests check runtime behavior. Keep each test isolated with its own input and one assertion to maintain clarity.
CalcMarkGuide new CalcMark language features across lexer, parser, and interpreter layers.
cbbkrd-techExecutes detected test suites and parses pass/fail counts with coverage reports.
EsdevenimentsEnforce TypeScript type definitions in the /types directory during development and code reviews.
NotysotyGenerate unit tests for JavaScript and TypeScript with Jest, Vitest, or Mocha.
