Testing Infrastructure in TypeScript and Jest

This repository is set up for testing with Jest (ts-jest to be precise), automated through npm.

Note how Jest is set up in package.json: It adds development dependencies for jest, ts-jest and @types/jest (all three needed for Jest in TypeScript). It also adds a test script to tell npm what to execute with npm test.

Finally jest.config.js indicates to Jest where to find the tests.

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You will likely want to explore IDE integration for test execution and coverage in your IDE, but also ensure that tests still execute with npm in a Continuous Integration environment (e.g. github actions).

The following commands might be useful:

• npm install install all dependencies, including TypeScript and Jest.
• npm test runs jest and prints a coverage report. It also creates a html report in coverage/lcov-report/index.html
• npx jest --watch --collect-coverage runs Jest from the command line with extra arguments, here to continue watching for changes (will rerun tests immediately when changes in files are detected) and reporting coverage