This package provides a Jest preset configuration, used internally at Digita to adopt a uniform testing habit.

In the root of your (mono)repo, install @digita-ai/jest-config as a development dependency. From NPM v7 onwards,, this will automatically add the following peer dependencies as well (if you use an earlier version, install these yourself).

• jest
• jest-extended
• jest-mock-extended
• jest-coverage-thresholds-bumper
• @types/jest
• ts-jest

It will also suggest the following optional dependencies.

• @testing-library/jest-dom
• jest-fetch-mock

When working in monorepo, install jest and jest-coverage-thresholds-bumper as development dependencies in each subrepo as well.

In each package.json, add the following jest object.

"jest": {
    "coverageThreshold": {
        "global": {
            "branches": 0,
            "functions": 0,
            "lines": 0,
            "statements": 0
        }
    },
    "displayName": "core",
    "preset": "@digita-ai/jest-config",
    "rootDir": "lib"
}

Coverage thresholds will automatically be raised when running tests. Optionally, you can tell Jest to look for tests in multiple directories by setting and extending the "roots": [ "<rootDir>" ] list. You can also switch testing environment between node and jsdom with "testEnvironment": "node", and set configuration for these environments with "testEnvironmentOptions": { /* ... */ }.

When using git hooks in a monorepo, you might want to run Jest from the root node_modules of your repository, without having the test search for relative paths in the wrong place. To prevent this, add the following jest object to the root package.json, pointing to all packages where you wish to run Jest.

"jest": {
    "preset": "@digita-ai/jest-config",
    "projects": [
        "./packages/*/package.json"
    ]
}