Armed your project with Jest.

A opinionated scaffolding CLI to make your project tested by Jest and with coverage enabled.

Why

Because configure Jest and set coverage is tedious 🤕.

Just with one line cmd 🚀, everything is configured for U ❤️！

Use

For TypeScript project:

npx create-test-app --type ts

For JavaScript project:

npx create-test-app

DONE!

Files to be modified or created.

1. package.json
2. jest.config.js
3. babel.config.js
4. test/: auto generate test
5. won't modify tsconfig.json but auto mapping paths to jest's moduleNameMapper

Advanced

set coverage to 50 and and add jest transform.

npx create-test-app --type ts --coverage 50 --transform="{ vue: 'vue-jest' }"

  'transform': {
+    '^.+\\.(vue)$': 'vue-jest',
  },

How it works

Automatically armed your project with jest. You can do it manually if you don't trust this CLI.

TS

For TS. It will go through the steps:

1. Install

npm i -D jest typescript ts-jest @types/jest

2. Initialize jest.config.js

npx ts-jest config:init

3. Collect Coverage

npx jest --init

jest.config.js

module.exports = {
   preset: 'ts-jest',
   testEnvironment: "node",

+  coverageDirectory: "coverage",
+  coverageProvider: "v8",
+  coverageThreshold: {
    "global": {
      "branches": 100,
      "functions": 100,
      "lines": 100,
      "statements": 100
    }
  },
}

package.json

   "scripts": {
     "build": "tsc --declaration",
     "preversion": "npm run build",
     "postversion": "npm publish && git push && git push --tags",
-    "test": "jest"
+    "test": "jest --coverage"
   },

.gitignore

+coverage/

4. Write tests

md test && cd test && touch lite-lodash.test.ts

// lite-lodash.test.js
import { isPromise } from '../src/lib/lite-lodash'

describe('isPromise', () => {
  it('`Promise.resolve()` should be a promise', () => {
    const input = Promise.resolve();
    const actual = isPromise(input);
    const expected = true;

    expect(actual).toEqual(expected);
  });

  it('`new Promise` should be a promise', () => {
    const input = new Promise(() => {});
    const actual = isPromise(input);
    const expected = true;

    expect(actual).toEqual(expected);
  });
});

from Jest 运行 TypeScript 单测并增加覆盖率.

JS

1. Install

npm i -D jest @types/jest

All the same without npx ts-jest config:init.

Run tests

npm test

TODO

• [ ] UX improvement: auto check whether it is a TS project

Author

👤 legend80s

• Github: @legend80s

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