react: typescript jest && enzyme

module.exports = {
  "roots": [
    "<rootDir>/src"
  ],
  "transform": {
    "^.+\\.tsx?$": "ts-jest"
  },
  "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",
  "moduleFileExtensions": [
    "ts",
    "tsx",
    "js",
    "jsx",
    "json",
    "node"
  ]
}

export const sum = (...args) => args.reduce((acc, val) => acc+val, 0)

import {sum } from "./foo";

test("basic", () => {expect(sum()).toBe(0)})

test("basic begin", () => {expect(sum(1,2,3)).toBe(6)})

import { configure } from ‘enzyme‘;
import * as Adapter from ‘enzyme-adapter-react-16‘;

configure({ adapter: new Adapter() });

module.exports = {
  "roots": [
    "<rootDir>/src"
  ],
  "setupFileAfterEnv": ["<rootDir>/setup-test.ts"]  
  "transform": {
    "^.+\\.tsx?$": "ts-jest"
  },
  "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",
  "snapshotSerializers": ["enzyme-to-json/serializer"],
  "moduleFileExtensions": [
    "ts",
    "tsx",
    "js",
    "jsx",
    "json",
    "node"
  ]
}