Jest

• Native support for ES modules
• Issue Comment: ES Modules

    '^.+\\.jsx?$': ['babel-jest', {configFile: './babel.config.jest.js'}],

• Jest Configuration

默认规则: [ "**/**tests**/**/_.[jt]s?(x)", "\*\*/?(_.)+(spec|test).[jt]s?(x)" ]

• Visual Testing
  • americanexpress/jest-image-snapshot

npm i --save-dev jest babel-jest @babel/preset-env

transform: {
"^.+\\.jsx?$": "babel-jest"
},

{
  "presets": ["@babel/preset-env"]
}

yarn add --dev jest ts-jest @types/jest

/**
 * @jest-environment node
 */

jest.config.js

const { pathsToModuleNameMapper } = require('ts-jest/utils');
const { compilerOptions } = require('./tsconfig');

module.exports = {
  setupFiles: ['<rootDir>/jest.setup.js'],
  transform: {
    '^.+\\.(ts|tsx)$': 'ts-jest',
  },
  globals: {
    'ts-jest': {
      // tsConfig: 'tsconfig.jest.json',
      tsConfig: 'tsconfig.json',
    },
  },
  moduleNameMapper: pathsToModuleNameMapper(compilerOptions.paths, { prefix: '<rootDir>/' }),
};

jest.setup.js

require('dotenv').config();

Cannot use import statement outside a module