Jest Config to declare a test pyramid based on "projects"

jest.pyramid.config.js

// Example of test pyramid using jest

// Basic usage:
// jest --selectProjects 'unit tests' 
// Assumes that you organize tests under __${type}_tests__/**/*.js
// 

const path = require('path');

const correctPath = value => path.resolve(__dirname, value || '');

const testOfType = (name, config = {}) => ({
  displayName: {
    name: `${name} tests`,
    color: `green`,
  },
  collectCoverage: true,
  moduleNameMapper: {
    // rename @my-project to the import path of your module
    //'@my-project/(.*)': '<rootDir>/$1', // use this if your files are not under "src"
    '@my-project': '<rootDir>/src'
  },

  testMatch: [`__${name}_tests__/*.test.js`, `**/__${name}_tests__/*.test.js`].map(correctPath),
  coveragePathIgnorePatterns: ['/node_modules/', `.*__${name}_tests__.*`],
  testPathIgnorePatterns: ['/node_modules/'],
  ...config,
});

const config = {
  rootDir: correctPath(),
  passWithNoTests: true,
  projects: [
    
    testOfType('unit', {
      resetMocks: true,
      coveragePathIgnorePatterns: ['/node_modules/', '.*__unit_tests__.*', '.*__mocks__.*'],
    }),
    testOfType('functional'),

  ],
};
module.exports = config;