superset-frontend/packages/generator-superset/test/app.test.js

const path = require('path');
const assert = require('yeoman-assert');
const helpers = require('yeoman-test');

describe('generator-superset:app', () => {
  let dir;

  beforeAll(() => {
    dir = process.cwd();

    return helpers.run(path.join(__dirname, '../generators/app')).withPrompts({
      subgenerator: 'package',
      name: 'my-package',
    });
  });

  /*
   * Change working directory back to original working directory
   * after the test has completed.
   * yeoman tests switch to tmp directory and write files there.
   * Usually this is fine for solo package.
   * However, for a monorepo like this one,
   * it made jest confuses with current directory
   * (being in tmp directory instead of superset-ui root)
   * and interferes with other tests in sibling packages
   * that are run after the yeoman tests.
   */
  afterAll(() => {
    process.chdir(dir);
  });

  it('creates files', () => {
    assert.file(['package.json', 'README.md', 'src/index.ts', 'test/index.test.ts']);
  });
});