add test environement esm e2e test

e2e/__tests__/testEnvironmentEsm.test.ts

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import {tmpdir} from 'os';
+import * as path from 'path';
+import * as fs from 'graceful-fs';
+import {onNodeVersions} from '@jest/test-utils';
+import {cleanup} from '../Utils';
+import runJest from '../runJest';
+
+const DIR = tmpdir() + '/jest-test-environment-esm';
+
+beforeEach(() => cleanup(DIR));
+afterAll(() => cleanup(DIR));
+
+onNodeVersions('^12.16.0 || >=13.7.0', () => {
+  it('triggers setup/teardown hooks', () => {
+    const testDir = path.resolve(
+      __dirname,
+      '..',
+      'test-environment-esm',
+      '__tests__',
+    );
+    const testFile = path.join(testDir, 'custom.test.js');
+
+    const result = runJest('test-environment-esm', [], {
+      nodeOptions: '--experimental-vm-modules --no-warnings',
+    });
+    expect(result.exitCode).toBe(0);
+    expect(result.stdout).toContain(`TestEnvironment.setup: ${testFile}`);
+
+    const teardown = fs.readFileSync(DIR + '/teardown', 'utf8');
+    expect(teardown).toBe('teardown');
+  });
+});

e2e/test-environment-esm/TestEnvironment.mjs

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+'use strict';
+
+import os from 'os';
+import fs from 'graceful-fs';
+import JSDOMEnvironment from 'jest-environment-jsdom';
+import {createDirectory} from 'jest-util';
+
+const DIR = os.tmpdir() + '/jest-test-environment-esm';
+
+export default class TestEnvironment extends JSDOMEnvironment {
+  constructor(config, context) {
+    super(config, context);
+    this.context = context;
+  }
+
+  setup() {
+    console.info('TestEnvironment.setup:', this.context.testPath);
+    return super.setup().then(() => {
+      this.global.setup = 'setup';
+    });
+  }
+
+  teardown() {
+    return super.teardown().then(() => {
+      createDirectory(DIR);
+      fs.writeFileSync(DIR + '/teardown', 'teardown');
+    });
+  }
+
+  getVmContext() {
+    return super.getVmContext();
+  }
+}

e2e/test-environment-esm/__tests__/custom.test.js

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ */
+'use strict';
+/* eslint-env browser*/
+
+test('setup', () => {
+  expect(global.setup).toBe('setup');
+});

e2e/test-environment-esm/package.json

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+{
+  "type": "module",
+  "jest": {
+    "testEnvironment": "./TestEnvironment.mjs"
+  }
+}