fix: use setup hook to init the environment

In jest v28 it seems the constructor doesn't work fine, so I've moved the init of jsdom to the setup hook instead.

__tests__/environment.test.js

@@ -13,6 +13,7 @@ const MockEnvironment = function () {
 
 const MockDefaultEnvironment = jest.fn(MockEnvironment);
 MockDefaultEnvironment.prototype.teardown = jest.fn();
+MockDefaultEnvironment.prototype.setup = jest.fn();
 
 describe("using jest-environment-jsdom", () => {
   let jestEnvironmentJSDOMGlobal;
@@ -39,9 +40,11 @@ describe("using jest-environment-jsdom", () => {
     expect(mockJestEnvironmentJsdom).toHaveBeenCalledTimes(1);
   });
 
-  test("should set jsdom on its global object", () => {
+  test("should set jsdom on its global object", async () => {
     const environment = new jestEnvironmentJSDOMGlobal();
 
+    await environment.setup()
+
     expect(environment.global.jsdom).toBe(mockDom);
   });
 
@@ -50,6 +53,6 @@ describe("using jest-environment-jsdom", () => {
 
     environment.teardown();
 
-    expect(environment.global.jsdom).toBe(null);
+    expect(environment.global.jsdom).toBe(undefined);
   });
 });

environment.js

@@ -6,15 +6,13 @@ if (pkg.default) {
 }
 
 module.exports = class JSDOMEnvironmentGlobal extends JSDOMEnvironment {
-  constructor(config, options) {
-    super(config, options);
-
+  async setup() {
+    await super.setup();
     this.global.jsdom = this.dom;
   }
 
-  teardown() {
-    this.global.jsdom = null;
-
-    return super.teardown();
+  async teardown() {
+    this.global.jsdom = undefined;
+    await super.teardown();
   }
 };