feat: Add E2E tests (#4)

tests/env-ts.ts

@@ -0,0 +1,50 @@
+import NodeEnvironment from 'jest-environment-node';
+import { Server, createServer } from 'http';
+import getPort from 'get-port';
+import webpack from 'webpack';
+import path from 'path';
+import express from 'express';
+import createConfig from '../webpack.config';
+
+const build = () => new Promise<Server>(async (resolve, reject) => {
+  const config = await createConfig({
+    test: true,
+  });
+  const port = await getPort();
+  const bundler = webpack(config);
+  bundler.run((err, stats) => {
+    if (err) {
+      return reject(err);
+    } else if (stats.hasErrors()) {
+      return reject(new Error('Webpack errors'));
+    }
+    const app = express();
+    app.use(express.static(path.join(__dirname, '..', 'dist')));
+    const server = createServer(app);
+    const listener = server.listen(port, '127.0.0.1', () => {
+      resolve(listener);
+    });
+  });
+});
+
+class CustomEnvironment extends NodeEnvironment {
+  private _server?: Server;
+
+  constructor(config: any) {
+    super(config);
+  }
+
+  async setup() {
+    await super.setup();
+    this._server = await build();
+    const address: any = this._server?.address();
+    this.global.testUrl = `http://${address.address}:${address.port}`
+  }
+
+  async teardown() {
+    await super.teardown();
+    this._server?.close();
+  }
+}
+
+module.exports = CustomEnvironment;