test: rerun dev server (#3824)

Author: alexander-akait

test/e2e/__snapshots__/api.test.js.snap.webpack4

@@ -1,5 +1,27 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`API should work and allow to rerun dev server multiple times: console messages 1`] = `
+Array [
+  "[HMR] Waiting for update signal from WDS...",
+  "Hey.",
+  "[webpack-dev-server] Hot Module Replacement enabled.",
+  "[webpack-dev-server] Live Reloading enabled.",
+]
+`;
+
+exports[`API should work and allow to rerun dev server multiple times: console messages 2`] = `
+Array [
+  "[HMR] Waiting for update signal from WDS...",
+  "Hey.",
+  "[webpack-dev-server] Hot Module Replacement enabled.",
+  "[webpack-dev-server] Live Reloading enabled.",
+]
+`;
+
+exports[`API should work and allow to rerun dev server multiple times: page errors 1`] = `Array []`;
+
+exports[`API should work and allow to rerun dev server multiple times: page errors 2`] = `Array []`;
+
 exports[`API should work when using configured manually: console messages 1`] = `
 Array [
   "[HMR] Waiting for update signal from WDS...",

test/e2e/__snapshots__/api.test.js.snap.webpack5

@@ -1,5 +1,27 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`API should work and allow to rerun dev server multiple times: console messages 1`] = `
+Array [
+  "[HMR] Waiting for update signal from WDS...",
+  "Hey.",
+  "[webpack-dev-server] Hot Module Replacement enabled.",
+  "[webpack-dev-server] Live Reloading enabled.",
+]
+`;
+
+exports[`API should work and allow to rerun dev server multiple times: console messages 2`] = `
+Array [
+  "[HMR] Waiting for update signal from WDS...",
+  "Hey.",
+  "[webpack-dev-server] Hot Module Replacement enabled.",
+  "[webpack-dev-server] Live Reloading enabled.",
+]
+`;
+
+exports[`API should work and allow to rerun dev server multiple times: page errors 1`] = `Array []`;
+
+exports[`API should work and allow to rerun dev server multiple times: page errors 2`] = `Array []`;
+
 exports[`API should work when using configured manually: console messages 1`] = `
 Array [
   "[HMR] Waiting for update signal from WDS...",

test/e2e/api.test.js

@@ -123,6 +123,63 @@ describe("API", () => {
     await server.stop();
   });
 
+  it(`should work and allow to rerun dev server multiple times`, async () => {
+    const compiler = webpack(config);
+    const server = new Server({ port }, compiler);
+
+    await server.start();
+
+    const { page: firstPage, browser } = await runBrowser();
+
+    const firstPageErrors = [];
+    const firstConsoleMessages = [];
+
+    firstPage
+      .on("console", (message) => {
+        firstConsoleMessages.push(message);
+      })
+      .on("pageerror", (error) => {
+        firstPageErrors.push(error);
+      });
+
+    await firstPage.goto(`http://127.0.0.1:${port}/main`, {
+      waitUntil: "networkidle0",
+    });
+
+    expect(
+      firstConsoleMessages.map((message) => message.text())
+    ).toMatchSnapshot("console messages");
+    expect(firstPageErrors).toMatchSnapshot("page errors");
+
+    await server.stop();
+    await server.start();
+
+    const secondPage = await browser.newPage();
+
+    const secondPageErrors = [];
+    const secondConsoleMessages = [];
+
+    secondPage
+      .on("console", (message) => {
+        secondConsoleMessages.push(message);
+      })
+      .on("pageerror", (error) => {
+        secondPageErrors.push(error);
+      });
+
+    await secondPage.goto(`http://127.0.0.1:${port}/main`, {
+      waitUntil: "networkidle0",
+    });
+
+    expect(
+      secondConsoleMessages.map((message) => message.text())
+    ).toMatchSnapshot("console messages");
+    expect(secondPageErrors).toMatchSnapshot("page errors");
+
+    await browser.close();
+    await server.stop();
+  });
+
   it("should work with deprecated API ('listen' and `close` methods)", async () => {
     const compiler = webpack(config);
     const devServerOptions = { port };