feat(webkit): add page back/forward commands (#144)

src/webkit/Page.ts

@@ -267,6 +267,24 @@ export class Page extends EventEmitter {
     return response;
   }
 
+  async goBack(): Promise<network.Response | null> {
+    return await this._go('Page.goBack');
+  }
+
+  async goForward(): Promise<network.Response | null> {
+    return await this._go('Page.goForward');
+  }
+
+  async _go<T extends keyof Protocol.CommandParameters>(command: T): Promise<network.Response | null> {
+    const [response, error] = await Promise.all([
+      this.waitForNavigation(),
+      this._session.send(command).then(() => null).catch(e => e),
+    ]);
+    if (error)
+      return null;
+    return response;
+  }
+
   async waitForNavigation(): Promise<network.Response | null> {
     return await this._frameManager.mainFrame().waitForNavigation();
   }

test/navigation.spec.js

@@ -466,7 +466,7 @@ module.exports.addTests = function({testRunner, expect, playwright, FFOX, CHROME
       response = await page.goForward();
       expect(response).toBe(null);
     });
-    it.skip(WEBKIT)('should work with HistoryAPI', async({page, server}) => {
+    it('should work with HistoryAPI', async({page, server}) => {
       await page.goto(server.EMPTY_PAGE);
       await page.evaluate(() => {
         history.pushState({}, '', '/first.html');