diff --git a/src/test/e2e/globalSetup.ts b/src/test/e2e/globalSetup.ts
index 40a3e49..b6d29fd 100644
--- a/src/test/e2e/globalSetup.ts
+++ b/src/test/e2e/globalSetup.ts
@@ -1,8 +1,13 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 import { downloadAndUnzipVSCode, resolveCliArgsFromVSCodeExecutablePath } from '@vscode/test-electron';
+import { execSync } from 'child_process';
 
 export default async () => {
     const vscodePath = await downloadAndUnzipVSCode('insiders');
-    resolveCliArgsFromVSCodeExecutablePath(vscodePath);
+    const [cli, ...args] = resolveCliArgsFromVSCodeExecutablePath(vscodePath);
+    execSync(`${cli} ${args.join(' ')} --install-extension humao.rest-client`, {
+        encoding: 'utf-8',
+    });
+
 };
diff --git a/src/test/e2e/tests/validateGenerateHTTPFile.test.ts b/src/test/e2e/tests/validateGenerateHTTPFile.test.ts
new file mode 100644
index 0000000..eb464f9
--- /dev/null
+++ b/src/test/e2e/tests/validateGenerateHTTPFile.test.ts
@@ -0,0 +1,44 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+import { expect, test } from '../baseTest';
+import { RestClient, Timeout, VSCode } from '../utils/constants';
+import VscodeOperator from '../utils/vscodeOperator';
+
+test('validate Generate HTTP File', { tag: ["@26611996"] }, async ({ workbox }) => {
+    //set test timeout
+    test.setTimeout(160000);
+    await workbox.waitForTimeout(Timeout.PREPARE_TEST);
+    // wait API Center extension installed on VS Code.
+    expect(await VscodeOperator.isSideTabItemExist(workbox, "API Center")).toBeTruthy();
+    await VscodeOperator.activeSideTab(workbox, VSCode.TAB_API_CENTER, Timeout.PREPARE_EXT);
+    //expand and validate
+    await VscodeOperator.clickTreeItemChildLinkByText(workbox, "Teams Cloud - E2E Testing with TTL = 1 Days", "Teams Cloud - E2E Testing with TTL = 1 Days");
+    expect(await VscodeOperator.isTreeItemExist(workbox, "apicentertest001")).toBeTruthy();
+    await VscodeOperator.clickTreeItem(workbox, "apicentertest001");
+    expect(await VscodeOperator.isTreeItemExist(workbox, "APIs")).toBeTruthy();
+    await VscodeOperator.clickTreeItemChildLinkByText(workbox, "APIs", "APIs");
+    expect(await VscodeOperator.isTreeItemExist(workbox, "callback-example")).toBeTruthy();
+    await VscodeOperator.clickTreeItem(workbox, "callback-example");
+    expect(await VscodeOperator.isTreeItemExist(workbox, "Versions")).toBeTruthy();
+    await VscodeOperator.clickTreeItem(workbox, "Versions");
+    expect(await VscodeOperator.isTreeItemExist(workbox, "1-0-0")).toBeTruthy();
+    await VscodeOperator.clickTreeItem(workbox, "1-0-0");
+    expect(await VscodeOperator.isTreeItemExist(workbox, "Definitions")).toBeTruthy();
+    await VscodeOperator.clickTreeItem(workbox, "Definitions");
+    expect(await VscodeOperator.isTreeItemExist(workbox, "openapi")).toBeTruthy();
+    //right click on openai
+    await VscodeOperator.rightClickTreeItem(workbox, "openapi");
+    expect(await VscodeOperator.isMenuItemExist(workbox, "Generate HTTP File")).toBeTruthy();
+    await VscodeOperator.clickMenuItem(workbox, "Generate HTTP File");
+    await workbox.waitForTimeout(Timeout.LONG_WAIT);
+    //validate the http file is opened
+    expect(await VscodeOperator.isSideTabItemExist(workbox, "1-0-0-tempFile.http")).toBeTruthy();
+    // trigger command palette.
+    await VscodeOperator.execCommandInCommandPalette(workbox, RestClient.SEND_REQUEST);
+    await workbox.waitForTimeout(Timeout.PREPARE_EXT);
+    // check http result
+    const requestFrame = await VscodeOperator.getHttpRequestFrame(workbox);
+    expect(requestFrame.locator('span.hljs-number')).toContainText('200');
+    console.log("[finsish] validate Generate HTTP File test");
+});
diff --git a/src/test/e2e/utils/constants.ts b/src/test/e2e/utils/constants.ts
index 51f3714..c8aacd6 100644
--- a/src/test/e2e/utils/constants.ts
+++ b/src/test/e2e/utils/constants.ts
@@ -9,6 +9,7 @@ export class Timeout {
     public static readonly PREPARE_TEST = 5000;
     public static readonly PREPARE_EXT = 10000;
     public static readonly SHORT_WAIT = 5000;
+    public static readonly LONG_WAIT = 20000;
 }
 
 export class VSCode {
@@ -31,6 +32,8 @@ export class VSCode {
     public static readonly ENTER = "Enter";
     //toolbar
     public static readonly Toolbar = "toolbar";
+    // menu item
+    public static readonly MENU_ITEM = "menuitem";
 }
 
 export class APICenter {
@@ -52,3 +55,8 @@ export class TestENV {
     public static readonly AZURE_SUBSCRIPTION_NAME = process.env["AZURE_SUBSCRIPTION_NAME"] || "Teams Cloud - E2E Testing with TTL = 1 Days";
     public static readonly AZURE_TENANT_ID_2 = process.env["AZURE_TENANT_ID"] || "af46c703-f714-4f4c-af42-835a673c2b13";
 }
+
+export class RestClient {
+    // commands
+    public static readonly SEND_REQUEST = ">Rest Client: Send Request";
+}
diff --git a/src/test/e2e/utils/vscodeOperator.ts b/src/test/e2e/utils/vscodeOperator.ts
index e6c3715..27c0a23 100644
--- a/src/test/e2e/utils/vscodeOperator.ts
+++ b/src/test/e2e/utils/vscodeOperator.ts
@@ -76,4 +76,27 @@ export default class VscodeOperator {
         await page.getByRole(VSCode.CMD_PALETTE_LIST, { name: listItemName }).locator(VSCode.LINK).filter({ hasText: linkName }).click();
         await page.waitForTimeout(Timeout.CLICK_WAIT);
     }
+
+
+    static async rightClickTreeItem(page: Page, treeItemName: string) {
+        await page.getByRole(VSCode.TREE_ITEM, { name: treeItemName }).locator(VSCode.LINK).click({
+            button: 'right'
+        });
+        await page.waitForTimeout(Timeout.CLICK_WAIT);
+    }
+
+    static async isMenuItemExist(page: Page, menuItemName: string) {
+        return await page.getByRole(VSCode.MENU_ITEM, { name: menuItemName }).isVisible();
+    }
+
+    static async clickMenuItem(page: Page, menuItemName: string) {
+        await page.getByRole(VSCode.MENU_ITEM, { name: menuItemName }).locator("span.action-label").click();
+        await page.waitForTimeout(Timeout.PREPARE_EXT);
+    }
+
+    static async getHttpRequestFrame(page: Page) {
+        const webviewFrame = page.frameLocator(`.webview`);
+        return webviewFrame.frameLocator(`iframe[id="active-frame"]`);
+    }
+
 }