Add delay in test to allow Alice to fetch Bob's device keys (#28668)

* add delay in test to allow Alice to fetch Bob's device keys

* wait until we see bob's device, rather than hard-coding a timeout

* Fix comment

Co-authored-by: Florian Duros <[email protected]>

* fix lint

---------

Co-authored-by: Florian Duros <[email protected]>

playwright/e2e/crypto/user-verification.spec.ts

@@ -8,6 +8,7 @@ Please see LICENSE files in the repository root for full details.
 
 import { type Preset, type Visibility } from "matrix-js-sdk/src/matrix";
 
+import type { Page } from "@playwright/test";
 import { test, expect } from "../../element-web-test";
 import { doTwoWaySasVerification, awaitVerifier } from "./utils";
 import { Client } from "../../pages/client";
@@ -38,6 +39,8 @@ test.describe("User verification", () => {
         toasts,
         room: { roomId: dmRoomId },
     }) => {
+        await waitForDeviceKeys(page);
+
         // once Alice has joined, Bob starts the verification
         const bobVerificationRequest = await bob.evaluateHandle(
             async (client, { dmRoomId, aliceCredentials }) => {
@@ -87,6 +90,8 @@ test.describe("User verification", () => {
         toasts,
         room: { roomId: dmRoomId },
     }) => {
+        await waitForDeviceKeys(page);
+
         // once Alice has joined, Bob starts the verification
         const bobVerificationRequest = await bob.evaluateHandle(
             async (client, { dmRoomId, aliceCredentials }) => {
@@ -149,3 +154,15 @@ async function createDMRoom(client: Client, userId: string): Promise<string> {
         ],
     });
 }
+
+/**
+ * Wait until we get the other user's device keys.
+ * In newer rust-crypto versions, the verification request will be ignored if we
+ * don't have the sender's device keys.
+ */
+async function waitForDeviceKeys(page: Page): Promise<void> {
+    await expect(page.getByRole("button", { name: "Avatar" })).toBeVisible();
+    const avatar = await page.getByRole("button", { name: "Avatar" });
+    await avatar.click();
+    await expect(page.getByText("1 session")).toBeVisible();
+}