test: mock accounts v4 transactions endpoint

tests/api-mocking/MockServerE2E.ts

@@ -14,6 +14,7 @@ import {
   findMatchingPostEvent,
   processPostRequestBody,
   setupAccountsV2SupportedNetworksMock,
+  setupAccountsV4TransactionsMock,
 } from './helpers/mockHelpers.ts';
 import { getLocalHost } from '../framework/fixtures/FixtureUtils.ts';
 import PortManager, { ResourceType } from '../framework/PortManager.ts';
@@ -298,6 +299,7 @@ export default class MockServerE2E implements Resource {
     }
 
     await setupAccountsV2SupportedNetworksMock(this._server);
+    await setupAccountsV4TransactionsMock(this._server);
 
     await this._server
       .forAnyRequest()

tests/api-mocking/helpers/mockHelpers.ts

@@ -463,6 +463,24 @@ export async function setupAccountsV2SupportedNetworksMock(
   });
 }
 
+/**
+ * Registers a default empty history response for Accounts API v4 transactions.
+ */
+export async function setupAccountsV4TransactionsMock(server: Mockttp) {
+  await setupMockRequest(server, {
+    requestMethod: 'GET',
+    url: /^https:\/\/accounts\.api\.cx\.metamask\.io\/v4\/multiaccount\/transactions(\?.*)?$/,
+    response: {
+      data: [],
+      pageInfo: {
+        count: 0,
+        hasNextPage: false,
+      },
+    },
+    responseCode: 200,
+  });
+}
+
 export interface SeenProxiedRequest {
   method: string;
   proxiedUrl: string;