test: Add SSE support and STX by default to all Swap/Bridge tests (#41468)

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## **Description**

- Enable Smart Transactions (STX) in bridge E2E tests by default,
replacing the hardcoded opt-out in all fixtures
- Add mockSmartTransactionsForBridge — mocks STX
sentinel/fees/submit/batchStatus endpoints, forwarding raw txs to Anvil
so receipts are genuine
- Add SSE streaming support to all quote mocks (getQuoteStream) via
sseEnabled flag
- Fix mockGetTxStatus to use a distinct dest tx hash (required for
BridgeStatusController to mark bridges complete)

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## **Related issues**

Fixes:

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Test infrastructure changes alter how Swap/Bridge E2E tests execute
transactions (enabling STX by default and switching many quote mocks to
SSE streams), which may introduce CI flakiness or new mock gaps despite
being non-production code.
> 
> **Overview**
> **Swap/Bridge E2E tests now run with SSE quotes and Smart Transactions
enabled by default.** Most test suites switch to
`BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED`, update expected balances, and
consolidate shared quote-entry logic into `enterBridgeQuote`.
> 
> Bridge mocks are expanded to support both `getQuote` and
`getQuoteStream` paths, and `mockGetTxStatus` now returns a distinct
destination tx hash so bridges can reach `COMPLETE`. A new
`mockSmartTransactionsForBridge` simulates STX
sentinel/fees/submit/batchStatus, forwarding raw signed txs to the local
Anvil node to produce real receipts; fixtures/manifest flags are updated
to include STX network configs (Mainnet + Linea) and only opt out when
explicitly requested.
> 
> Also updates test data (`swap-quotes-eth-musd.json` tx `value`
formatting) and adds `tx-sentinel-linea-mainnet.api.cx.metamask.io` to
`privacy-snapshot.json`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
a7bf5c8. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: davibroc

privacy-snapshot.json

@@ -133,6 +133,7 @@
   "tron-mainnet.infura.io",
   "tx-sentinel-bsc-mainnet.api.cx.metamask.io",
   "tx-sentinel-ethereum-mainnet.api.cx.metamask.io",
+  "tx-sentinel-linea-mainnet.api.cx.metamask.io",
   "unresponsive-rpc.test",
   "unresponsive-rpc.url",
   "user-storage.api.cx.metamask.io",

test/e2e/tests/bridge/bridge-L2-tests.spec.ts

@@ -1,16 +1,20 @@
 import { Suite } from 'mocha';
 import { withFixtures } from '../../helpers';
 import { login } from '../../page-objects/flows/login.flow';
-import { DEFAULT_BRIDGE_FEATURE_FLAGS } from './constants';
+import { BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED } from './constants';
 import { bridgeTransaction, getBridgeL2Fixtures } from './bridge-test-utils';
 
 describe('Bridge tests', function (this: Suite) {
   this.timeout(120000); // Needs a higher timeout as it's a longer tests
   it('should execute bridge transactions on L2 networks', async function () {
     await withFixtures(
-      getBridgeL2Fixtures(this.test?.fullTitle(), DEFAULT_BRIDGE_FEATURE_FLAGS),
+      getBridgeL2Fixtures(
+        this.test?.fullTitle(),
+        BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
+        true,
+      ),
       async ({ driver }) => {
-        await login(driver, { expectedBalance: '$225,750.00' });
+        await login(driver, { expectedBalance: '$225,730.11' });
 
         await bridgeTransaction({
           driver,

test/e2e/tests/bridge/bridge-negative-cases.spec.ts

@@ -2,10 +2,10 @@ import { Suite } from 'mocha';
 import { withFixtures } from '../../helpers';
 import { login } from '../../page-objects/flows/login.flow';
 import HomePage from '../../page-objects/pages/home/homepage';
-import { Driver } from '../../webdriver/driver';
 import BridgeQuotePage from '../../page-objects/pages/bridge/quote-page';
 import ActivityListPage from '../../page-objects/pages/home/activity-list';
 import {
+  enterBridgeQuote,
   getBridgeNegativeCasesFixtures,
   getInsufficientFundsFixtures,
   getQuoteNegativeCasesFixtures,
@@ -14,7 +14,7 @@ import {
   GET_QUOTE_INVALID_RESPONSE,
   FAILED_SOURCE_TRANSACTION,
   FAILED_DEST_TRANSACTION,
-  DEFAULT_BRIDGE_FEATURE_FLAGS,
+  BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
 } from './constants';
 
 const DEFAULT_LOCAL_NODE_USD_BALANCE = '24.998';
@@ -24,7 +24,7 @@ describe('Bridge functionality', function (this: Suite) {
     await withFixtures(
       {
         ...getInsufficientFundsFixtures(
-          DEFAULT_BRIDGE_FEATURE_FLAGS,
+          BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
           this.test?.fullTitle(),
         ),
       },
@@ -59,7 +59,7 @@ describe('Bridge functionality', function (this: Suite) {
             statusCode: 500,
             json: 'Internal server error',
           },
-          DEFAULT_BRIDGE_FEATURE_FLAGS,
+          BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
           this.test?.fullTitle(),
         ),
       },
@@ -86,7 +86,7 @@ describe('Bridge functionality', function (this: Suite) {
             statusCode: 200,
             json: [],
           },
-          DEFAULT_BRIDGE_FEATURE_FLAGS,
+          BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
           this.test?.fullTitle(),
         ),
       },
@@ -113,7 +113,7 @@ describe('Bridge functionality', function (this: Suite) {
             statusCode: 200,
             json: GET_QUOTE_INVALID_RESPONSE,
           },
-          DEFAULT_BRIDGE_FEATURE_FLAGS,
+          BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
           this.test?.fullTitle(),
         ),
       },
@@ -141,7 +141,7 @@ describe('Bridge functionality', function (this: Suite) {
             statusCode: 500,
             json: 'Internal server error',
           },
-          DEFAULT_BRIDGE_FEATURE_FLAGS,
+          BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
           this.test?.fullTitle(),
         ),
       },
@@ -157,8 +157,8 @@ describe('Bridge functionality', function (this: Suite) {
 
         const bridgePage = await enterBridgeQuote(driver);
         await bridgePage.submitQuote();
-
         await homePage.goToActivityList();
+
         const activityList = new ActivityListPage(driver);
         await activityList.checkPendingBridgeTransactionActivity();
         await activityList.checkBridgeTransactionDetails(
@@ -180,8 +180,10 @@ describe('Bridge functionality', function (this: Suite) {
             statusCode: 200,
             json: FAILED_SOURCE_TRANSACTION,
           },
-          DEFAULT_BRIDGE_FEATURE_FLAGS,
+          BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
           this.test?.fullTitle(),
+          true,
+          { minedTx: 'reverted' },
         ),
       },
       async ({ driver, localNodes }) => {
@@ -196,7 +198,6 @@ describe('Bridge functionality', function (this: Suite) {
 
         const bridgePage = await enterBridgeQuote(driver);
         await bridgePage.submitQuote();
-
         await homePage.goToActivityList();
 
         const activityList = new ActivityListPage(driver);
@@ -220,8 +221,10 @@ describe('Bridge functionality', function (this: Suite) {
             statusCode: 200,
             json: FAILED_DEST_TRANSACTION,
           },
-          DEFAULT_BRIDGE_FEATURE_FLAGS,
+          BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
           this.test?.fullTitle(),
+          true,
+          { minedTx: 'reverted' },
         ),
       },
       async ({ driver, localNodes }) => {
@@ -236,7 +239,6 @@ describe('Bridge functionality', function (this: Suite) {
 
         const bridgePage = await enterBridgeQuote(driver);
         await bridgePage.submitQuote();
-
         await homePage.goToActivityList();
 
         const activityList = new ActivityListPage(driver);
@@ -252,16 +254,3 @@ describe('Bridge functionality', function (this: Suite) {
     );
   });
 });
-
-async function enterBridgeQuote(driver: Driver): Promise<BridgeQuotePage> {
-  const bridgePage = new BridgeQuotePage(driver);
-  await bridgePage.enterBridgeQuote({
-    amount: '1',
-    tokenFrom: 'ETH',
-    tokenTo: 'ETH',
-    fromChain: 'Ethereum',
-    toChain: 'Linea',
-  });
-
-  return bridgePage;
-}

test/e2e/tests/bridge/bridge-positive-cases.spec.ts

@@ -5,10 +5,7 @@ import HomePage from '../../page-objects/pages/home/homepage';
 import BridgeQuotePage from '../../page-objects/pages/bridge/quote-page';
 import NetworkManager from '../../page-objects/pages/network-manager';
 import TokenOverviewPage from '../../page-objects/pages/token-overview-page';
-import {
-  BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
-  DEFAULT_BRIDGE_FEATURE_FLAGS,
-} from './constants';
+import { BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED } from './constants';
 import {
   bridgeTransaction,
   checkQuoteRequestsAreNotMadeAfterTimestamp,
@@ -21,15 +18,14 @@ describe('Bridge tests', function (this: Suite) {
     await withFixtures(
       getBridgeFixtures(
         this.test?.fullTitle(),
-        DEFAULT_BRIDGE_FEATURE_FLAGS,
+        BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
         false,
       ),
       async ({ driver }) => {
         // the balance has been fixed now , we show native balance when currency controller is set
         await login(driver, { expectedBalance: '$225,730.11' });
 
         const homePage = new HomePage(driver);
-
         await bridgeTransaction({
           driver,
           quote: {
@@ -94,7 +90,7 @@ describe('Bridge tests', function (this: Suite) {
     await withFixtures(
       getBridgeFixtures(
         this.test?.fullTitle(),
-        DEFAULT_BRIDGE_FEATURE_FLAGS,
+        BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
         false,
       ),
       async ({ driver, mockedEndpoint }) => {
@@ -179,7 +175,7 @@ describe('Bridge tests', function (this: Suite) {
     await withFixtures(
       getBridgeFixtures(
         this.test?.fullTitle(),
-        DEFAULT_BRIDGE_FEATURE_FLAGS,
+        BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
         false,
       ),
       async ({ driver }) => {
@@ -209,7 +205,7 @@ describe('Bridge tests', function (this: Suite) {
     await withFixtures(
       getBridgeFixtures(
         this.test?.fullTitle(),
-        DEFAULT_BRIDGE_FEATURE_FLAGS,
+        BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
         false,
       ),
       async ({ driver }) => {
@@ -242,7 +238,7 @@ describe('Bridge tests', function (this: Suite) {
     await withFixtures(
       getBridgeFixtures(
         this.test?.fullTitle(),
-        DEFAULT_BRIDGE_FEATURE_FLAGS,
+        BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
         false,
       ),
       async ({ driver }) => {
@@ -279,7 +275,7 @@ describe('Bridge tests', function (this: Suite) {
     await withFixtures(
       getBridgeFixtures(
         this.test?.fullTitle(),
-        DEFAULT_BRIDGE_FEATURE_FLAGS,
+        BRIDGE_FEATURE_FLAGS_WITH_SSE_ENABLED,
         false,
       ),
       async ({ driver }) => {