feat: Add comprehensive Bridge integration tests

app/components/UI/Bridge/testUtils/index.ts

@@ -1,10 +1,13 @@
 import {
   type BridgeControllerState,
   getDefaultBridgeControllerState,
+  type QuoteResponse,
+  RequestStatus,
 } from '@metamask/bridge-controller';
 import { initialState } from '../_mocks_/initialState';
 import { mockBridgeReducerState } from '../_mocks_/bridgeReducerState';
 import type { BridgeState } from '../../../../core/redux/slices/bridge';
+import { Hex } from '@metamask/utils';
 
 type BridgeControllerStateOverride = Partial<BridgeControllerState>;
 
@@ -50,3 +53,61 @@ export const createBridgeTestState = (
     },
   };
 };
+
+/**
+ * Creates mock quote responses for testing external provider scenarios
+ */
+export const createMockQuoteResponse = (overrides: Partial<QuoteResponse> = {}): QuoteResponse => ({
+  quote: {
+    destTokenAmount: '1000000',
+    bridgePriceData: { priceImpact: -0.002 },
+    ...overrides.quote,
+  },
+  estimatedProcessingTimeInSeconds: 60,
+  totalNetworkFee: {
+    amount: '0.01',
+    valueInCurrency: '10',
+  },
+  ...overrides,
+} as QuoteResponse);
+
+/**
+ * Creates mock bridge controller state for error scenarios
+ */
+export const createMockErrorState = (
+  errorMessage: string,
+  status: RequestStatus = RequestStatus.LOADING,
+): Partial<BridgeControllerState> => ({
+  quotes: [],
+  quotesLoadingStatus: status,
+  quoteFetchError: errorMessage,
+  quotesLastFetched: null,
+});
+
+/**
+ * Creates mock bridge controller state for timeout scenarios
+ */
+export const createMockTimeoutState = (
+  lastFetched: number | null = null,
+  refreshCount: number = 0,
+): Partial<BridgeControllerState> => ({
+  quotesLastFetched: lastFetched,
+  quotesRefreshCount: refreshCount,
+  quotesLoadingStatus: RequestStatus.FETCHED,
+});
+
+/**
+ * Creates mock token for testing
+ */
+export const createMockToken = (
+  symbol: string,
+  chainId: Hex,
+  address: string,
+  decimals: number = 18,
+) => ({
+  address,
+  chainId,
+  decimals,
+  symbol,
+  name: symbol,
+});