Merge pull request Expensify#68768 from Expensify/andrew-perf-tests

[NO QA] Add an enhanced mock for ReportUtils to fix tests

Author: tgolen

tests/perf-test/OptimisticReportNames.perf-test.ts

@@ -13,7 +13,10 @@ import waitForBatchedUpdates from '../utils/waitForBatchedUpdates';
 
 // Mock dependencies
 jest.mock('@libs/ReportUtils', () => ({
+    // jest.requireActual is necessary to include multi-layered module imports (eg. Report.ts has processReportIDDeeplink() which uses parseReportRouteParams() imported from getReportIDFromUrl.ts)
+    // Without jest.requireActual, parseReportRouteParams would be undefined, causing the test to fail.
     ...jest.requireActual<typeof ReportUtils>('@libs/ReportUtils'),
+    // These methods are mocked below in the beforeAll function to return specific values
     isExpenseReport: jest.fn(),
     getTitleReportField: jest.fn(),
 }));