[test] Exclude repository root from assertions (#35361)

scripts/jest/setupTests.js

@@ -6,6 +6,7 @@ const {
   resetAllUnexpectedConsoleCalls,
   patchConsoleMethods,
 } = require('internal-test-utils/consoleMock');
+const path = require('path');
 
 if (process.env.REACT_CLASS_EQUIVALENCE_TEST) {
   // Inside the class equivalence tester, we have a custom environment, let's
@@ -18,6 +19,9 @@ if (process.env.REACT_CLASS_EQUIVALENCE_TEST) {
   const spyOn = jest.spyOn;
   const noop = jest.fn;
 
+  // Can be used to normalize paths in stackframes
+  global.__REACT_ROOT_PATH_TEST__ = path.resolve(__dirname, '../..');
+
   // Spying on console methods in production builds can mask errors.
   // This is why we added an explicit spyOnDev() helper.
   // It's too easy to accidentally use the more familiar spyOn() helper though,