AssertionError: expected 2 to be 1 // Object.is equality - Expected + Received - 1 + 2 ❯ Timeout._onTimeout __tests__/performance.test.ts:166:48 ❯ listOnTimeout node:internal/timers:581:17 ❯ processTimers node:internal/timers:519:7 This error originated in "__tests__/performance.test.ts" test file. It doesn't mean the error was thrown inside the file itself, but while it was running.