Web Reference: Nov 24, 2025 · If you’ve worked with Angular unit testing, you’ve likely encountered the frustrating error: An error was thrown in afterAll [object ErrorEvent] thrown when running ng test. This vague error message provides little context, leaving developers stuck trying to pinpoint the root cause. Dec 4, 2018 · When I run ng test command in my angular project has error, it gives an error like that. Testing your Angular application helps you check that it is working as you expect. Unit tests are crucial for catching bugs early, ensuring code quality, and facilitating safe refactoring. NOTE: This guide covers the default testing setup for new Angular CLI projects, which uses Vitest.
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