Web Reference: Dec 28, 2016 · I am trying to write unit tests for my API service but have some trouble catching HTTP errors. I am following this guide along with the Angular2 docs since the guide is (slightly) out of date in some minor areas. 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. If you neglect to declare them, the Angular compiler won't recognize the , , and tags in the App template and will throw an error.
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