Locating the source and reason behind the [object ErrorEvent] being triggered

I'm facing an issue where one of my tests is failing and the log is not providing any useful information, apart from indicating which test failed...

LoginComponent should display username & password error message and not call login when passed nothing FAILED
    [object ErrorEvent] thrown
    [object ErrorEvent] thrown

Is there a way to track down the root cause of this error?

I tried testing with ng test --source-map=false/true but it didn't make any difference.

When I ran the test again with --watch to see if I could access the Chrome console for more details, it mentioned that form.reset is not a function. I commented out that line, yet I continue to see the same error in the log: [object ErrorEvent] thrown from that same test. However, now the Karma Chrome window does not show the form.reset error, instead displaying: 

Uncaught Error: The requested path contains undefined segment at index 0

javascriptangulartypescript

Answer №1

Here are two possible solutions:

  • To disable source mapping in your tests, use the command ng test --source-mapping=false

  • Alternatively, open your browser's console to view the actual error message.

Answer №2

After reviewing the Karma console, I came across a helpful error message: 

Uncaught Error: The requested path contains undefined segment at index 0
.

Upon further investigation, I discovered that the issue stemmed from my routing to this.returnUrl, which was being set as undefined. To resolve this, I initialized it in my declaration: returnUrl: string = '';. With this adjustment, the error was eliminated and the routing functioned correctly.

While I am uncertain if this is the definitive solution, it serves as a temporary workaround for now.

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