CODEWITHSUNDEEP
angulartypescriptunit-testingjasmine
Thom
Thom

Reputation: 15052

Issues handling Angular error in unit test

I am still coming up to speed on Angular. I searched and found very little. Most helpful was: How to write a test which expects an Error to be thrown in Jasmine?

Here is my issue after reading the above post.

I am unit testing a method that throws an error. I want to catch the error so that I know that the unit test was successful. Here is my function call:

        expect(function(){instance.selectMember(event);}).toThrow();

and the line generating the error:

        throw new Error('member not found: ' + member.id);

What I got was as follows

Expected function to throw an Error.

Followed by:

Failed: member not found: 42
Error: member not found: 42

So it failed because it didn't get an error, but then displayed the error???

I've also tried:

        expect(function(){instance.selectMember(event);}).toThrow(new Error('member not found: 42'));

and

        expect(function(){instance.selectMember(event);}).toThrowError('member not found: 42');

with the same results.

How do I know my unit test triggered the error correctly?

Upvotes: 0

Views: 478

Answers (1)

Ismail
Ismail

Reputation: 2818

If your method does some async work then you should have your test in a different way, like for example using fakeAsync and tick() to stub the async.

If you update your question with the method code I can give you more detailed answer.

Upvotes: 2

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