Am I using expect().toThrow incorrectly?

[Jon Prins]

Hi there,

I cannot for the life of me get this test to pass. I may be
using .toThrow improperly... but I'm not sure, as there isn't an
example with a corresponding code snippet. Any help would be much
appreciated!

In edited form:

function myFunctionToTest (parameter) {
/* do some stuff, and if parameter is out of bounds */
throw new TypeError("Invalid parameter")
}


My test, then, looks a little like this:

expect(myFunctionToTest(invalidParamter)).toThrow()

and I've tried just about everything as a parameter to toThrow. new
TypeError. New TypeError("Invalid parameter"). "Error: TypeError:
Invalid parameter." (what chrome logs when you throw the error).

It always fails because of the thrown error - which is what I'm
testing to make sure happens!

Any suggestions on how to do this properly would be much loved :)

Thanks,
Jon

[Christian Williams]

You need to wrap the whole call inside an anonymous function:

> expect(function() {myFunctionToTest(invalidParamter)}).toThrow()

--X [typos courtesy of my iPhone]

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[Jonathan Prins]

Aha! Fantastic, works like a charm.