Testing for errors thrown in Mocha [duplicate]

You’re not passing your function to assert.throws() the right way.

The assert.throws() function expects a function as its first parameter. In your code, you are invoking iThrowError and passing its return value when calling assert.throws().

Basically, changing this:

assert.throws(iThrowError(), Error, "Error thrown");

to this:

assert.throws(iThrowError, Error, "Error thrown");

should solve your problem.

With args:

assert.throws(() => { iThrowError(args) }, Error);

or

assert.throws(function() { iThrowError(args) }, Error, /Error thrown/);