Test for expected failure in Mocha

Question

Using Mocha, I am attempting to test whether a constructor throws an error. I haven\'t been able to do this using the expect syntax, so I\'d like to do the following:

<

Answer 1

With Chai throw (ES2016)

http://chaijs.com/api/bdd/#method_throw

For clarity... This works

it('Should fail if ...', done => {
    let ret = () => {
        MyModule.myFunction(myArg);
    };
    expect(ret).to.throw();
    done();
});

This doesn't work

it('Should fail if ...', done => {
    let ret = MyModule.myFunction(myArg);
    expect(ret).to.throw();
    done();
});