In JUnit you can fail a test by doing:
fail(Exception not thrown);
What's the best way to achieve the same using Chai.js?
There are many ways to fake a failure – like the assert.fail() mentioned by @DmytroShevchenko –, but usually, it is possible to avoid these crutches and express the intent of the test in a better way, which will lead to more meaningful messages if the tests fail.
For instance, if you expect a exception to be thrown, why not say so directly:
expect( function () {
// do stuff here which you expect to throw an exception
} ).to.throw( Error );
As you can see, when testing exceptions, you have to wrap your code in an anonymous function.
Of course, you can refine the test by checking for a more specific error type, expected error message etc. See .throw in the Chai docs for more.
