Testing truthy / falsy values with assert/expect

when I write tests I often use such constructions with assert

 try {
   await asyncFunction(); // expect error
   assert(false) // to make 100% fail
 } catch (err) {
   assert(err) // means 'assert(true) 
 }

Now I need to use "expect" from chai lib and I don’t know how to write exactly the same test with ‘expect’ syntax

>Solution :

You might try

expect.fail("This should've not happenned");

or another "more readable" alternative

should.fail("This should've not happenned");

Chai docs

In this section looks like there is a cool idiomatic way to perform what you want:

const action = async function() { await asyncFunction() }
expect(action).to.throw(YourError)