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
You might try
expect.fail("This should've not happenned");
or another "more readable" alternative
should.fail("This should've not happenned");
In this section looks like there is a cool idiomatic way to perform what you want:
const action = function() { yourSyncFunction() }
expect(action).to.throw(YourError)
And here there's the DSL for testing promises. (You need to install the "As promised" plugin)
yourAsyncFunction().should.be.rejectedWith(Error)