Verify that an exception is thrown using Mocha / Chai and async/await

Question

I\'m struggling to work out the best way to verify that a promise is rejected in a Mocha test while using async/await.

Here\'s an example that works, but I dislike t

Answer 1

This is my Solution for the problem .

    try {
        // here the function that i expect to will return an errror
        let walletid = await Network.submitTransaction(transaction)
    } catch (error) {
        //  assign error.message to ErrorMessage
        var ErrorMessage = error.message;
        //  catch it and  re throw it in assret.throws fn and pass the error.message as argument and assert it is the same message expected
        assert.throws(() => { throw new Error(ErrorMessage) },'This user already exists');
    }
    // here assert that ErrorMessage is Defined ; if it is not defined it means that no error occurs
    assert.isDefined(ErrorMessage);