Asserting an exception in QUnit

Question

I am working on a unit test that is testing a generated parser code from a grammar. ( generated via PegJS) Im almost finished with most of the cases that are possible. There are 2-3 of them left and they are expected to throw an exception but i can't seem to figure out how to assert an exception.

(function () {

    "use strict";

    QUnit.module('durationTests');

    QUnit.test('durationParseTest', function (assert) {

        var dp1 = DurationParser.parse(new String('')); //this is the one that is expected to throw exception 
        var dp2 = DurationParser.parse(new String('P'));
        var dp3 = DurationParser.parse(new String('P13MT2H'));
        var dp4 = DurationParser.parse(new String('P2Y6M'));

        assert.deepEqual(dp2,[]);
        assert.deepEqual(dp3, [
            {
                "type": "M",
                "val": 13
            },
            {
                "type": "T"
            },
            {
                "type": "H",
                "val": 2
            }
        ]);

there are many other cases but I included only these two to show how I tested them. They are working just fine right now.

The thing I don't get about QUnit throw assertion is that I don't know how to give the assertion this spesific parse function. Any help is appreciated.

Edit: I tried many of the suggested ways in QUnit website but still can't figure out how to test that spesific exception properly.

Glad you got this on your own! You should add an answer below to your own question, and then accept it! — Jordan Kasper
– Jordan Kasper, Commented Dec 17, 2019 at 19:32

Poyraz Kürkçüoğlu · Accepted Answer · 2020-01-02 10:24:47Z

3

I managed to test the exception succesfully , im sharing the answer if anybody is interested

QUnit.test("Invalid string input throws SyntaxError", function (assert) {
        assert.throws(
            function () {
                DurationParser.parse(new String(''));
            },
            function (error) {
                return error.name === "SyntaxError";
            }
        );
    });

QUnit website was not helpful at all, I figured it out by just trying different variations of this syntax.

answered Jan 2, 2020 at 10:24

Poyraz Kürkçüoğlu

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