go-types/test/isNullTest.js

Type-checking utilities for JavaScript

"use strict";

var assert = require("chai").assert;
var isNull = require("../src/isNull");

suite("#isNull", function () {

    test("null", function () {
        assert.equal(isNull(null), true);
    });

    test("not null", function () {
        assert.equal(isNull(), false);
        assert.equal(isNull(undefined), false);
        assert.equal(isNull(0), false);
        assert.equal(isNull(false), false);
        assert.equal(isNull(""), false);
        assert.equal(isNull(NaN), false);
        assert.equal(isNull({}), false);
        assert.equal(isNull([]), false);
        assert.equal(isNull(function () {}), false);
    });
});