go-types/test/isIntegerTest.js

Type-checking utilities for JavaScript

"use strict";

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


suite("#isInteger", function () {

    test("true", function () {
        assert.equal(isInteger(0), true);
        assert.equal(isInteger(1.0), true);
        assert.equal(isInteger(Number.MIN_SAFE_INTEGER), true);
        assert.equal(isInteger(Number.MAX_SAFE_INTEGER), true);
        assert.equal(isInteger(new Number(1)), true);
    });

    test("false", function () {
        assert.equal(isInteger(Number.MIN_VALUE), false);
        assert.equal(isInteger(Number.MAX_VALUE), true);
        assert.equal(isInteger(Number.POSITIVE_INFINITY), false);
        assert.equal(isInteger(Number.NEGATIVE_INFINITY), false);
        assert.equal(isInteger(0.001), false);
        assert.equal(isInteger("0"), false);
        assert.equal(isInteger(Number.NaN), false);
        assert.equal(isInteger(null), false);

        // these tests will fail due to the precision limitation of JavaScript numbers
//                assert.equal(isInteger(0.00000000001), false);
//                assert.equal(isInteger(123456789.00000000001), false); 
    });
});