gnome-shell/tests/unit/insertSorted.js

/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */

// Test cases for Util.insertSorted

const JsUnit = imports.jsUnit;

// Needed so that Util can bring some UI stuff
// we don't actually use
const Environment = imports.ui.environment;
Environment.init();
const Util = imports.misc.util;

function assertArrayEquals(errorMessage, array1, array2) {
    JsUnit.assertEquals(errorMessage + ' length',
                        array1.length, array2.length);
    for (let j = 0; j < array1.length; j++) {
        JsUnit.assertEquals(errorMessage + ' item ' + j,
                            array1[j], array2[j]);
    }
}

function cmp(one, two) {
    return one-two;
}

let arrayInt = [1, 2, 3, 5, 6];
Util.insertSorted(arrayInt, 4, cmp);

assertArrayEquals('first test', [1,2,3,4,5,6], arrayInt);

// no comparator, integer sorting is implied
Util.insertSorted(arrayInt, 3);

assertArrayEquals('second test', [1,2,3,3,4,5,6], arrayInt);

let obj1 = { a: 1 };
let obj2 = { a: 2, b: 0 };
let obj3 = { a: 2, b: 1 };
let obj4 = { a: 3 };

function objCmp(one, two) {
    return one.a - two.a;
}

let arrayObj = [obj1, obj3, obj4];

// obj2 compares equivalent to obj3, should be
// inserted before
Util.insertSorted(arrayObj, obj2, objCmp);

assertArrayEquals('object test', [obj1, obj2, obj3, obj4], arrayObj);

function checkedCmp(one, two) {
    if (typeof one != 'number' ||
        typeof two != 'number')
        throw new TypeError('Invalid type passed to checkedCmp');

    return one-two;
}

let arrayEmpty = [];

// check that no comparisons are made when
// inserting in a empty array
Util.insertSorted(arrayEmpty, 3, checkedCmp);

// Insert at the end and check that we don't
// access past it
Util.insertSorted(arrayEmpty, 4, checkedCmp);
Util.insertSorted(arrayEmpty, 5, checkedCmp);

// Some more insertions
Util.insertSorted(arrayEmpty, 2, checkedCmp);
Util.insertSorted(arrayEmpty, 1, checkedCmp);

assertArrayEquals('checkedCmp test', [1, 2, 3, 4, 5], arrayEmpty);