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test.js
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test.js
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const assert = require('assert');
Object.freeze(assert);
const Sorter = require('./src/index.js');
describe('Sorter', () => {
let sorter;
beforeEach(() => {
sorter = new Sorter();
});
it('adds element', () => {
sorter.add(5);
assert.deepEqual(sorter.toArray(), [5]);
assert.deepEqual(sorter.length, 1);
});
it('adds different types', () => {
sorter.add('123');
sorter.add(123);
sorter.add(new Number(123));
sorter.add(Symbol(123));
assert.deepEqual(sorter.length, 4);
});
describe('sorts numbers by default', () => {
it('1', () => {
sorter.add(5);
sorter.sort([0]);
assert.deepEqual(sorter.toArray(), [5]);
assert.deepEqual(sorter.length, 1);
});
it('2', () => {
sorter.add(5);
sorter.add(6);
sorter.sort([0]);
assert.deepEqual(sorter.toArray(), [5, 6]);
assert.deepEqual(sorter.length, 2);
});
it('3', () => {
sorter.add(7);
sorter.add(6);
sorter.add(5);
sorter.sort([0, 1, 2]);
assert.deepEqual(sorter.toArray(), [5, 6, 7]);
assert.deepEqual(sorter.length, 3);
assert.deepEqual(sorter.at(0), 5);
assert.deepEqual(sorter.at(1), 6);
assert.deepEqual(sorter.at(2), 7);
});
it('3', () => {
sorter.add(7);
sorter.add(6);
sorter.add(5);
sorter.sort([0, 1]);
assert.deepEqual(sorter.toArray(), [6, 7, 5]);
assert.deepEqual(sorter.length, 3);
assert.deepEqual(sorter.at(0), 6);
assert.deepEqual(sorter.at(1), 7);
assert.deepEqual(sorter.at(2), 5);
});
it('4', () => {
sorter.add(7);
sorter.add(6);
sorter.add(5);
sorter.sort([1, 2]);
assert.deepEqual(sorter.toArray(), [7, 5, 6]);
assert.deepEqual(sorter.length, 3);
assert.deepEqual(sorter.at(0), 7);
assert.deepEqual(sorter.at(1), 5);
assert.deepEqual(sorter.at(2), 6);
});
it('5', () => {
sorter.add(7);
sorter.add(6);
sorter.add(5);
sorter.sort([0, 1, 2]);
sorter.add(3);
assert.deepEqual(sorter.toArray(), [5, 6, 7, 3]);
assert.deepEqual(sorter.length, 4);
assert.deepEqual(sorter.at(0), 5);
assert.deepEqual(sorter.at(1), 6);
assert.deepEqual(sorter.at(2), 7);
assert.deepEqual(sorter.at(3), 3);
});
it('6', () => {
sorter.add(7);
sorter.add(6);
sorter.add(5);
sorter.sort([0, 1, 2]);
sorter.add(3);
sorter.add(2);
sorter.add(1);
sorter.sort([0, 1, 2]);
assert.deepEqual(sorter.toArray(), [5, 6, 7, 3, 2, 1]);
assert.deepEqual(sorter.length, 6);
assert.deepEqual(sorter.at(0), 5);
assert.deepEqual(sorter.at(1), 6);
assert.deepEqual(sorter.at(2), 7);
assert.deepEqual(sorter.at(3), 3);
});
it('7', () => {
sorter.add(6);
sorter.add(5);
sorter.sort([0, 1]);
sorter.add(2);
sorter.add(1);
sorter.sort([0, 1]);
assert.deepEqual(sorter.toArray(), [5, 6, 2, 1]);
assert.deepEqual(sorter.length, 4);
assert.deepEqual(sorter.at(0), 5);
assert.deepEqual(sorter.at(1), 6);
assert.deepEqual(sorter.at(2), 2);
assert.deepEqual(sorter.at(3), 1);
});
it('8', () => {
sorter.add(6);
sorter.add(5);
sorter.sort([0, 1]);
sorter.add(2);
sorter.add(1);
sorter.sort([1, 0]);
assert.deepEqual(sorter.toArray(), [5, 6, 2, 1]);
assert.deepEqual(sorter.length, 4);
assert.deepEqual(sorter.at(0), 5);
assert.deepEqual(sorter.at(1), 6);
assert.deepEqual(sorter.at(2), 2);
assert.deepEqual(sorter.at(3), 1);
});
it('9', () => {
sorter.add(6);
sorter.add(5);
sorter.add(2);
sorter.add(1);
sorter.sort([1, 2]);
sorter.sort([2, 3]);
assert.deepEqual(sorter.toArray(), [6, 2, 1, 5]);
assert.deepEqual(sorter.length, 4);
assert.deepEqual(sorter.at(0), 6);
assert.deepEqual(sorter.at(1), 2);
assert.deepEqual(sorter.at(2), 1);
assert.deepEqual(sorter.at(3), 5);
});
it('10', () => {
sorter.add(6);
sorter.add(5);
sorter.add(2);
sorter.add(1);
sorter.sort([2, 1]);
sorter.sort([2, 3]);
assert.deepEqual(sorter.toArray(), [6, 2, 1, 5]);
assert.deepEqual(sorter.length, 4);
assert.deepEqual(sorter.at(0), 6);
assert.deepEqual(sorter.at(1), 2);
assert.deepEqual(sorter.at(2), 1);
assert.deepEqual(sorter.at(3), 5);
});
it('11', () => {
sorter.add(6);
sorter.add(5);
sorter.add(2);
sorter.add(1);
sorter.sort([2, 1]);
sorter.sort([3, 2]);
assert.deepEqual(sorter.toArray(), [6, 2, 1, 5]);
assert.deepEqual(sorter.length, 4);
assert.deepEqual(sorter.at(0), 6);
assert.deepEqual(sorter.at(1), 2);
assert.deepEqual(sorter.at(2), 1);
assert.deepEqual(sorter.at(3), 5);
});
it('12', () => {
sorter.add(6);
sorter.add(5);
sorter.add(20);
sorter.add(10);
sorter.sort([2, 1]);
sorter.sort([3, 2]);
assert.deepEqual(sorter.toArray(), [6, 5, 10, 20]);
assert.deepEqual(sorter.length, 4);
assert.deepEqual(sorter.at(0), 6);
assert.deepEqual(sorter.at(1), 5);
assert.deepEqual(sorter.at(2), 10);
assert.deepEqual(sorter.at(3), 20);
});
it('13', () => {
sorter.add(6);
sorter.add(5);
sorter.add(20);
sorter.add(10);
sorter.add(100);
sorter.sort([2, 1]);
sorter.sort([3, 2]);
sorter.sort([4, 3]);
assert.deepEqual(sorter.toArray(), [6, 5, 10, 20, 100]);
assert.deepEqual(sorter.length, 5);
assert.deepEqual(sorter.at(0), 6);
assert.deepEqual(sorter.at(1), 5);
assert.deepEqual(sorter.at(2), 10);
assert.deepEqual(sorter.at(3), 20);
assert.deepEqual(sorter.at(4), 100);
});
it('14', () => {
sorter.add(6);
sorter.add(5);
sorter.add(20);
sorter.add(10);
sorter.add(100);
sorter.sort([2, 1]);
sorter.sort([3, 2]);
sorter.sort([4, 3]);
sorter.add(1000);
assert.deepEqual(sorter.toArray(), [6, 5, 10, 20, 100, 1000]);
assert.deepEqual(sorter.length, 6);
assert.deepEqual(sorter.at(0), 6);
assert.deepEqual(sorter.at(1), 5);
assert.deepEqual(sorter.at(2), 10);
assert.deepEqual(sorter.at(3), 20);
assert.deepEqual(sorter.at(4), 100);
assert.deepEqual(sorter.at(5), 1000);
});
});
describe('sorts with custom comparator', () => {
const AGE_COMPARATOR = (left, right) => left.age - right.age;
const REVERSE_COMPARATOR = (left, right) => right - left;
const STRINGIFY_COMPARATOR = (left, right) => JSON.stringify(left, null, 2).length - JSON.stringify(right, null, 2).length;
describe('age comparator', () => {
it('1', () => {
sorter.add({ age: 20 });
sorter.add({ age: 18 });
sorter.add({ age: 16 });
sorter.setComparator(AGE_COMPARATOR);
sorter.sort([0, 1]);
assert.deepEqual(sorter.at(0).age, 18);
assert.deepEqual(sorter.at(1).age, 20);
assert.deepEqual(sorter.at(2).age, 16);
});
it('2', () => {
sorter.add({ age: 20 });
sorter.add({ age: 18 });
sorter.add({ age: 16 });
sorter.setComparator(AGE_COMPARATOR);
sorter.sort([0, 1]);
sorter.add({ age: 14 });
sorter.sort([3, 2]);
assert.deepEqual(sorter.at(0).age, 18);
assert.deepEqual(sorter.at(1).age, 20);
assert.deepEqual(sorter.at(2).age, 14);
assert.deepEqual(sorter.at(3).age, 16);
});
});
describe('reverse comparator', () => {
it('1', () => {
sorter.add(6);
sorter.add(5);
sorter.add(20);
sorter.add(10);
sorter.add(100);
sorter.setComparator(REVERSE_COMPARATOR);
sorter.sort([1, 0]);
assert.deepEqual(sorter.toArray(), [6, 5, 20, 10, 100]);
assert.deepEqual(sorter.length, 5);
assert.deepEqual(sorter.at(0), 6);
assert.deepEqual(sorter.at(1), 5);
assert.deepEqual(sorter.at(2), 20);
assert.deepEqual(sorter.at(3), 10);
assert.deepEqual(sorter.at(4), 100);
});
it('2', () => {
sorter.add(6);
sorter.add(5);
sorter.setComparator(REVERSE_COMPARATOR);
sorter.sort([1, 0]);
sorter.add(20);
sorter.add(10);
sorter.add(100);
sorter.sort([3, 4]);
assert.deepEqual(sorter.toArray(), [6, 5, 20, 100, 10]);
assert.deepEqual(sorter.length, 5);
assert.deepEqual(sorter.at(0), 6);
assert.deepEqual(sorter.at(1), 5);
assert.deepEqual(sorter.at(2), 20);
assert.deepEqual(sorter.at(3), 100);
assert.deepEqual(sorter.at(4), 10);
});
});
describe('stringify comparator', () => {
it('1', () => {
sorter.add({ age: 20, name: 'Alex' });
sorter.add({ age: 18, smth: 'Anything' });
sorter.add({ age: 5, course: 'Rolling Scopes' });
sorter.setComparator(STRINGIFY_COMPARATOR);
sorter.sort([0, 1]);
assert.deepEqual(sorter.at(0).age, 20);
assert.deepEqual(sorter.at(1).age, 18);
assert.deepEqual(sorter.at(2).age, 5);
});
it('2', () => {
sorter.add({ age: 20, name: 'Alex' });
sorter.sort([0]);
sorter.sort([0]);
sorter.add({ age: 5, course: 'Rolling Scopes' });
sorter.add({ age: 18, smth: 'Anything' });
sorter.setComparator(STRINGIFY_COMPARATOR);
sorter.sort([2, 1]);
assert.deepEqual(sorter.at(0).age, 20);
assert.deepEqual(sorter.at(1).age, 18);
assert.deepEqual(sorter.at(2).age, 5);
});
it('3', () => {
sorter.add({ age: 20, name: 'Alex' });
sorter.sort([0]);
sorter.sort([0]);
sorter.add({ age: 5, course: 'Rolling Scopes' });
sorter.add({ age: 18, smth: 'Anything' });
sorter.add({ age: 7, smth: 'Some' });
sorter.setComparator(STRINGIFY_COMPARATOR);
sorter.sort([2, 1]);
sorter.sort([3, 1]);
assert.deepEqual(sorter.at(0).age, 20);
assert.deepEqual(sorter.at(1).age, 7);
assert.deepEqual(sorter.at(2).age, 5);
assert.deepEqual(sorter.at(3).age, 18);
});
});
describe('mixed comparator', () => {
it('hard', () => {
sorter.add({ age: 30, name: 'Dzmitry' });
sorter.add({ age: 40, name: 'Alex' });
sorter.setComparator(AGE_COMPARATOR);
sorter.sort([1, 0]);
sorter.add(2);
sorter.add(10);
sorter.setComparator(REVERSE_COMPARATOR);
sorter.sort([2, 3]);
sorter.setComparator(STRINGIFY_COMPARATOR)
sorter.add('hello');
sorter.add('hello world');
sorter.sort([0, 2]);
sorter.sort([1, 3]);
sorter.sort([5, 2]);
assert.deepEqual(sorter.at(0), 10);
assert.deepEqual(sorter.at(1), 2);
assert.deepEqual(sorter.at(2), 'hello world');
assert.deepEqual(sorter.at(3), { age: 40, name: 'Alex' });
assert.deepEqual(sorter.at(4), 'hello');
assert.deepEqual(sorter.at(5), { age: 30, name: 'Dzmitry' });
});
});
});
});