115 lines
3.7 KiB
JavaScript
115 lines
3.7 KiB
JavaScript
"use strict";
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var expect = require('expect.js');
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var Immutable = require('immutable');
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var Bag = require('../src/bag.js');
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describe('immutable bag', function () {
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it('should be initializable from a set', function () {
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var b = Bag.fromSet(Immutable.Set(['a', 'b', 'c']));
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expect(b.count()).to.equal(3);
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expect(Bag.get(b, 'a')).to.equal(1);
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expect(Bag.get(b, 'z')).to.equal(0);
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});
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it('should be initializable from an array', function () {
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var b = Bag.fromSet(['a', 'b', 'c', 'a']);
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expect(b.count()).to.equal(3);
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expect(Bag.get(b, 'a')).to.equal(1);
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expect(Bag.get(b, 'z')).to.equal(0);
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});
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it('should be immutable', function () {
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var b = Bag.Bag();
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Bag.change(b, 'a', 1);
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Bag.change(b, 'a', 1);
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expect(b).to.equal(Bag.Bag());
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});
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it('should count up', function () {
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var b = Bag.Bag();
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var change1, change2;
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({bag: b, net: change1} = Bag.change(b, 'a', 1));
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({bag: b, net: change2} = Bag.change(b, 'a', 1));
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expect(change1).to.equal(Bag.ABSENT_TO_PRESENT);
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expect(change2).to.equal(Bag.PRESENT_TO_PRESENT);
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expect(Bag.get(b, 'a')).to.equal(2);
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expect(Bag.get(b, 'z')).to.equal(0);
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});
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it('should count down', function () {
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var b = Bag.fromSet(['a']);
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var c1, c2, c3, c4;
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({bag: b, net: c1} = Bag.change(b, 'a', 1));
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({bag: b, net: c2} = Bag.change(b, 'a', -1));
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expect(b.count()).to.equal(1);
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expect(c1).to.equal(Bag.PRESENT_TO_PRESENT);
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expect(c2).to.equal(Bag.PRESENT_TO_PRESENT);
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({bag: b, net: c3} = Bag.change(b, 'a', -1));
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expect(b.count()).to.equal(0);
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expect(c3).to.equal(Bag.PRESENT_TO_ABSENT);
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expect(Bag.get(b, 'a')).to.equal(0);
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expect(Bag.get(b, 'z')).to.equal(0);
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({bag: b, net: c4} = Bag.change(b, 'a', -1));
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expect(b.count()).to.equal(1);
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expect(c4).to.equal(Bag.ABSENT_TO_PRESENT);
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expect(Bag.get(b, 'a')).to.equal(-1);
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});
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it('should be clamped', function() {
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var b = Bag.fromSet(['a']);
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({bag: b} = Bag.change(b, 'a', -1, true));
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({bag: b} = Bag.change(b, 'a', -1, true));
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({bag: b} = Bag.change(b, 'a', -1, true));
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({bag: b} = Bag.change(b, 'a', -1, true));
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expect(b.count()).to.equal(0);
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expect(Bag.get(b, 'a')).to.equal(0);
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});
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});
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describe('mutable bag', function () {
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it('should be initializable from a set', function () {
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var b = new Bag.MutableBag(Immutable.Set(['a', 'b', 'c']));
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expect(b.count()).to.equal(3);
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expect(b.get('a')).to.equal(1);
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expect(b.get('z')).to.equal(0);
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});
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it('should be initializable from an array', function () {
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var b = new Bag.MutableBag(['a', 'b', 'c', 'a']);
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expect(b.count()).to.equal(3);
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expect(b.get('a')).to.equal(1);
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expect(b.get('z')).to.equal(0);
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});
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it('should be mutable', function () {
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var b = new Bag.MutableBag();
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b.change('a', 1);
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b.change('a', 1);
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expect(b.get('a')).to.equal(2);
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expect(b.get('z')).to.equal(0);
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});
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it('should count up', function () {
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var b = new Bag.MutableBag();
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expect(b.change('a', 1)).to.equal(Bag.ABSENT_TO_PRESENT);
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expect(b.change('a', 1)).to.equal(Bag.PRESENT_TO_PRESENT);
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expect(b.get('a')).to.equal(2);
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expect(b.get('z')).to.equal(0);
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});
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it('should count down', function () {
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var b = new Bag.MutableBag(['a']);
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expect(b.change('a', 1)).to.equal(Bag.PRESENT_TO_PRESENT);
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expect(b.change('a', -1)).to.equal(Bag.PRESENT_TO_PRESENT);
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expect(b.count()).to.equal(1);
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expect(b.change('a', -1)).to.equal(Bag.PRESENT_TO_ABSENT);
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expect(b.count()).to.equal(0);
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expect(b.get('a')).to.equal(0);
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expect(b.get('z')).to.equal(0);
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expect(b.change('a', -1)).to.equal(Bag.ABSENT_TO_PRESENT);
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expect(b.count()).to.equal(1);
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expect(b.get('a')).to.equal(-1);
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});
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});
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