118 lines
4.0 KiB
TypeScript
118 lines
4.0 KiB
TypeScript
/// SPDX-License-Identifier: GPL-3.0-or-later
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/// SPDX-FileCopyrightText: Copyright © 2016-2021 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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"use strict";
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const assert = require('assert');
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const Immutable = require('immutable');
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const 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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assert.strictEqual(b.count(), 3);
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assert.strictEqual(Bag.get(b, 'a'), 1);
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assert.strictEqual(Bag.get(b, 'z'), 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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assert.strictEqual(b.count(), 3);
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assert.strictEqual(Bag.get(b, 'a'), 1);
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assert.strictEqual(Bag.get(b, 'z'), 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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assert(Immutable.is(b, 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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assert.strictEqual(change1, Bag.ABSENT_TO_PRESENT);
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assert.strictEqual(change2, Bag.PRESENT_TO_PRESENT);
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assert.strictEqual(Bag.get(b, 'a'), 2);
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assert.strictEqual(Bag.get(b, 'z'), 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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assert.strictEqual(b.count(), 1);
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assert.strictEqual(c1, Bag.PRESENT_TO_PRESENT);
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assert.strictEqual(c2, Bag.PRESENT_TO_PRESENT);
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({bag: b, net: c3} = Bag.change(b, 'a', -1));
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assert.strictEqual(b.count(), 0);
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assert.strictEqual(c3, Bag.PRESENT_TO_ABSENT);
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assert.strictEqual(Bag.get(b, 'a'), 0);
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assert.strictEqual(Bag.get(b, 'z'), 0);
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({bag: b, net: c4} = Bag.change(b, 'a', -1));
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assert.strictEqual(b.count(), 1);
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assert.strictEqual(c4, Bag.ABSENT_TO_PRESENT);
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assert.strictEqual(Bag.get(b, 'a'), -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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assert.strictEqual(b.count(), 0);
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assert.strictEqual(Bag.get(b, 'a'), 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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assert.strictEqual(b.count(), 3);
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assert.strictEqual(b.get('a'), 1);
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assert.strictEqual(b.get('z'), 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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assert.strictEqual(b.count(), 3);
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assert.strictEqual(b.get('a'), 1);
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assert.strictEqual(b.get('z'), 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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assert.strictEqual(b.get('a'), 2);
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assert.strictEqual(b.get('z'), 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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assert.strictEqual(b.change('a', 1), Bag.ABSENT_TO_PRESENT);
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assert.strictEqual(b.change('a', 1), Bag.PRESENT_TO_PRESENT);
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assert.strictEqual(b.get('a'), 2);
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assert.strictEqual(b.get('z'), 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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assert.strictEqual(b.change('a', 1), Bag.PRESENT_TO_PRESENT);
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assert.strictEqual(b.change('a', -1), Bag.PRESENT_TO_PRESENT);
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assert.strictEqual(b.count(), 1);
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assert.strictEqual(b.change('a', -1), Bag.PRESENT_TO_ABSENT);
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assert.strictEqual(b.count(), 0);
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assert.strictEqual(b.get('a'), 0);
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assert.strictEqual(b.get('z'), 0);
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assert.strictEqual(b.change('a', -1), Bag.ABSENT_TO_PRESENT);
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assert.strictEqual(b.count(), 1);
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assert.strictEqual(b.get('a'), -1);
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});
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});
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