51 lines
1.8 KiB
TypeScript
51 lines
1.8 KiB
TypeScript
/// SPDX-License-Identifier: GPL-3.0-or-later
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/// SPDX-FileCopyrightText: Copyright © 2016-2023 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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import { KeyedSet } from '@preserves/core';
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import { Bag, ChangeDescription } from '../src/runtime/bag';
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describe('bag', () => {
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it('should be initializable from a set', () => {
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const b = new Bag(new KeyedSet<string>(['a', 'b', 'c']));
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expect(b.size).toBe(3);
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expect(b.get('a')).toBe(1);
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expect(b.get('z')).toBe(0);
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});
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it('should be mutable', () => {
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const b = new Bag();
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b.change('a', 1);
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b.change('a', 1);
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expect(b.get('a')).toBe(2);
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});
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it('should count up', () => {
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const b = new Bag();
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expect(b.change('a', 1)).toBe(ChangeDescription.ABSENT_TO_PRESENT);
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expect(b.change('a', 1)).toBe(ChangeDescription.PRESENT_TO_PRESENT);
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expect(b.get('a')).toBe(2);
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expect(b.get('z')).toBe(0);
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});
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it('should count down', () => {
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const b = new Bag(new KeyedSet<string>(['a']));
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expect(b.change('a', 1)).toBe(ChangeDescription.PRESENT_TO_PRESENT);
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expect(b.change('a', -1)).toBe(ChangeDescription.PRESENT_TO_PRESENT);
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expect(b.size).toBe(1);
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expect(b.change('a', -1)).toBe(ChangeDescription.PRESENT_TO_ABSENT);
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expect(b.size).toBe(0);
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expect(b.get('a')).toBe(0);
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expect(b.get('z')).toBe(0);
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expect(b.change('a', -1)).toBe(ChangeDescription.ABSENT_TO_PRESENT);
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expect(b.size).toBe(1);
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expect(b.get('a')).toBe(-1);
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});
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it('should be clamped', function() {
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const b = new Bag(new KeyedSet(['a']));
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for (let i = 0; i < 4; i++) b.change('a', -1, true);
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expect(b.size).toBe(0);
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expect(b.get('a')).toBe(0);
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});
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});
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