34 lines
1.1 KiB
TypeScript
34 lines
1.1 KiB
TypeScript
import { describe, it, expect } from 'vitest';
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import { demandWeight, releaseCurve } from '../../src/sim/demand';
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import { getGame } from '../../src/sim/catalog';
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import { START_DATE } from '../../src/sim/calendar';
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import { testCatalog } from './helpers';
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describe('demand', () => {
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it('is zero before release and peaks at launch', () => {
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expect(releaseCurve(-1)).toBe(0);
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expect(releaseCurve(0)).toBe(1.5);
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expect(releaseCurve(29)).toBe(1.5);
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});
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it('decays to 0.5 after two years and floors at 0.3', () => {
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expect(releaseCurve(730)).toBeCloseTo(0.5);
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expect(releaseCurve(5000)).toBeCloseTo(0.3);
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});
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it('never increases over time after release', () => {
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let prev = releaseCurve(0);
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for (let d = 10; d <= 6000; d += 10) {
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const v = releaseCurve(d);
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expect(v).toBeLessThanOrEqual(prev + 1e-9);
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prev = v;
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}
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});
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it('scales by base popularity', () => {
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const catalog = testCatalog();
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expect(demandWeight(getGame(catalog, 'sml'), START_DATE)).toBeCloseTo(0.95 * 1.5);
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expect(demandWeight(getGame(catalog, 'future'), START_DATE)).toBe(0);
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});
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});
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