29 lines
891 B
TypeScript
29 lines
891 B
TypeScript
import { afterEach, describe, expect, it } from 'vitest';
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import { attachMusicPulse, readMusicPulse, setMusicPulseAudible } from '@/audio/music-pulse';
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const fakeAnalyser = (level: number) => ({
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frequencyBinCount: 8,
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getByteFrequencyData(target: Uint8Array) { target.fill(level); },
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}) as unknown as AnalyserNode;
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afterEach(() => {
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attachMusicPulse(null);
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setMusicPulseAudible(false);
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});
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describe('music pulse', () => {
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it('reads zero without an analyser', () => {
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setMusicPulseAudible(true);
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expect(readMusicPulse()).toBe(0);
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});
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it('reads zero while the soundtrack is not audible', () => {
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attachMusicPulse(fakeAnalyser(255));
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expect(readMusicPulse()).toBe(0);
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});
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it('normalizes the low-band level when audible', () => {
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attachMusicPulse(fakeAnalyser(51));
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setMusicPulseAudible(true);
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expect(readMusicPulse()).toBeCloseTo(0.2);
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});
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});
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