41 lines
1.1 KiB
TypeScript
41 lines
1.1 KiB
TypeScript
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import { describe, it, expect } from 'vitest';
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import { clampZoom, computeZoom, type TimelineState } from '$lib/timeline/interactions';
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describe('clampZoom', () => {
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it('clamps zoom above minimum', () => {
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expect(clampZoom(0.5, 60)).toBeGreaterThanOrEqual(1);
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});
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it('clamps zoom below maximum', () => {
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expect(clampZoom(10000, 60)).toBeLessThanOrEqual(600);
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});
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});
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describe('computeZoom', () => {
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it('zooming in narrows the visible range', () => {
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const state: TimelineState = {
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visibleStart: 0,
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visibleEnd: 60,
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zoom: 1,
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width: 600,
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height: 160,
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};
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const result = computeZoom(state, 30, 1.1, 60);
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const newRange = result.visibleEnd - result.visibleStart;
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expect(newRange).toBeLessThan(60);
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});
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it('zooming out widens the visible range', () => {
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const state: TimelineState = {
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visibleStart: 10,
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visibleEnd: 20,
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zoom: 6,
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width: 600,
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height: 160,
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};
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const result = computeZoom(state, 15, 0.9, 60);
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const newRange = result.visibleEnd - result.visibleStart;
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expect(newRange).toBeGreaterThan(10);
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});
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});
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