21 lines
647 B
TypeScript
21 lines
647 B
TypeScript
 
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import { test } from 'node:test';
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import assert from 'node:assert/strict';
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import { pinchZoom } from './usePinchZoom';
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test('pinchZoom scales with finger distance', () => {
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assert.equal(pinchZoom(100, 1, 200), 2);
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assert.equal(pinchZoom(100, 2, 150), 3);
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assert.equal(pinchZoom(200, 3, 100), 1.5);
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});
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test('pinchZoom clamps to 1×–5×', () => {
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assert.equal(pinchZoom(100, 1, 1000), 5);
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assert.equal(pinchZoom(100, 1, 20), 1);
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});
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test('pinchZoom snaps near 1× and ignores a zero start', () => {
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assert.equal(pinchZoom(100, 1, 105), 1);
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assert.equal(pinchZoom(100, 2, 52), 1);
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assert.equal(pinchZoom(0, 1.7, 120), 1.7);
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});
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