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4grayandClaude Fable 5.1
4586616d54
A level persisted before the shortcuts existed (the macOS menu roles never clamped, and the store restores any finite level) was clamped BEFORE the step, so the first zoom-in from level 7 rendered smaller. Step from the raw level instead: a press further out leaves an out-of-range level where it is, a press back in lands on the limit. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
61 lines
2.5 KiB
TypeScript
61 lines
2.5 KiB
TypeScript
import {
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clampZoomLevel,
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stepZoomLevel,
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ZOOM_LEVEL_MAX,
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ZOOM_LEVEL_MIN,
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ZOOM_LEVEL_STEP,
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} from './zoom-level.util';
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describe('zoom level shortcuts contract', () => {
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it('steps by the Electron menu-role step in both directions', () => {
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expect(stepZoomLevel(0, 'in')).toBe(ZOOM_LEVEL_STEP);
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expect(stepZoomLevel(0, 'out')).toBe(-ZOOM_LEVEL_STEP);
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expect(stepZoomLevel(1, 'in')).toBe(1.5);
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expect(stepZoomLevel(-1.5, 'out')).toBe(-2);
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});
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it('resets to the default level from anywhere', () => {
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expect(stepZoomLevel(3, 'reset')).toBe(0);
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expect(stepZoomLevel(-2.5, 'reset')).toBe(0);
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expect(stepZoomLevel(Number.NaN, 'reset')).toBe(0);
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});
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it('clamps at the app limits, not at Chromium limits', () => {
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expect(stepZoomLevel(ZOOM_LEVEL_MAX, 'in')).toBe(ZOOM_LEVEL_MAX);
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expect(stepZoomLevel(ZOOM_LEVEL_MIN, 'out')).toBe(ZOOM_LEVEL_MIN);
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expect(stepZoomLevel(ZOOM_LEVEL_MAX - 0.5, 'in')).toBe(ZOOM_LEVEL_MAX);
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expect(clampZoomLevel(ZOOM_LEVEL_MIN - 1)).toBe(ZOOM_LEVEL_MIN);
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});
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it('never moves a stored out-of-range level against the request', () => {
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// The macOS menu roles never clamped and the store restores any
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// finite level, so an upgrade can start beyond the limits.
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expect(stepZoomLevel(ZOOM_LEVEL_MAX + 1, 'in')).toBe(
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ZOOM_LEVEL_MAX + 1
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);
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expect(stepZoomLevel(ZOOM_LEVEL_MAX + 1, 'out')).toBe(ZOOM_LEVEL_MAX);
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expect(stepZoomLevel(ZOOM_LEVEL_MAX + 0.3, 'out')).toBe(ZOOM_LEVEL_MAX);
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expect(stepZoomLevel(ZOOM_LEVEL_MIN - 1, 'out')).toBe(
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ZOOM_LEVEL_MIN - 1
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);
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expect(stepZoomLevel(ZOOM_LEVEL_MIN - 1, 'in')).toBe(ZOOM_LEVEL_MIN);
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expect(stepZoomLevel(ZOOM_LEVEL_MIN - 1, 'reset')).toBe(0);
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});
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it('snaps an off-grid level to the next grid point in the requested direction', () => {
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// A level the macOS menu roles or an older store left between steps.
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expect(stepZoomLevel(0.3, 'in')).toBe(0.5);
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expect(stepZoomLevel(0.3, 'out')).toBe(0);
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expect(stepZoomLevel(-0.7, 'out')).toBe(-1);
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expect(stepZoomLevel(-0.7, 'in')).toBe(-0.5);
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});
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it('treats a non-finite level as the default', () => {
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expect(stepZoomLevel(Number.NaN, 'in')).toBe(ZOOM_LEVEL_STEP);
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expect(stepZoomLevel(Number.POSITIVE_INFINITY, 'out')).toBe(
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-ZOOM_LEVEL_STEP
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);
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expect(clampZoomLevel(Number.NaN)).toBe(0);
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});
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});
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