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packages/react-native/Libraries/Utilities/__tests__/PixelRatio-test.js
52 строки
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Sam Zhou
Standardize subtyping error code into `incompatible-type` in react native and metro (#53312)
18 авг 2025, 19:04
18 авг 2025, 19:04
cf664c6
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/** * Copyright (c) Meta Platforms, Inc. and affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * * @flow strict-local * @format */ import Dimensions from '../Dimensions'; import PixelRatio from '../PixelRatio'; describe('PixelRatio', () => { beforeEach(() => { Dimensions.set({ windowPhysicalPixels: { width: 400, height: 800, scale: 2, densityDpi: 2, fontScale: 3, }, }); }); it('should give the pixel density', () => { expect(PixelRatio.get()).toEqual(2); }); it('should give the font scale when present', () => { expect(PixelRatio.getFontScale()).toEqual(3); }); it('should give the pixel density instead of the font scale when the front scale is not present', () => { Dimensions.set({ // $FlowFixMe[incompatible-type] windowPhysicalPixels: { scale: 2, }, }); expect(PixelRatio.getFontScale()).toEqual(2); }); it('should convert a layout size to pixel size', () => { expect(PixelRatio.getPixelSizeForLayoutSize(400)).toEqual(800); }); it('should round a layout size to pixel size', () => { expect(PixelRatio.roundToNearestPixel(8.4)).toEqual(8.5); }); });