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f541c34067
Summary: This PR add tests for several utilities in `Libraries/Utilities`, as a follow-up of #23903. The following utilities are now tested: * `clamp.js` * `binareToBase64.js` * `DeviceInfo.js` * `mergeIntoFast.js` * `PixelRatio.js` * `infoLog.js` * `logError.js` * `warnOnce.js` * `mapWithSeparator` (added a missing test) Not applicable, since it only adds tests. Pull Request resolved: https://github.com/facebook/react-native/pull/23989 Differential Revision: D14502806 Pulled By: cpojer fbshipit-source-id: e2c3b3a35f4f765d5336b998ab92dba14eeac7bc
53 lines
1.2 KiB
JavaScript
53 lines
1.2 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @emails oncall+react_native
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*/
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'use strict';
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describe('PixelRatio', () => {
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const Dimensions = require('Dimensions');
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const PixelRatio = require('PixelRatio');
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beforeEach(() => {
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Dimensions.set({
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windowPhysicalPixels: {
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width: 400,
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height: 800,
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scale: 2,
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fontScale: 3,
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},
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});
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});
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it('should give the pixel density', () => {
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expect(PixelRatio.get()).toEqual(2);
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});
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it('should give the font scale when present', () => {
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expect(PixelRatio.getFontScale()).toEqual(3);
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});
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it('should give the pixel density instead of the font scale when the front scale is not present', () => {
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Dimensions.set({
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windowPhysicalPixels: {
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scale: 2,
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},
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});
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expect(PixelRatio.getFontScale()).toEqual(2);
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});
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it('should convert a layout size to pixel size', () => {
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expect(PixelRatio.getPixelSizeForLayoutSize(400)).toEqual(800);
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});
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it('should round a layout size to pixel size', () => {
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expect(PixelRatio.roundToNearestPixel(8.4)).toEqual(8.5);
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});
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});
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