react-native-macos/Libraries/Utilities/__tests__/PixelRatio-test.js

53 строки
1.2 KiB
JavaScript

/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @format
* @emails oncall+react_native
*/
'use strict';
describe('PixelRatio', () => {
const Dimensions = require('../Dimensions');
const PixelRatio = require('../PixelRatio');
beforeEach(() => {
Dimensions.set({
windowPhysicalPixels: {
width: 400,
height: 800,
scale: 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({
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);
});
});