94 lines
2.8 KiB
JavaScript
94 lines
2.8 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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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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*
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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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const {elementsThatOverlapOffsets, newRangeCount} = require('VirtualizeUtils');
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describe('newRangeCount', function() {
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it('handles subset', function() {
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expect(newRangeCount({first: 1, last: 4}, {first: 2, last: 3})).toBe(0);
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});
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it('handles forward disjoint set', function() {
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expect(newRangeCount({first: 1, last: 4}, {first: 6, last: 9})).toBe(4);
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});
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it('handles reverse disjoint set', function() {
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expect(newRangeCount({first: 6, last: 8}, {first: 1, last: 4})).toBe(4);
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});
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it('handles superset', function() {
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expect(newRangeCount({first: 1, last: 4}, {first: 0, last: 5})).toBe(2);
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});
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it('handles end extension', function() {
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expect(newRangeCount({first: 1, last: 4}, {first: 1, last: 8})).toBe(4);
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});
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it('handles front extension', function() {
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expect(newRangeCount({first: 1, last: 4}, {first: 0, last: 4})).toBe(1);
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});
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it('handles forward insersect', function() {
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expect(newRangeCount({first: 1, last: 4}, {first: 3, last: 6})).toBe(2);
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});
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it('handles reverse intersect', function() {
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expect(newRangeCount({first: 3, last: 6}, {first: 1, last: 4})).toBe(2);
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});
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});
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describe('elementsThatOverlapOffsets', function() {
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it('handles fixed length', function() {
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const offsets = [0, 250, 350, 450];
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function getFrameMetrics(index: number) {
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return {
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length: 100,
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offset: 100 * index,
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};
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}
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expect(elementsThatOverlapOffsets(offsets, 100, getFrameMetrics)).toEqual([
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0,
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2,
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3,
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4,
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]);
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});
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it('handles variable length', function() {
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const offsets = [150, 250, 900];
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const frames = [
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{offset: 0, length: 50},
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{offset: 50, length: 200},
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{offset: 250, length: 600},
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{offset: 850, length: 100},
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{offset: 950, length: 150},
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];
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expect(
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elementsThatOverlapOffsets(offsets, frames.length, ii => frames[ii]),
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).toEqual([1, 1, 3]);
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});
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it('handles out of bounds', function() {
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const offsets = [150, 900];
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const frames = [
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{offset: 0, length: 50},
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{offset: 50, length: 150},
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{offset: 250, length: 100},
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];
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expect(
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elementsThatOverlapOffsets(offsets, frames.length, ii => frames[ii]),
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).toEqual([1]);
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});
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it('errors on non-increasing offsets', function() {
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const offsets = [150, 50];
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const frames = [
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{offset: 0, length: 50},
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{offset: 50, length: 150},
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{offset: 250, length: 100},
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];
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expect(() => {
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elementsThatOverlapOffsets(offsets, frames.length, ii => frames[ii]);
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}).toThrowErrorMatchingSnapshot();
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});
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});
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