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[web] Add tests for js/components/helpers/VirtualScroll.js

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This commit is contained in:
Matthew Shao 2017-05-15 16:44:02 +08:00
parent 801f78f3ed
commit 6757eda23a
1 changed files with 21 additions and 0 deletions
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21
web/src/js/__tests__/components/helpers/VirtualScrollSpec.js Normal file
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import { calcVScroll } from '../../../components/helpers/VirtualScroll'
describe('VirtualScroll', () => {
it('should return default state without options', () => {
expect(calcVScroll()).toEqual({start: 0, end: 0, paddingTop: 0, paddingBottom: 0})
})
it('should calculate position without itemHeights', () => {
expect(calcVScroll({itemCount: 0, rowHeight: 32, viewportHeight: 400, viewportTop: 0})).toEqual({
start: 0, end: 0, paddingTop: 0, paddingBottom: 0
})
})
it('should calculate position with itemHeights', () => {
expect(calcVScroll({itemCount: 5, itemHeights: [100, 100, 100, 100, 100],
viewportHeight: 300, viewportTop: 0})).toEqual({
start: 0, end: 4, paddingTop: 0, paddingBottom: 100
})
})
})