react-virtualized/source/Grid/utils/updateScrollIndexHelper.jest.js at master · mattvague/react-virtualized · GitHub

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import updateScrollIndexHelper from './updateScrollIndexHelper'
import CellSizeAndPositionManager from './CellSizeAndPositionManager'

// Default cell sizes and offsets for use in shared tests
export function getCellSizeAndPositionManager ({
  cellCount = CELL_SIZES.length,
  estimatedCellSize = 10
}) {
  return new CellSizeAndPositionManager({
    cellCount,
    cellSizeGetter: ({ index }) => CELL_SIZES[index % CELL_SIZES.length],
    estimatedCellSize
  })
}

const CELL_SIZES = [
  10, // 0: 0..0 (min)
  20, // 1: 0..10
  15, // 2: 0..30
  10, // 3: 5..45
  15, // 4: 20..55
  30, // 5: 50..70
  20, // 6: 70..100
  10, // 7: 80..110
  30 //  8: 110..110 (max)
]

describe('updateScrollIndexHelper', () => {
  function helper ({
    cellCount = undefined,
    cellSizeAndPositionManager,
    cellSize = 10,
    previousCellsCount = undefined,
    previousCellSize = 10,
    previousScrollToAlignment = 'auto',
    previousScrollToIndex,
    previousSize = 50,
    scrollOffset = 0,
    scrollToAlignment = 'auto',
    scrollToIndex,
    size = 50
  } = {}) {
    cellSizeAndPositionManager = cellSizeAndPositionManager || getCellSizeAndPositionManager({ cellCount })
    cellCount = cellCount === undefined
      ? cellSizeAndPositionManager.getCellCount()
      : cellCount
    previousCellsCount = previousCellsCount === undefined
      ? cellCount
      : previousCellsCount

    let updateScrollIndexCallbackCalled = false

    function updateScrollIndexCallback (params) {
      updateScrollIndexCallbackCalled = true
    }

    updateScrollIndexHelper({
      cellCount,
      cellSizeAndPositionManager,
      cellSize,
      previousCellsCount,
      previousCellSize,
      previousScrollToAlignment,
      previousScrollToIndex,
      previousSize,
      scrollOffset,
      scrollToAlignment,
      scrollToIndex,
      size,
      updateScrollIndexCallback
    })

    return updateScrollIndexCallbackCalled
  }

  it('should not call :updateScrollIndexCallback if there is no :scrollToIndex and size has not changed', () => {
    expect(helper()).toEqual(false)
  })

  it('should not call :updateScrollIndexCallback if an invalid :scrollToIndex has been specified', () => {
    expect(helper({
      size: 100,
      previousSize: 50,
      scrollToIndex: -1
    })).toEqual(false)
  })

  it('should call :updateScrollIndexCallback if there is a :scrollToIndex and :size has changed', () => {
    expect(helper({
      cellCount: 100,
      size: 100,
      previousSize: 50,
      scrollToIndex: 10
    })).toEqual(true)
  })

  it('should call :updateScrollIndexCallback if there is a :scrollToIndex and :cellSize has changed', () => {
    expect(helper({
      cellCount: 100,
      cellSize: 15,
      previousCellSize: 20,
      scrollToIndex: 10
    })).toEqual(true)
  })

  it('should call :updateScrollIndexCallback if previous :scrollToIndex has changed', () => {
    expect(helper({
      cellCount: 15,
      previousScrollToIndex: 20,
      scrollToIndex: 10
    })).toEqual(true)
  })

  it('should call :updateScrollIndexCallback if :cellCount has been reduced past the current scroll offset', () => {
    expect(helper({
      previousCellsCount: 100,
      scrollOffset: 510
    })).toEqual(true)
  })

  it('should call :updateScrollIndexCallback if there is no :scrollToIndex but :size has been reduced', () => {
    expect(helper({
      previousSize: 100,
      scrollOffset: 510,
      size: 50
    })).toEqual(true)
  })

  it('should not measure rows if :size or :cellCount have been reduced but only use already measured (or estimated) total size', () => {
    const cellSizeAndPositionManager = {
      getCellCount: () => CELL_SIZES.length,
      getTotalSize: () => 560
    }

    expect(helper({
      cellSizeAndPositionManager,
      previousSize: 100,
      scrollOffset: 510,
      size: 50
    })).toEqual(false)
  })

  it('should not call :updateScrollIndexCallback if there is no :scrollToIndex but :cellCount has been increased', () => {
    expect(helper({
      cellCount: 100,
      previousCellsCount: 50
    })).toEqual(false)
  })

  it('should not call :updateScrollIndexCallback if there is no :scrollToIndex but :size has been increased', () => {
    expect(helper({
      previousSize: 50,
      size: 100
    })).toEqual(false)
  })

  it('should call :updateScrollIndexCallback if :scrollToAlignment has changed', () => {
    expect(helper({
      previousScrollToAlignment: 'start',
      scrollToAlignment: 'end',
      scrollToIndex: 5
    })).toEqual(true)
  })

  it('should not call :updateScrollIndexCallback if :scrollToAlignment has changed but there is no :scrollToIndex', () => {
    expect(helper({
      previousScrollToAlignment: 'start',
      scrollToAlignment: 'end'
    })).toEqual(false)
  })
})