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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
import calculateSizeAndPositionDataAndUpdateScrollOffset from './calculateSizeAndPositionDataAndUpdateScrollOffset'

describe('calculateSizeAndPositionDataAndUpdateScrollOffset', () => {
  function helper ({
    cellCount = 100,
    cellSize = 10,
    computeMetadataCallbackProps = {},
    nextCellsCount = 100,
    nextCellSize = 10,
    nextScrollToIndex,
    scrollToIndex
  } = {}) {
    const computeMetadataCallbackCalls = []
    const updateScrollOffsetForScrollToIndexCalls = []

    calculateSizeAndPositionDataAndUpdateScrollOffset({
      cellCount,
      cellSize,
      computeMetadataCallback: params => computeMetadataCallbackCalls.push(params),
      computeMetadataCallbackProps,
      nextCellsCount,
      nextCellSize,
      nextScrollToIndex,
      scrollToIndex,
      updateScrollOffsetForScrollToIndex: params => updateScrollOffsetForScrollToIndexCalls.push(params)
    })

    return {
      computeMetadataCallbackCalls,
      updateScrollOffsetForScrollToIndexCalls
    }
  }

  it('should call :computeMetadataCallback if :cellCount has changed', () => {
    const { computeMetadataCallbackCalls } = helper({
      cellCount: 100,
      nextCellsCount: 200
    })
    expect(computeMetadataCallbackCalls.length).toEqual(1)
  })

  it('should call :computeMetadataCallback if numeric :cellSize has changed', () => {
    const { computeMetadataCallbackCalls } = helper({
      cellSize: 10,
      nextCellSize: 20
    })
    expect(computeMetadataCallbackCalls.length).toEqual(1)
  })

  it('should not call :computeMetadataCallback if :cellSize callback has changed', () => {
    const { computeMetadataCallbackCalls } = helper({
      cellSize: () => {},
      nextCellSize: () => {}
    })
    expect(computeMetadataCallbackCalls.length).toEqual(0)
  })

  it('should not call :updateScrollOffsetForScrollToIndex if :scrollToIndex is not specified', () => {
    const { updateScrollOffsetForScrollToIndexCalls } = helper()
    expect(updateScrollOffsetForScrollToIndexCalls.length).toEqual(0)
  })

  it('should not call :updateScrollOffsetForScrollToIndex if :scrollToIndex has also changed', () => {
    const { updateScrollOffsetForScrollToIndexCalls } = helper({
      scrollToIndex: 10,
      nextScrollToIndex: 20
    })
    expect(updateScrollOffsetForScrollToIndexCalls.length).toEqual(0)
  })

  it('should not call :computeMetadataCallback if the above conditions are not true', () => {
    const { computeMetadataCallbackCalls } = helper()
    expect(computeMetadataCallbackCalls.length).toEqual(0)
  })
})