react-virtualized/source/Collection/Section.test.js at passive-scrolling · mattvague/react-virtualized · GitHub

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import Section from './Section'

describe('Section', () => {
  function helper ({
    height = 100,
    width = 200,
    x = 0,
    y = 0
  } = {}) {
    return new Section({
      height,
      width,
      x,
      y
    })
  }

  it('should add a new cell index', () => {
    const section = helper()
    expect(section.getCellIndices()).toEqual([])
    section.addCellIndex({ index: 0 })
    expect(section.getCellIndices()).toEqual([0])
    section.addCellIndex({ index: 1 })
    expect(section.getCellIndices()).toEqual([0, 1])
  })

  it('should not add a duplicate cell index', () => {
    const section = helper()
    section.addCellIndex({ index: 0 })
    section.addCellIndex({ index: 1 })
    section.addCellIndex({ index: 0 })
    section.addCellIndex({ index: 1 })
    section.addCellIndex({ index: 2 })
    expect(section.getCellIndices()).toEqual([0, 1, 2])
  })

  it('should define a working toString() method for debugging', () => {
    const section = helper({
      height: 100,
      width: 200,
      x: 25,
      y: 50
    })

    expect(section.toString()).toEqual('25,50 200x100')
  })
})