ASHEBShop-h5/node_modules/react-virtualized/dist/commonjs/Grid/defaultOverscanIndicesGetter.jest.js

'use strict';

var _defaultOverscanIndicesGetter = require('./defaultOverscanIndicesGetter');

var _defaultOverscanIndicesGetter2 = _interopRequireDefault(_defaultOverscanIndicesGetter);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

describe('overscanIndicesGetter', function () {
  function testHelper(_ref) {
    var cellCount = _ref.cellCount,
        startIndex = _ref.startIndex,
        stopIndex = _ref.stopIndex,
        overscanCellsCount = _ref.overscanCellsCount,
        scrollDirection = _ref.scrollDirection;

    return (0, _defaultOverscanIndicesGetter2.default)({
      cellCount: cellCount,
      overscanCellsCount: overscanCellsCount,
      scrollDirection: scrollDirection,
      startIndex: startIndex,
      stopIndex: stopIndex
    });
  }

  it('should not overscan if :overscanCellsCount is 0', function () {
    expect(testHelper({
      cellCount: 100,
      startIndex: 10,
      stopIndex: 20,
      overscanCellsCount: 0,
      scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_BACKWARD
    })).toEqual({
      overscanStartIndex: 10,
      overscanStopIndex: 20
    });

    expect(testHelper({
      cellCount: 100,
      startIndex: 10,
      stopIndex: 20,
      overscanCellsCount: 0,
      scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_FORWARD
    })).toEqual({
      overscanStartIndex: 10,
      overscanStopIndex: 20
    });
  });

  it('should overscan forward', function () {
    expect(testHelper({
      cellCount: 100,
      startIndex: 20,
      stopIndex: 30,
      overscanCellsCount: 10,
      scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_FORWARD
    })).toEqual({
      overscanStartIndex: 20,
      overscanStopIndex: 40
    });
  });

  it('should overscan backward', function () {
    expect(testHelper({
      cellCount: 100,
      startIndex: 20,
      stopIndex: 30,
      overscanCellsCount: 10,
      scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_BACKWARD
    })).toEqual({
      overscanStartIndex: 10,
      overscanStopIndex: 30
    });
  });

  it('should not overscan beyond the start of the list', function () {
    expect(testHelper({
      cellCount: 100,
      startIndex: 5,
      stopIndex: 15,
      overscanCellsCount: 10,
      scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_BACKWARD
    })).toEqual({
      overscanStartIndex: 0,
      overscanStopIndex: 15
    });
  });

  it('should not overscan beyond the end of the list', function () {
    expect(testHelper({
      cellCount: 25,
      startIndex: 10,
      stopIndex: 20,
      overscanCellsCount: 10,
      scrollDirection: _defaultOverscanIndicesGetter.SCROLL_DIRECTION_FORWARD
    })).toEqual({
      overscanStartIndex: 10,
      overscanStopIndex: 24
    });
  });
});