text: import getUpdatedOffsetForIndex from './getUpdatedOffsetForIndex';
  import { getCellMetadata } from './TestHelper';
  describe('getUpdatedOffsetForIndex', function () {
    function testHelper(targetIndex, currentOffset) {
      var cellMetadata = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : getCellMetadata();
      return getUpdatedOffsetForIndex({
        cellOffset: cellMetadata[targetIndex].offset,
        cellSize: cellMetadata[targetIndex].size,
        containerSize: 50,
        currentOffset: currentOffset
      });
    }
  
    it('should scroll to the beginning', function () {
      expect(testHelper(0, 100)).toEqual(0);
    });
    it('should scroll forward to the middle', function () {
      expect(testHelper(4, 0)).toEqual(20);
    });
    it('should scroll backward to the middle', function () {
      expect(testHelper(2, 100)).toEqual(30);
    });
    it('should not scroll if an item is already visible', function () {
      expect(testHelper(2, 20)).toEqual(20);
    });
    it('should scroll to the end', function () {
      expect(testHelper(8, 0)).toEqual(110);
    });
    it('should honor specified :align values', function () {
      expect(getUpdatedOffsetForIndex({
        align: 'auto',
        cellOffset: 50,
        cellSize: 10,
        containerSize: 50,
        currentOffset: 0
      })).toEqual(10);
      expect(getUpdatedOffsetForIndex({
        align: 'start',
        cellOffset: 50,
        cellSize: 10,
        containerSize: 50,
        currentOffset: 0
      })).toEqual(50);
      expect(getUpdatedOffsetForIndex({
        align: 'auto',
        cellOffset: 50,
        cellSize: 10,
        containerSize: 50,
        currentOffset: 100
      })).toEqual(50);
      expect(getUpdatedOffsetForIndex({
        align: 'end',
        cellOffset: 50,
        cellSize: 10,
        containerSize: 50,
        currentOffset: 100
      })).toEqual(10);
      expect(getUpdatedOffsetForIndex({
        align: 'center',
        cellOffset: 50,
        cellSize: 10,
        containerSize: 50,
        currentOffset: 100
      })).toEqual(30);
    });
  });