xture id="grid">
    <template>
      <vaadin-grid size="200">
        <vaadin-grid-column path="value" header="col0"></vaadin-grid-column>
        <vaadin-grid-column path="value" header="col1"></vaadin-grid-column>
      </vaadin-grid>
    </template>
  </test-fixture>

  <script>
    describe('class name generator', () => {
      let grid, firstCell, initialCellClasses;

      beforeEach(() => {
        grid = fixture('grid');
        grid.dataProvider = infiniteDataProvider;
        flushGrid(grid);

  