);
        assertClassList(getContainerCell(grid.$.items, 10, 0), ['10', 'foo10', 'col0']);
      });

      it('should be called for details cell with undefined column', done => {
        grid.rowDetailsRenderer = (root, grid, model) => {};
        grid.cellClassNameGenerator = (column, model) =>
          model.index + ' ' + column;
        requestAnimationFrame(() => {
          assertClassList(getContainerCell(grid.$.items, 0, 2), ['0', 'undefined']);
          done();
        });
      });

      it('s