function sampleHandler(diffs) {
  var diff = diffs[0];
  if (diff.getName().indexOf('tableC') == -1) {
    // Not what we care.
    return;
  }

  assertEquals(2, diff.getAdded().size);
  assertEquals(2, diff.getDeleted().size);
  assertEquals(2, diff.getModified().size);
  resolver.resolve();
}
@param {!Array<lf.cache.TableDiff>} diffs