EXPECT_EQ(0, sharding.tile_assignment_devices_size());
}

TEST(DecodeShardingAttributeTest, CheckMaximalShardString) {
  xla::OpSharding sharding;
  EXPECT_TRUE(
      DecodeShardingAttribute("{maximal device=0}", sharding).succeeded());
  EXPECT_TRUE(sharding.type() == sharding.MAXIMAL);
  EXPECT_EQ(1, sharding.tile_assignment_devices_size());
}
}  // namespace

    if (sharding.type() == xla::OpSharding::OTHER &&
        sharding.tile_assignment_devices_size() != num_cores_per_replica)
      return cluster_func.emitError(llvm::formatv(
          "incorrect sharding format for outputs. Number of "
          "tiled outputs({0}) must match the number of logical "
          "devices({1})",
          sharding.tile_assignment_devices_size(), num_cores_per_replica));

    if (sharding.type() != xla::OpSharding::MAXIMAL) {
      continue;
    }
    if (sharding.tile_assignment_devices_size() != 1) {
      op->emitOpError("TF/XLA TPU bridge input check: There must be ")
          << "exactly 1 device for MAXIMAL sharding."
          << " Number of devices assigned are "
          << sharding.tile_assignment_devices_size() << "\n";
      return false;
    } else {