message: Add test with interleave into Ignite Dataset.
diff: @@ -22,6 +22,7 @@ import os
  from tensorflow.python.platform import test
  from tensorflow_io.ignite import IgniteDataset
  +from tensorflow.data import Dataset
  from tensorflow.python.client import session
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  @@ -47,6 +48,18 @@ class IgniteDatasetTest(test.TestCase):
  ds = IgniteDataset(cache_name="SQL_PUBLIC_TEST_CACHE", port=42300)
  self._check_dataset(ds)
  + def test_ignite_dataset_with_plain_client_with_interleave(self):
  + """Test Ignite Dataset with plain client with interleave.
  +
  + """
  + self._clear_env()
  + ds = Dataset.from_tensor_slices(["localhost"]).interleave(
  + lambda host: IgniteDataset(cache_name="SQL_PUBLIC_TEST_CACHE",
  + schema_host="localhost", host=host,
  + port=42300), cycle_length=4, block_length=16
  + )
  + self._check_dataset(ds)
  +
  def _clear_env(self):
  """Clears environment variables used by Ignite Dataset.
  