Additional test on make_csv_dataset

Verify the delim and NAvalue are compatible with different inputs.

tensorflow/python/data/experimental/kernel_tests/make_csv_dataset_test.py

@@ -449,6 +449,29 @@ class MakeCsvDatasetTest(test_base.DatasetTestBase):
         header=True,
     )
 
+  def testMakeCSVDataset_withNAValuesAndFieldDelim(self):
+    """Tests that datasets can be created from different delim and na_value.
+    """
+    column_names = ["col%d" % i for i in range(5)]
+    inputs = [["0 1 2 3 4", "5 6 7 8 9"], ["10 11 12 13 14", "15 16 17 ? 19"]]
+    expected_output = [[0, 1, 2, 3, 4], [5, 6, 7, 8, 9],
+                       [10, 11, 12, 13, 14], [15, 16, 17, 0, 19]]
+    label = "col0"
+
+    self._test_dataset(
+        inputs,
+        expected_output=expected_output,
+        expected_keys=column_names,
+        column_names=column_names,
+        label_name=label,
+        batch_size=1,
+        num_epochs=1,
+        shuffle=False,
+        header=False,
+        na_value="?",
+        field_delim=" ",
+    )
+
   def testMakeCSVDataset_withSelectCols(self):
     record_defaults = [
         constant_op.constant([], dtypes.int32),