1 files changed, 35 insertions, 0 deletions
diff --git a/tensorflow/python/kernel_tests/functional_ops_test.py b/tensorflow/python/kernel_tests/functional_ops_test.py
index 3ddb5e06c9..e39daf1371 100644
--- a/tensorflow/python/kernel_tests/functional_ops_test.py
+++ b/tensorflow/python/kernel_tests/functional_ops_test.py
@@ -20,6 +20,7 @@ from __future__ import print_function
 
 import numpy as np
 
+from tensorflow.core.framework import attr_value_pb2
 from tensorflow.core.protobuf import config_pb2
 from tensorflow.python.client import session
 from tensorflow.python.data.ops import iterator_ops
@@ -738,6 +739,40 @@ class FunctionalOpsTest(test.TestCase):
           self.assertAllEqual(Run(sess, 20.), 210.)
           self.assertAllEqual(Run(sess, 100.), 5050.)
 
+  def testWhileLowering(self):
+
+    def Run(n, fetch_by_name):
+      for use_gpu in (True, False):
+        with ops.Graph().as_default() as g:
+
+          @function.Defun(*[dtypes.float32] * 2)
+          def Cond(n, unused_x):
+            return n > 0
+
+          @function.Defun(*[dtypes.float32] * 2)
+          def Body(n, x):
+            return n - 1, x + n
+
+          # outputs: [0, n*(n+1)/2]
+          outputs = functional_ops.While([n, 0.], Cond, Body, name="my_while")
+
+          # `outputs` is the list of output tensors of the While op. We
+          # arbitrarily choose the 0th tensor to get the While op and set the
+          # lowering attribute on it.
+          outputs[0].op._set_attr("_lower_using_switch_merge",
+                                  attr_value_pb2.AttrValue(b=True))
+          if not fetch_by_name:
+            fetch = outputs[1]
+          else:
+            fetch = "my_while:1"
+        with self.test_session(graph=g, use_gpu=use_gpu) as sess:
+          return sess.run(fetch)
+
+    self.assertAllEqual(Run(20., False), 210.)
+    self.assertAllEqual(Run(20., True), 210.)
+    self.assertAllEqual(Run(100., False), 5050.)
+    self.assertAllEqual(Run(100., True), 5050.)
+
   def testWhileError(self):
     for use_gpu in (True, False):
       with ops.Graph().as_default() as g: