message: Update test case to cover all scenarios
diff: @@ -419,11 +419,13 @@ class ClipTest(test.TestCase):
  def testClipByValueEmptyTensor(self):
  # Test case for GitHub issue 19337
  - z = array_ops.placeholder(dtype=dtypes.float32, shape=None)
  - x = clip_ops.clip_by_value(z, z, 1)
  - y = clip_ops.clip_by_value(z, 1, z)
  + zero = array_ops.placeholder(dtype=dtypes.float32, shape=None)
  + x = clip_ops.clip_by_value(zero, zero, zero)
  + y = clip_ops.clip_by_value(zero, 1.0, 1.0)
  + z = clip_ops.clip_by_value(zero, zero, 1.0)
  + w = clip_ops.clip_by_value(zero, 1.0, zero)
  with self.test_session(use_gpu=True) as sess:
  - sess.run([x, y], feed_dict={z: np.zeros((7, 0))})
  + sess.run([x, y, z, w], feed_dict={zero: np.zeros((7, 0))})
  if __name__ == '__main__':
  