message: Add test case for dynamic input shapes
diff: @@ -609,6 +609,12 @@ class BackendShapeOpsTest(test.TestCase):
  y = backend.resize_images(x, height_factor, width_factor, data_format)
  self.assertEqual(y.shape.as_list(), [1, 3, 4, 4])
  + # Use with a dynamic axis:
  + if not context.executing_eagerly():
  + x = backend.placeholder(shape=(1, 3, None, None))
  + y = backend.resize_images(x, height_factor, width_factor, data_format)
  + self.assertEqual(y.shape.as_list(), [1, 3, None, None])
  +
  # Invalid use:
  with self.assertRaises(ValueError):
  backend.resize_images(
  