code: def testNormalizePadding(self):
      self.assertEqual("same", utils.normalize_padding("SAME"))
      self.assertEqual("valid", utils.normalize_padding("VALID"))
  
      with self.assertRaises(ValueError):
          utils.normalize_padding("invalid")
  
file_path: tensorflow-upstream/tensorflow/python/layers/utils_test.py
imports: from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import test_util
  from tensorflow.python.layers import utils
  from tensorflow.python.ops import array_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the ConvUtilsTest obj's underlying member method code with example usage: obj.testNormalizePadding() without return types