docstr: Test loading keras file that's not a zip.
docstr_tok: ["Test","loading","keras","file","that","'s","not","a","zip","."]
code: def test_load_keras_not_zip(self):
      """Test loading keras file that's not a zip."""
      with self.assertRaisesRegex(ValueError, "File not found"):
          saving_api.load_model("not_a_zip.keras")
  
imports: import os
  import unittest.mock
  import numpy
  from absl import logging
  from keras import layers
  from keras.models import Sequential
  from keras.saving import saving_api
  from keras.testing import test_case
label_desc: Use image node_id 4 for calling the LoadModelTests obj's underlying member method code with example usage: obj.test_load_keras_not_zip() without return types