code: def setUp(self):
      self.data = {"image": np.arange(16, dtype=float).reshape(1, 4, 4)}
  
file_path: MONAI/tests/test_with_allow_missing_keys.py
imports: from __future__ import annotations
  import unittest
  import numpy
  from monai.transforms import Compose, SpatialPad, SpatialPadd, allow_missing_keys_mode
label_desc: Use image node_id 1 for calling the TestWithAllowMissingKeysMode obj's underlying member method code with example usage: obj.setUp() without return types