code: def test_size_improvement_rate__rate_lt_1(self):
      original_size = 0.5
      optimized_size = 1
      res = OptimizeInferenceResult(
          original_model=MagicMock(size_mb=original_size),
          hardware_setup=MagicMock(),
          optimized_model=MagicMock(size_mb=optimized_size),
      )
      self.assertLess(res.size_improvement_rate, 1)
  
imports: import unittest
  from unittest.mock import MagicMock
  from nebullvm.core.models import OptimizeInferenceResult
label_desc: Use image node_id 15 for calling the TestOptimizeInferenceResult obj's underlying member method code with example usage: obj.test_size_improvement_rate__rate_lt_1() without return types