code: def test_yaml_to_cache_util_fail_missing_fields(self):
      metrics_cache_obj = MetricsCacheYamlImpl(
          os.path.join(dir_path, "metrics_missing_types.yaml")
      )
      with pytest.raises(merrors.MetricsCacheKeyError) as exc_info:
          metrics_cache_obj.initialize_cache()
      assert (
          str(exc_info)
          == "<ExceptionInfo MetricsCacheKeyError(\"Key not found in cache spec: 'unit'\") tblen=2>"
      )
  
imports: import os
  import uuid
  import pytest
  import ts.metrics.metric_cache_errors
  from ts.metrics.caching_metric import CachingMetric
  from ts.metrics.dimension import Dimension
  from ts.metrics.metric_cache_yaml_impl import MetricsCacheYamlImpl
  from ts.metrics.metric_type_enum import MetricTypes
label_desc: Use image node_id 3 for calling the TestYamlCacheInit obj's underlying member method code with example usage: obj.test_yaml_to_cache_util_fail_missing_fields() without return types