code: def test_decr_existing_metric(self, name):
      expected_calls = [
          mock.call(1, attributes=None),
          mock.call(-1, attributes=None),
      ]
      # Create the metric and set value to 1
      self.stats.incr(name)
  
      # Decrement value to 0
      self.stats.decr(name)
  
      self.map[full_name(name)].add.assert_has_calls(expected_calls)
      assert self.map[full_name(name)].add.call_count == len(
          expected_calls
      )
  
imports: from __future__ import annotations
  import logging
  import time
  from unittest import mock
  from unittest.mock import ANY
  import pytest
  from opentelemetry.metrics import MeterProvider
  from airflow.exceptions import InvalidStatsNameException
  from airflow.metrics.otel_logger import OTEL_NAME_MAX_LENGTH, UP_DOWN_COUNTERS, MetricsMap, SafeOtelLogger, _generate_key_name, _is_up_down_counter, full_name
  from airflow.metrics.validators import BACK_COMPAT_METRIC_NAMES, MetricNameLengthExemptionWarning
label_desc: Use image node_id 11 for calling the TestOtelMetrics obj's underlying member method code with example usage: obj.test_decr_existing_metric(name) without return types