code: def test_histogram():
      class DummyHistogram(AbstractHistogram):
          pass
  
      DummyHistogram.__abstractmethods__ = set()
      h = DummyHistogram("test_histogram")
      assert h.name == "test_histogram"
      assert h.description == ""
      assert h.tag_keys == ()
      assert h.type == "Histogram"
      assert h.record(1) is None
  
file_path: mars/mars/metrics/backends/tests/test_metric.py
imports: import pytest
  from ..metric import AbstractMetric, AbstractCounter, AbstractGauge, AbstractMeter, AbstractHistogram
label_desc: Use image node_id 6 for calling a global function with example usage: test_histogram() without return types