code: def test_histogram():
      """Test the dummy histogram we're working with below"""
      df, hist1, hist2, hist3 = get_test_histograms1()
  
      assert hist1.entries == 5
      assert hist1.n_dim == 1
      assert hist1.size == 5
  
      assert hist2.entries == 5
      assert hist2.n_dim == 2
      assert hist2.num == 5
  
      assert hist3.entries == 5
      assert hist3.n_dim == 3
      assert hist3.num == 7
  
file_path: popmon/tests/popmon/analysis/test_hist_numpy.py
imports: import histogrammar
  import numpy
  import pandas
  import pytest
  from popmon.analysis.hist_numpy import assert_similar_hists, check_similar_hists, get_2dgrid, get_consistent_numpy_1dhists, get_consistent_numpy_2dgrids, get_consistent_numpy_entries, get_contentType, prepare_2dgrid, set_2dgrid
label_desc: Use image node_id 5 for calling a global function with example usage: test_histogram() without return types