code: def test_histogrammar():
      hist1, hist2, hist3 = get_histograms()
  
      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/hist/test_histogram.py
imports: import histogrammar
  import numpy
  import pandas
  from popmon.hist.hist_utils import is_numeric, is_timestamp, project_on_x, project_split2dhist_on_axis, sparse_bin_centers_x, split_hist_along_first_dimension, sum_entries, sum_over_x
label_desc: Use image node_id 4 for calling a global function with example usage: test_histogrammar() without return types