code: def test_histogram(self):
      list_1 = [3, 3, 2, 1]
      list_2 = [2, 3, 5, 5, 5, 6, 4, 3, 7]
  
      self.assertEqual(get_histogram(list_1), {1: 1, 2: 1, 3: 2})
      self.assertEqual(
          get_histogram(list_2), {2: 1, 3: 2, 4: 1, 5: 3, 6: 1, 7: 1}
      )
  
imports: from algorithms.distribution.histogram import get_histogram
  import unittest
label_desc: Use image node_id 1 for calling the TestListsInHistogram obj's underlying member method code with example usage: obj.test_histogram() without return types