text: import unittest
  
  class TestCSV(unittest.TestCase):
  
      def test_collection_csv_serializer_renders_correct_rows(self):
          from baiji.serialization.csv import CSVCollectionSerializer
  
          example_data = {
              'one': {'foo': 'baz1', 'bar': 'inga1'},
              'three': {'foo': 'baz3', 'bar': 'inga3'},
              'two': {'foo': 'baz2', 'bar': 'inga2'},
          }
          ordering = ['one', 'two', 'three']
  
          serializer = CSVCollectionSerializer(
              collection=example_data,
              row_ordering=ordering
          )
  
          expected = [
              ['', 'bar', 'foo'],
              ['one', 'inga1', 'baz1'],
              ['two', 'inga2', 'baz2'],
              ['three', 'inga3', 'baz3'],
          ]
  
          self.assertEqual(serializer.render(), expected)
  
      def test_collection_csv_serializer_works_with_row_ordering_np_array(self):
          import numpy as np
          from baiji.serialization.csv import CSVCollectionSerializer
  
          example_data = {
              'one': {'foo': 'baz1', 'bar': 'inga1'},
              'three': {'foo': 'baz3', 'bar': 'inga3'},
              'two': {'foo': 'baz2', 'bar': 'inga2'},
          }
          ordering = np.array(['one', 'two', 'three'])
  
          serializer = CSVCollectionSerializer(
              collection=example_data,
              row_ordering=ordering
          )
  
          expected = [
              ['', 'bar', 'foo'],
              ['one', 'inga1', 'baz1'],
              ['two', 'inga2', 'baz2'],
              ['three', 'inga3', 'baz3'],
          ]
  
          self.assertEqual(serializer.render(), expected)
  