old_contents: #!/usr/bin/env python3
  
  import unittest
  import pandas as pd
  
  from fetch_trends import fetch_hourly_data
  
  
  class TestFetch(unittest.TestCase):
  
      def test_fetch_type(self):
          result = fetch_hourly_data("test", 2021, 1, 1, 2021, 1, 12)
          self.assertIsInstance(result, pd.DataFrame, "Should be a dataframe")
  
  if __name__ == '__main__':
      unittest.main()
  
  
  
new_contents: #!/usr/bin/env python3
  
  import unittest
  import pandas as pd
  
  from fetch_trends import fetch_hourly_data, aggregate_hourly_to_daily
  from dates import get_end_times, get_start_times
  
  
  class TestFetch(unittest.TestCase):
  
      def setUp(self):
          self.hourly_result = fetch_hourly_data("test", 2021, 1, 1, 2021, 1, 1)
          self.daily_result = aggregate_hourly_to_daily(self.hourly_result)
  
      def test_fetch_return_types(self):
          self.assertIsInstance(self.hourly_result, pd.DataFrame, "Should be a dataframe")
          self.assertIsInstance(self.daily_result, pd.DataFrame, "Should be a dataframe")
  
      def test_dataframe_lengths(self):
          self.assertEquals(len(self.hourly_result), 24, "Should have 24 hours of data")
          self.assertEquals(len(self.daily_result), 1, "Should have one day of data")
  
      def test_daily_is_aggregate(self):
          sum_hourly = sum(self.hourly_result['test'].tolist())
          self.assertEquals(sum_hourly, self.daily_result['test'].tolist()[0])
  
  
  class TestDates(unittest.TestCase):
      def setUp(self):
          self.start = get_start_times(0)
          self.end = get_end_times()
  
      def test_dates_return_types(self):
          self.assertIsInstance(self.start, tuple, "Must return tuple")
          self.assertIsInstance(self.end, tuple, "Must return tuple")
  
      def test_dates_return_contents(self):
          for val in self.start:
              self.assertIsInstance(val, int, "Tuple contents must be ints")
          for val in self.end:
              self.assertIsInstance(val, int, "Tuple contents must be ints")
  
      def test_dates_return_length(self):
          self.assertEqual(len(self.start), 3, "Must return 3 integers")
          self.assertEqual(len(self.end), 3, "Must return 3 integers")
  
      def test_epoch_to_date(self):
          self.assertEqual(self.start, (1970, 1, 1), "Should be epoch date")
  
  if __name__ == '__main__':
      unittest.main()
  
  
  
subject: Add unit testing of dates and fetch functions