text: from unittest import TestCase
  
  import math
  import stats_test
  import stats_test_correl_diff
  
  
  class TestStatsTestCorrelDiff(TestCase):
      def test_stats_test_correl_diff(self):
          n1 = 80
          n2 = 65
          r1 = 0.538
          r2 = 0.743
          sigificance = 0.05
          (is_reject, test_stat) = stats_test_correl_diff.test_correl_diff(
              n1, n2, r1, r2, sigificance)
          self.assertTrue(is_reject)
          self.assertAlmostEqual(test_stat, -2.085, places=3)
  