old_contents: #! /usr/bin/env python3
  # -*- coding: utf-8 -*-
  # vim:fenc=utf-8
  #
  # Copyright © 2016 Damian Ziobro <damian@xmementoit.com>
  
  import unittest
  import math
  
  class TestMathMethods(unittest.TestCase):
  
      def setUp(self):
          self.number = 3.5
  
      def test_ceil(self):
          self.assertEqual(math.ceil(self.number), 4);
  
  if __name__ == "__main__": 
      print ("running unittests for math")
      unittest.main();
  
new_contents: #! /usr/bin/env python3
  # -*- coding: utf-8 -*-
  # vim:fenc=utf-8
  #
  # Copyright © 2016 Damian Ziobro <damian@xmementoit.com>
  
  import unittest
  import math
  
  class TestMathMethods(unittest.TestCase):
  
      def setUp(self):
          self.number = 3.5
          self.negativeNumber = -3.5
  
      def test_ceil(self):
          self.assertEqual(math.ceil(self.number), 4);
  
      def test_fabs(self):
          self.assertEqual(math.fabs(self.negativeNumber), 3.5);
  
  if __name__ == "__main__": 
      print ("running unittests for math")
      unittest.main();
  
subject: test math.fabs()