old_contents: import unittest
  
  from acoustics.atmosphere import atmosphere
  
  class AtmosphereCase(unittest.TestCase):
      
      
      def test_standard_atmosphere(self):
          
          a = Atmosphere()
          
          self.assertEqual(a.temperature, 293.15)
          self.assertEqual(a.pressure, 101.325)
          self.assertEqual(a.relative_humidity, 0.0)
          self.assertEqual(a.soundspeed, 343.2)
      
      
  if __name__ == '__main__':
      unittest.main()
new_contents: import unittest
  
  from acoustics.atmosphere import Atmosphere
  
  class AtmosphereCase(unittest.TestCase):
      
      
      def test_standard_atmosphere(self):
          
          a = Atmosphere()
          
          self.assertEqual(a.temperature, 293.15)
          self.assertEqual(a.pressure, 101.325)
          self.assertEqual(a.relative_humidity, 0.0)
          self.assertEqual(a.soundspeed, 343.2)
      
      
  if __name__ == '__main__':
      unittest.main()
  
subject: Fix typo