old_contents: import unittest2
  
  from mlabns.util import distance
  
  class DistanceTestCase(unittest2.TestCase):
  
    def testValidSmallDistance(self):
      dist = distance.distance(0, 0, 10, 10)
      self.assertEqual(1568.5205567985761, dist)
  
    def testValidLargeDistance(self):
      dist = distance.distance(20, 20, 100, 100)
      self.assertEqual(8009.5721050828461, dist)
  
    def testInvalidInputs(self):
      import math
      from numbers import Number
      dist = 0
      try:
        dist = distance.distance(-700,1000,999,-5454)
      except Exception:
        self.fail("distance threw an exception on invalid entry")
      self.assertTrue(isinstance(dist, Number))
      self.assertFalse(math.isnan(dist))
  
  
  if __name__ == '__main__':
    unittest2.main()
  
new_contents: import unittest2
  
  from mlabns.util import distance
  
  class DistanceTestCase(unittest2.TestCase):
  
      def testValidSmallDistance(self):
          dist = distance.distance(0, 0, 10, 10)
          self.assertEqual(1568.5205567985761, dist)
  
      def testValidLargeDistance(self):
          dist = distance.distance(20, 20, 100, 100)
          self.assertEqual(8009.5721050828461, dist)
  
      def testInvalidInputs(self):
          import math
          from numbers import Number
          dist = 0
          try:
              dist = distance.distance(-700,1000,999,-5454)
          except Exception:
              self.fail("distance threw an exception on invalid entry")
          self.assertTrue(isinstance(dist, Number))
          self.assertFalse(math.isnan(dist))
  
  
  if __name__ == '__main__':
      unittest2.main()
  
subject: Update indentation as per style guide