old_contents: #!/usr/bin/env python
  
  """
  Test for simpleperf.py
  """
  
  import unittest
  import pexpect
  import sys
  from mininet.log import setLogLevel
  
  from mininet.examples.simpleperf import SingleSwitchTopo
  
  class testSimplePerf( unittest.TestCase ):
  
      @unittest.skipIf( '-quick' in sys.argv, 'long test' )
      def testE2E( self ):
          "Run the example and verify iperf results"
          # 10 Mb/s, plus or minus 20% tolerance
          BW = 10
  	TOLERANCE = .2 
          p = pexpect.spawn( 'python -m mininet.examples.simpleperf testmode' )
          # check iperf results
          p.expect( "Results: \['10M', '([\d\.]+) .bits/sec", timeout=480 )
          measuredBw = float( p.match.group( 1 ) )
          lowerBound = BW * ( 1 - TOLERANCE )
          upperBound = BW + ( 1 + TOLERANCE )
          self.assertGreaterEqual( measuredBw, lowerBound )
          self.assertLessEqual( measuredBw, upperBound )
          p.wait()
  
  if __name__ == '__main__':
      setLogLevel( 'warning' )
      unittest.main()
  
new_contents: #!/usr/bin/env python
  
  """
  Test for simpleperf.py
  """
  
  import unittest
  import pexpect
  import sys
  from mininet.log import setLogLevel
  
  from mininet.examples.simpleperf import SingleSwitchTopo
  
  class testSimplePerf( unittest.TestCase ):
  
      @unittest.skipIf( '-quick' in sys.argv, 'long test' )
      def testE2E( self ):
          "Run the example and verify iperf results"
          # 10 Mb/s, plus or minus 20% tolerance
          BW = 10
          TOLERANCE = .2
          p = pexpect.spawn( 'python -m mininet.examples.simpleperf testmode' )
          # check iperf results
          p.expect( "Results: \['10M', '([\d\.]+) .bits/sec", timeout=480 )
          measuredBw = float( p.match.group( 1 ) )
          lowerBound = BW * ( 1 - TOLERANCE )
          upperBound = BW + ( 1 + TOLERANCE )
          self.assertGreaterEqual( measuredBw, lowerBound )
          self.assertLessEqual( measuredBw, upperBound )
          p.wait()
  
  if __name__ == '__main__':
      setLogLevel( 'warning' )
      unittest.main()
  
subject: Fix whitespace error