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#!/usr/bin/env python
"""
Test for linearbandwidth.py
"""
import unittest
from mininet.util import pexpect
import sys
class testLinearBandwidth( unittest.TestCase ):
@unittest.skipIf( '-quick' in sys.argv, 'long test' )
def testLinearBandwidth( self ):
"Verify that bandwidth is monotonically decreasing as # of hops increases"
p = pexpect.spawn( 'python -m mininet.examples.linearbandwidth' )
count = 0
opts = [ '\*\*\* Linear network results',
'(\d+)\s+([\d\.]+) (.bits)',
pexpect.EOF ]
while True:
index = p.expect( opts, timeout=600 )
if index == 0:
count += 1
elif index == 1:
n = int( p.match.group( 1 ) )
bw = float( p.match.group( 2 ) )
unit = p.match.group( 3 )
if unit[ 0 ] == 'K':
bw *= 10 ** 3
elif unit[ 0 ] == 'M':
bw *= 10 ** 6
elif unit[ 0 ] == 'G':
bw *= 10 ** 9
# check that we have a previous result to compare to
if n != 1:
info = ( 'bw: %.2e bits/s across %d switches, '
'previous: %.2e bits/s across %d switches' %
( bw, n, previous_bw, previous_n ) )
self.assertTrue( bw < previous_bw, info )
previous_bw, previous_n = bw, n
else:
break
# verify that we received results from at least one switch
self.assertTrue( count > 0 )
if __name__ == '__main__':
unittest.main()
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