mininet/mininet/test/test_util.py at master · faahmed/mininet

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#!/usr/bin/env python

"""Package: mininet

Test functions defined in mininet.util."""

import unittest

from mininet.util import quietRun

class testQuietRun( unittest.TestCase ):

"""Test quietRun that runs a command and returns its merged output from

STDOUT and STDIN"""

@staticmethod

def getEchoCmd( n ):

"Return a command that will print n characters"

return "echo -n " + "x" * n

def testEmpty( self ):

"Run a command that prints nothing"

output = quietRun(testQuietRun.getEchoCmd( 0 ) )

self.assertEqual( 0, len( output ) )

def testOneRead( self ):

"""Run a command whose output is entirely read on the first call if

each call reads at most 1024 characters

"""

for n in [ 42, 1024 ]:

output = quietRun( testQuietRun.getEchoCmd( n ) )

self.assertEqual( n, len( output ) )

def testMultipleReads( self ):

"Run a command whose output is not entirely read on the first read"

for n in [ 1025, 4242 ]:

output = quietRun(testQuietRun.getEchoCmd( n ) )

self.assertEqual( n, len( output ) )

if __name__ == "__main__":

unittest.main()