adding first draft of tests for all examples, they need comments and clean up, some could be made more rebust

examples/test/test_baresshd.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python
+
+"""TEST"""
+
+import unittest
+import pexpect
+from time import sleep
+from mininet.log import setLogLevel
+from mininet.clean import cleanup, sh
+
+class testBareSSHD( unittest.TestCase ):
+    "Test ping with single switch topology (common code)."
+
+    opts = [ '\(yes/no\)\?', 'Welcome to h1', 'refused', pexpect.EOF, pexpect.TIMEOUT ]
+
+    def connected( self ):
+        "check connected"
+        p = pexpect.spawn( 'ssh 10.0.0.1 -i /tmp/ssh/test_rsa ' )
+        while True:
+            index = p.expect( self.opts )
+            if index == 0:
+                p.sendline( 'yes' )
+            elif index == 1:
+                return True
+            else:
+                return False
+
+    def setUp( self ):
+        self.assertFalse( self.connected() )
+        # create public key pair for testing
+        sh( 'mkdir /tmp/ssh' )
+        sh( "ssh-keygen -t rsa -P '' -f /tmp/ssh/test_rsa" )
+        sh( 'cat /tmp/ssh/test_rsa.pub >> /tmp/ssh/authorized_keys' )
+        cmd = ( 'python -m mininet.examples.baresshd '
+                '-o AuthorizedKeysFile=/tmp/ssh/authorized_keys '
+                '-o StrictModes=no' )
+        sh( cmd )
+
+    def testSSH( self ):
+        result = False
+        # try to connect up to 3 times
+        for _ in range( 3 ):
+            result = self.connected()
+            if result:
+                break
+            else:
+                sleep( 1 )
+        self.assertTrue( result )
+
+    def tearDown( self ):
+        # kill the ssh process
+        sh( "ps aux | grep 'ssh.*Banner' | awk '{ print $2 }' | xargs kill" )
+        cleanup()
+        # remove public key pair
+        sh( 'rm -rf /tmp/ssh' )
+
+
+if __name__ == '__main__':
+    setLogLevel( 'warning' )
+    unittest.main()