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

examples/test/test_scratchnet.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+
+"""TEST"""
+
+import unittest
+import pexpect
+from mininet.log import setLogLevel
+
+class testScratchNet( unittest.TestCase ):
+    "Test ping with single switch topology (common code)."
+
+    results = [ "1 packets transmitted, 1 received, 0% packet loss", pexpect.EOF ]
+
+    def pingTest( self, name ):
+        p = pexpect.spawn( 'python -m %s' % name )
+        index = p.expect( self.results )
+        self.assertEqual( index, 0 )
+
+
+    def testPingKernel( self ):
+        self.pingTest( 'mininet.examples.scratchnet' )
+
+
+    def testPingUser( self ):
+        self.pingTest( 'mininet.examples.scratchnetuser' )
+
+if __name__ == '__main__':
+    setLogLevel( 'warning' )
+    unittest.main()