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

examples/test/test_emptynet.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+
+"""TEST"""
+
+import unittest
+import pexpect
+#from time import sleep
+from mininet.log import setLogLevel
+#from mininet.net import Mininet
+#from mininet.node import CPULimitedHost
+#from mininet.link import TCLink
+
+#from mininet.examples.simpleperf import SingleSwitchTopo
+
+class testEmptyNet( unittest.TestCase ):
+    "Test ping with single switch topology (common code)."
+
+    prompt = 'mininet>'
+
+    def testEmptyNet( self ):
+        p = pexpect.spawn( 'python -m mininet.examples.emptynet' )
+        p.expect( self.prompt )
+        p.sendline( 'pingall' )
+        p.expect ( '(\d+)% dropped' )
+        percent = int( p.match.group( 1 ) ) if p.match else -1
+        self.assertEqual( percent, 0 ) # or this
+        p.expect( self.prompt )
+        p.sendline( 'iperf' )
+        p.expect( "Results: \['[\d.]+ .bits/sec', '[\d.]+ .bits/sec'\]" )
+        #TODO check the results? maybe we dont care
+        p.expect( self.prompt )
+        p.sendline( 'exit' )
+        p.wait()
+        #TODO remove this
+        self.assertEqual( percent, 0 )
+
+if __name__ == '__main__':
+    setLogLevel( 'warning' )
+    unittest.main()