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

examples/test/test_limit.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+
+"""TEST"""
+
+import unittest
+import pexpect
+from mininet.log import setLogLevel
+
+class testLimit( unittest.TestCase ):
+    "Test ping with single switch topology (common code)."
+
+    def testLimit( self ):
+        opts = [ '\*\*\* Testing network ([\d\.]+) Mbps', 
+                 '\*\*\* Results: \[([\d\., ]+)\]', 
+                 pexpect.EOF ]
+        p = pexpect.spawn( 'python -m mininet.examples.limit' )
+        count = 0
+        bw = 0
+        tolerance = 1
+        while True:
+            index = p.expect( opts )
+            if index == 0:
+                bw = float( p.match.group( 1 ) )
+                count += 1
+            elif index == 1:
+                results = p.match.group( 1 )
+                for x in results.split(','):
+                    result = float( x )
+                    self.assertTrue( result < bw + tolerance )
+                    self.assertTrue( result > bw - tolerance)
+            else:
+                break
+
+        self.assertTrue( count > 0 )
+
+if __name__ == '__main__':
+    setLogLevel( 'warning' )
+    unittest.main()