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

examples/test/test_linearbandwidth.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+"""TEST"""
+
+import unittest
+import pexpect
+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 testLinearBandwidth( unittest.TestCase ):
+    "Test ping with single switch topology (common code)."
+
+    prompt = 'mininet>'
+
+    def testLinearBandwidth( self ):
+        count = 0
+        tolerance = 0.5
+        opts = [ '\*\*\* Linear network results', '(\d+)\s+([\d\.]+) (.bits)', pexpect.EOF ]
+        p = pexpect.spawn( 'python -m mininet.examples.linearbandwidth' )
+        while True:
+            index = p.expect( opts, timeout=600 )
+            if index == 0:
+                previous_bw = 10 ** 10 # 10 Gbits
+                count += 1
+            elif index == 1:
+                n = int( p.match.group( 1 ) )
+                bw = float( p.match.group( 2 ) )
+                unit = p.match.group( 3 )
+                if unit[ 0 ] == 'K':
+                    bw *= 10 ** 3
+                elif unit[ 0 ] == 'M':
+                    bw *= 10 ** 6
+                elif unit[ 0 ] == 'G':
+                    bw *= 10 ** 9
+                self.assertTrue( bw < previous_bw )
+                previous_bw = bw
+            else:
+                break
+
+        self.assertTrue( count > 0 )
+
+if __name__ == '__main__':
+    setLogLevel( 'warning' )
+    unittest.main()