frameworkize nested_test.

tests/nested_test.py

 import os
-import mitogen.utils
+import unittest
 
-@mitogen.utils.run_with_router
-def main(router):
-    mitogen.utils.log_to_file()
+import testlib
 
-    context = None
-    for x in range(1, 11):
-        print 'Connect local%d via %s' % (x, context)
-        context = router.local(via=context, name='local%d' % x)
 
-    context.call(os.system, 'pstree -s python -s mitogen')
+class NestedTest(testlib.RouterMixin, testlib.TestCase):
+    def test_nested(self):
+        context = None
+        for x in range(1, 11):
+            #print 'Connect local%d via %s' % (x, context)
+            context = self.router.local(via=context, name='local%d' % x)
 
+        pid = context.call(os.getpid)
+        self.assertTrue(isinstance(pid, int))
+
+
+if __name__ == '__main__':
+    unittest.main()