issue #155: skeletal fork_test.

test.sh

@@ -40,6 +40,7 @@ run_test tests/call_function_test.py
 run_test tests/channel_test.py
 run_test tests/fakessh_test.py
 run_test tests/first_stage_test.py
+run_test tests/fork_test.py
 run_test tests/id_allocation_test.py
 run_test tests/importer_test.py
 run_test tests/latch_test.py

tests/fork_test.py

+
+import os
+
+import mitogen
+import unittest2
+
+import testlib
+import plain_old_module
+
+
+class ForkTest(testlib.RouterMixin, unittest2.TestCase):
+    def test_okay(self):
+        context = self.router.fork()
+        self.assertNotEqual(context.call(os.getpid), os.getpid())
+        self.assertEqual(context.call(os.getppid), os.getpid())
+
+
+if __name__ == '__main__':
+    unittest2.main()