Change rpc server example to use simple restore function

test/test_rpc_calculator.py

@@ -0,0 +1,35 @@
+import capnp
+import os
+import socket
+import gc
+
+import sys  # add examples dir to sys.path
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'examples'))
+import calculator_client
+import calculator_server
+
+
+def test_calculator():
+    read, write = socket.socketpair(socket.AF_UNIX)
+
+    server = capnp.TwoPartyServer(write, calculator_server.restore)
+    calculator_client.main(read)
+
+
+def test_calculator_gc():
+    def new_evaluate_impl(old_evaluate_impl):
+        def call(*args, **kwargs):
+            gc.collect()
+            return old_evaluate_impl(*args, **kwargs)
+        return call
+
+    read, write = socket.socketpair(socket.AF_UNIX)
+
+    # inject a gc.collect to the beginning of every evaluate_impl call
+    evaluate_impl_orig = calculator_server.evaluate_impl
+    calculator_server.evaluate_impl = new_evaluate_impl(evaluate_impl_orig)
+
+    server = capnp.TwoPartyServer(write, calculator_server.restore)
+    calculator_client.main(read)
+
+    calculator_server.evaluate_impl = evaluate_impl_orig