Added failing test that echos the request message

src/node/test/echo_service.proto

+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+message EchoMessage {
+  string value = 1;
+  int32 value2 = 2;
+}
+
+service EchoService {
+  rpc Echo (EchoMessage) returns (EchoMessage);
+}
\ No newline at end of file

src/node/test/surface_test.js

@@ -99,6 +99,36 @@ describe('Surface server constructor', function() {
     }, /math.Math/);
   });
 });
+describe('Echo service', function() {
+  var server;
+  var client;
+  before(function() {
+    var test_proto = ProtoBuf.loadProtoFile(__dirname + '/echo_service.proto');
+    var echo_service = test_proto.lookup('EchoService');
+    var Server = grpc.buildServer([echo_service]);
+    server = new Server({
+      'EchoService': {
+        echo: function(call, callback) {
+          callback(null, call.request);
+        }
+      }
+    });
+    var port = server.bind('localhost:0');
+    var Client = surface_client.makeProtobufClientConstructor(echo_service);
+    client = new Client('localhost:' + port);
+    server.listen();
+  });
+  after(function() {
+    server.shutdown();
+  });
+  it('should echo the recieved message directly', function(done) {
+    client.echo({value: 'test value', value2: 3}, function(error, response) {
+      assert.ifError(error);
+      assert.deepEqual(response, {value: 'test value', value2: 3});
+      done();
+    });
+  });
+});
 describe('Generic client and server', function() {
   function toString(val) {
     return val.toString();