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diff --git a/src/mongo/rpc/protocol_test.cpp b/src/mongo/rpc/protocol_test.cpp
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+++ b/src/mongo/rpc/protocol_test.cpp
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+/**
+ *    Copyright (C) 2015 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the GNU Affero General Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/base/status.h"
+#include "mongo/rpc/protocol.h"
+#include "mongo/unittest/unittest.h"
+
+namespace {
+
+    using namespace mongo::rpc;
+
+    // Checks if negotiation of the first to protocol sets results in the 'proto'
+    const auto assert_negotiated = [](ProtocolSet fst, ProtocolSet snd, Protocol proto) {
+        auto negotiated = negotiate(fst, snd);
+        ASSERT_TRUE(negotiated.isOK());
+        ASSERT_TRUE(negotiated.getValue() == proto);
+    };
+
+    TEST(Protocol, SuccessfulNegotiation) {
+        assert_negotiated(supports::kAll, supports::kAll, Protocol::kOpCommandV1);
+        assert_negotiated(supports::kAll, supports::kOpCommandOnly, Protocol::kOpCommandV1);
+        assert_negotiated(supports::kAll, supports::kOpQueryOnly, Protocol::kOpQuery);
+    }
+
+    // Checks that negotiation fails
+    const auto assert_not_negotiated = [](ProtocolSet fst, ProtocolSet snd) {
+        auto proto = negotiate(fst, snd);
+        ASSERT_TRUE(!proto.isOK());
+        ASSERT_TRUE(proto.getStatus().code() == mongo::ErrorCodes::RPCProtocolNegotiationFailed);
+    };
+
+    TEST(Protocol, FailedNegotiation) {
+        assert_not_negotiated(supports::kOpQueryOnly, supports::kOpCommandOnly);
+        assert_not_negotiated(supports::kAll, supports::kNone);
+        assert_not_negotiated(supports::kOpQueryOnly, supports::kNone);
+        assert_not_negotiated(supports::kOpCommandOnly, supports::kNone);
+    }
+
+}  // namespace