Test that server socket cannot reuse port

net/socket/tcp_server_socket_unittest.cc

Index: net/socket/tcp_server_socket_unittest.cc
diff --git a/net/socket/tcp_server_socket_unittest.cc b/net/socket/tcp_server_socket_unittest.cc
index fd81e550d080579f2b623e410b5622229db0bfd8..d95e6acf484ee6da9535aa54268957446ee95e58 100644
--- a/net/socket/tcp_server_socket_unittest.cc
+++ b/net/socket/tcp_server_socket_unittest.cc
@@ -246,6 +246,28 @@ TEST_F(TCPServerSocketTest, AcceptIO) {
   ASSERT_EQ(message, received_message);
 }
 
+TEST_F(TCPServerSocketTest, Rebind) {
+  IPEndPoint address;
+  // Bind to a random, unused port.
+  ParseAddress("127.0.0.1", 0, &address);
+
+  scoped_ptr<TCPServerSocket> socket(
+      new TCPServerSocket(NULL, NetLog::Source()));
+  ASSERT_EQ(OK, socket->Listen(address, kListenBacklog));
+
+  // Retrieve the real endpoint bound.
+  ASSERT_EQ(OK, socket->GetLocalAddress(&address));
+
+  scoped_ptr<TCPServerSocket> conflict_socket(
+      new TCPServerSocket(NULL, NetLog::Source()));
+  ASSERT_NE(OK, conflict_socket->Listen(address, kListenBacklog));
+
+  // Unbind.
+  socket.reset(NULL);
+
+  ASSERT_EQ(OK, conflict_socket->Listen(address, kListenBacklog));
+}
+
 }  // namespace
 
 }  // namespace net