net/socket/tcp_client_socket_unittest.cc - chromium/src.git - Git at Google

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "net/socket/tcp_client_socket.h"

 #include "base/basictypes.h"
 #include "net/base/address_list.h"
 #include "net/base/host_resolver.h"
 #include "net/base/io_buffer.h"
 #include "net/base/listen_socket.h"
 #include "net/base/net_log.h"
 #include "net/base/net_log_unittest.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/base/winsock_init.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"

 namespace net {

 namespace {

 const char kServerReply[] = "HTTP/1.1 404 Not Found";

 class TCPClientSocketTest
     : public PlatformTest, public ListenSocket::ListenSocketDelegate {
  public:
   TCPClientSocketTest()
       : listen_port_(0),
         net_log_(CapturingNetLog::kUnbounded) {
   }

   // Implement ListenSocketDelegate methods
   virtual void DidAccept(ListenSocket* server, ListenSocket* connection) {
     connected_sock_ = connection;
   }
   virtual void DidRead(ListenSocket*, const char* str, int len) {
     // TODO(dkegel): this might not be long enough to tickle some bugs.
     connected_sock_->Send(kServerReply,
                           arraysize(kServerReply) - 1,
                           false /* don't append line feed */);
   }
   virtual void DidClose(ListenSocket* sock) {}

   // Testcase hooks
   virtual void SetUp();

   void CloseServerSocket() {
     // delete the connected_sock_, which will close it.
     connected_sock_ = NULL;
   }

   void PauseServerReads() {
     connected_sock_->PauseReads();
   }

   void ResumeServerReads() {
     connected_sock_->ResumeReads();
   }

  protected:
   int listen_port_;
   CapturingNetLog net_log_;
   scoped_ptr<TCPClientSocket> sock_;

  private:
   scoped_refptr<ListenSocket> listen_sock_;
   scoped_refptr<ListenSocket> connected_sock_;
 };

 void TCPClientSocketTest::SetUp() {
   PlatformTest::SetUp();

   // Find a free port to listen on
   ListenSocket *sock = NULL;
   int port;
   // Range of ports to listen on.  Shouldn't need to try many.
   const int kMinPort = 10100;
   const int kMaxPort = 10200;
 #if defined(OS_WIN)
   EnsureWinsockInit();
 #endif
   for (port = kMinPort; port < kMaxPort; port++) {
     sock = ListenSocket::Listen("127.0.0.1", port, this);
     if (sock)
       break;
   }
   ASSERT_TRUE(sock != NULL);
   listen_sock_ = sock;
   listen_port_ = port;

   AddressList addr;
   scoped_refptr<HostResolver> resolver(
       CreateSystemHostResolver(HostResolver::kDefaultParallelism,
                                NULL));
   HostResolver::RequestInfo info("localhost", listen_port_);
   int rv = resolver->Resolve(info, &addr, NULL, NULL, BoundNetLog());
   CHECK_EQ(rv, OK);
   sock_.reset(new TCPClientSocket(addr, &net_log_, NetLog::Source()));
 }

 TEST_F(TCPClientSocketTest, Connect) {
   TestCompletionCallback callback;
   EXPECT_FALSE(sock_->IsConnected());

   int rv = sock_->Connect(&callback);
   EXPECT_TRUE(net::LogContainsBeginEvent(
       net_log_.entries(), 0, net::NetLog::TYPE_SOCKET_ALIVE));
   EXPECT_TRUE(net::LogContainsBeginEvent(
       net_log_.entries(), 1, net::NetLog::TYPE_TCP_CONNECT));
   if (rv != OK) {
     ASSERT_EQ(rv, ERR_IO_PENDING);
     rv = callback.WaitForResult();
     EXPECT_EQ(rv, OK);
   }

   EXPECT_TRUE(sock_->IsConnected());
   EXPECT_TRUE(net::LogContainsEndEvent(
       net_log_.entries(), -1, net::NetLog::TYPE_TCP_CONNECT));

   sock_->Disconnect();
   EXPECT_FALSE(sock_->IsConnected());
 }

 // TODO(wtc): Add unit tests for IsConnectedAndIdle:
 //   - Server closes a connection.
 //   - Server sends data unexpectedly.

 TEST_F(TCPClientSocketTest, Read) {
   TestCompletionCallback callback;
   int rv = sock_->Connect(&callback);
   if (rv != OK) {
     ASSERT_EQ(rv, ERR_IO_PENDING);

     rv = callback.WaitForResult();
     EXPECT_EQ(rv, OK);
   }

   const char request_text[] = "GET / HTTP/1.0\r\n\r\n";
   scoped_refptr<IOBuffer> request_buffer =
       new IOBuffer(arraysize(request_text) - 1);
   memcpy(request_buffer->data(), request_text, arraysize(request_text) - 1);

   rv = sock_->Write(request_buffer, arraysize(request_text) - 1, &callback);
   EXPECT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);

   if (rv == ERR_IO_PENDING) {
     rv = callback.WaitForResult();
     EXPECT_EQ(rv, static_cast<int>(arraysize(request_text) - 1));
   }

   scoped_refptr<IOBuffer> buf = new IOBuffer(4096);
   uint32 bytes_read = 0;
   while (bytes_read < arraysize(kServerReply) - 1) {
     rv = sock_->Read(buf, 4096, &callback);
     EXPECT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);

     if (rv == ERR_IO_PENDING)
       rv = callback.WaitForResult();

     ASSERT_GE(rv, 0);
     bytes_read += rv;
   }

   // All data has been read now.  Read once more to force an ERR_IO_PENDING, and
   // then close the server socket, and note the close.

   rv = sock_->Read(buf, 4096, &callback);
   ASSERT_EQ(ERR_IO_PENDING, rv);
   CloseServerSocket();
   EXPECT_EQ(0, callback.WaitForResult());
 }

 TEST_F(TCPClientSocketTest, Read_SmallChunks) {
   TestCompletionCallback callback;
   int rv = sock_->Connect(&callback);
   if (rv != OK) {
     ASSERT_EQ(rv, ERR_IO_PENDING);

     rv = callback.WaitForResult();
     EXPECT_EQ(rv, OK);
   }

   const char request_text[] = "GET / HTTP/1.0\r\n\r\n";
   scoped_refptr<IOBuffer> request_buffer =
       new IOBuffer(arraysize(request_text) - 1);
   memcpy(request_buffer->data(), request_text, arraysize(request_text) - 1);

   rv = sock_->Write(request_buffer, arraysize(request_text) - 1, &callback);
   EXPECT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);

   if (rv == ERR_IO_PENDING) {
     rv = callback.WaitForResult();
     EXPECT_EQ(rv, static_cast<int>(arraysize(request_text) - 1));
   }

   scoped_refptr<IOBuffer> buf = new IOBuffer(1);
   uint32 bytes_read = 0;
   while (bytes_read < arraysize(kServerReply) - 1) {
     rv = sock_->Read(buf, 1, &callback);
     EXPECT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);

     if (rv == ERR_IO_PENDING)
       rv = callback.WaitForResult();

     ASSERT_EQ(1, rv);
     bytes_read += rv;
   }

   // All data has been read now.  Read once more to force an ERR_IO_PENDING, and
   // then close the server socket, and note the close.

   rv = sock_->Read(buf, 1, &callback);
   ASSERT_EQ(ERR_IO_PENDING, rv);
   CloseServerSocket();
   EXPECT_EQ(0, callback.WaitForResult());
 }

 TEST_F(TCPClientSocketTest, Read_Interrupted) {
   TestCompletionCallback callback;
   int rv = sock_->Connect(&callback);
   if (rv != OK) {
     ASSERT_EQ(ERR_IO_PENDING, rv);

     rv = callback.WaitForResult();
     EXPECT_EQ(rv, OK);
   }

   const char request_text[] = "GET / HTTP/1.0\r\n\r\n";
   scoped_refptr<IOBuffer> request_buffer =
       new IOBuffer(arraysize(request_text) - 1);
   memcpy(request_buffer->data(), request_text, arraysize(request_text) - 1);

   rv = sock_->Write(request_buffer, arraysize(request_text) - 1, &callback);
   EXPECT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);

   if (rv == ERR_IO_PENDING) {
     rv = callback.WaitForResult();
     EXPECT_EQ(rv, static_cast<int>(arraysize(request_text) - 1));
   }

   // Do a partial read and then exit.  This test should not crash!
   scoped_refptr<IOBuffer> buf = new IOBuffer(16);
   rv = sock_->Read(buf, 16, &callback);
   EXPECT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);

   if (rv == ERR_IO_PENDING)
     rv = callback.WaitForResult();

   EXPECT_NE(0, rv);
 }

 TEST_F(TCPClientSocketTest, DISABLED_FullDuplex_ReadFirst) {
   TestCompletionCallback callback;
   int rv = sock_->Connect(&callback);
   if (rv != OK) {
     ASSERT_EQ(rv, ERR_IO_PENDING);

     rv = callback.WaitForResult();
     EXPECT_EQ(rv, OK);
   }

   // Read first.  There's no data, so it should return ERR_IO_PENDING.
   const int kBufLen = 4096;
   scoped_refptr<IOBuffer> buf = new IOBuffer(kBufLen);
   rv = sock_->Read(buf, kBufLen, &callback);
   EXPECT_EQ(ERR_IO_PENDING, rv);

   PauseServerReads();
   const int kWriteBufLen = 64 * 1024;
   scoped_refptr<IOBuffer> request_buffer = new IOBuffer(kWriteBufLen);
   char* request_data = request_buffer->data();
   memset(request_data, 'A', kWriteBufLen);
   TestCompletionCallback write_callback;

   while (true) {
     rv = sock_->Write(request_buffer, kWriteBufLen, &write_callback);
     ASSERT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);

     if (rv == ERR_IO_PENDING) {
       ResumeServerReads();
       rv = write_callback.WaitForResult();
       break;
     }
   }

   // At this point, both read and write have returned ERR_IO_PENDING, and the
   // write callback has executed.  We wait for the read callback to run now to
   // make sure that the socket can handle full duplex communications.

   rv = callback.WaitForResult();
   EXPECT_GE(rv, 0);
 }

 TEST_F(TCPClientSocketTest, DISABLED_FullDuplex_WriteFirst) {
   TestCompletionCallback callback;
   int rv = sock_->Connect(&callback);
   if (rv != OK) {
     ASSERT_EQ(ERR_IO_PENDING, rv);

     rv = callback.WaitForResult();
     EXPECT_EQ(OK, rv);
   }

   PauseServerReads();
   const int kWriteBufLen = 64 * 1024;
   scoped_refptr<IOBuffer> request_buffer = new IOBuffer(kWriteBufLen);
   char* request_data = request_buffer->data();
   memset(request_data, 'A', kWriteBufLen);
   TestCompletionCallback write_callback;

   while (true) {
     rv = sock_->Write(request_buffer, kWriteBufLen, &write_callback);
     ASSERT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);

     if (rv == ERR_IO_PENDING)
       break;
   }

   // Now we have the Write() blocked on ERR_IO_PENDING.  It's time to force the
   // Read() to block on ERR_IO_PENDING too.

   const int kBufLen = 4096;
   scoped_refptr<IOBuffer> buf = new IOBuffer(kBufLen);
   while (true) {
     rv = sock_->Read(buf, kBufLen, &callback);
     ASSERT_TRUE(rv >= 0 || rv == ERR_IO_PENDING);
     if (rv == ERR_IO_PENDING)
       break;
   }

   // At this point, both read and write have returned ERR_IO_PENDING.  Now we
   // run the write and read callbacks to make sure they can handle full duplex
   // communications.

   ResumeServerReads();
   rv = write_callback.WaitForResult();
   EXPECT_GE(rv, 0);

   // It's possible the read is blocked because it's already read all the data.
   // Close the server socket, so there will at least be a 0-byte read.
   CloseServerSocket();

   rv = callback.WaitForResult();
   EXPECT_GE(rv, 0);
 }

 }  // namespace

 }  // namespace net
	// Copyright (c) 2010 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "net/socket/tcp_client_socket.h"

	#include "base/basictypes.h"
	#include "net/base/address_list.h"
	#include "net/base/host_resolver.h"
	#include "net/base/io_buffer.h"
	#include "net/base/listen_socket.h"
	#include "net/base/net_log.h"
	#include "net/base/net_log_unittest.h"
	#include "net/base/net_errors.h"
	#include "net/base/test_completion_callback.h"
	#include "net/base/winsock_init.h"
	#include "testing/gtest/include/gtest/gtest.h"
	#include "testing/platform_test.h"

	namespace net {

	namespace {

	const char kServerReply[] = "HTTP/1.1 404 Not Found";

	class TCPClientSocketTest
	: public PlatformTest, public ListenSocket::ListenSocketDelegate {
	public:
	TCPClientSocketTest()
	: listen_port_(0),
	net_log_(CapturingNetLog::kUnbounded) {
	}

	// Implement ListenSocketDelegate methods
	virtual void DidAccept(ListenSocket* server, ListenSocket* connection) {
	connected_sock_ = connection;
	}
	virtual void DidRead(ListenSocket, const char str, int len) {
	// TODO(dkegel): this might not be long enough to tickle some bugs.
	connected_sock_->Send(kServerReply,
	arraysize(kServerReply) - 1,
	false /* don't append line feed */);
	}
	virtual void DidClose(ListenSocket* sock) {}

	// Testcase hooks
	virtual void SetUp();

	void CloseServerSocket() {
	// delete the connected_sock_, which will close it.
	connected_sock_ = NULL;
	}

	void PauseServerReads() {
	connected_sock_->PauseReads();
	}

	void ResumeServerReads() {
	connected_sock_->ResumeReads();
	}

	protected:
	int listen_port_;
	CapturingNetLog net_log_;
	scoped_ptr<TCPClientSocket> sock_;

	private:
	scoped_refptr<ListenSocket> listen_sock_;
	scoped_refptr<ListenSocket> connected_sock_;
	};

	void TCPClientSocketTest::SetUp() {
	PlatformTest::SetUp();

	// Find a free port to listen on
	ListenSocket *sock = NULL;
	int port;
	// Range of ports to listen on. Shouldn't need to try many.
	const int kMinPort = 10100;
	const int kMaxPort = 10200;
	#if defined(OS_WIN)
	EnsureWinsockInit();
	#endif
	for (port = kMinPort; port < kMaxPort; port++) {
	sock = ListenSocket::Listen("127.0.0.1", port, this);
	if (sock)
	break;
	}
	ASSERT_TRUE(sock != NULL);
	listen_sock_ = sock;
	listen_port_ = port;

	AddressList addr;
	scoped_refptr<HostResolver> resolver(
	CreateSystemHostResolver(HostResolver::kDefaultParallelism,
	NULL));
	HostResolver::RequestInfo info("localhost", listen_port_);
	int rv = resolver->Resolve(info, &addr, NULL, NULL, BoundNetLog());
	CHECK_EQ(rv, OK);
	sock_.reset(new TCPClientSocket(addr, &net_log_, NetLog::Source()));
	}

	TEST_F(TCPClientSocketTest, Connect) {
	TestCompletionCallback callback;
	EXPECT_FALSE(sock_->IsConnected());

	int rv = sock_->Connect(&callback);
	EXPECT_TRUE(net::LogContainsBeginEvent(
	net_log_.entries(), 0, net::NetLog::TYPE_SOCKET_ALIVE));
	EXPECT_TRUE(net::LogContainsBeginEvent(
	net_log_.entries(), 1, net::NetLog::TYPE_TCP_CONNECT));
	if (rv != OK) {
	ASSERT_EQ(rv, ERR_IO_PENDING);
	rv = callback.WaitForResult();
	EXPECT_EQ(rv, OK);
	}

	EXPECT_TRUE(sock_->IsConnected());
	EXPECT_TRUE(net::LogContainsEndEvent(
	net_log_.entries(), -1, net::NetLog::TYPE_TCP_CONNECT));

	sock_->Disconnect();
	EXPECT_FALSE(sock_->IsConnected());
	}

	// TODO(wtc): Add unit tests for IsConnectedAndIdle:
	// - Server closes a connection.
	// - Server sends data unexpectedly.

	TEST_F(TCPClientSocketTest, Read) {
	TestCompletionCallback callback;
	int rv = sock_->Connect(&callback);
	if (rv != OK) {
	ASSERT_EQ(rv, ERR_IO_PENDING);

	rv = callback.WaitForResult();
	EXPECT_EQ(rv, OK);
	}

	const char request_text[] = "GET / HTTP/1.0\r\n\r\n";
	scoped_refptr<IOBuffer> request_buffer =
	new IOBuffer(arraysize(request_text) - 1);
	memcpy(request_buffer->data(), request_text, arraysize(request_text) - 1);

	rv = sock_->Write(request_buffer, arraysize(request_text) - 1, &callback);
	EXPECT_TRUE(rv >= 0 \|\| rv == ERR_IO_PENDING);

	if (rv == ERR_IO_PENDING) {
	rv = callback.WaitForResult();
	EXPECT_EQ(rv, static_cast<int>(arraysize(request_text) - 1));
	}

	scoped_refptr<IOBuffer> buf = new IOBuffer(4096);
	uint32 bytes_read = 0;
	while (bytes_read < arraysize(kServerReply) - 1) {
	rv = sock_->Read(buf, 4096, &callback);
	EXPECT_TRUE(rv >= 0 \|\| rv == ERR_IO_PENDING);

	if (rv == ERR_IO_PENDING)
	rv = callback.WaitForResult();

	ASSERT_GE(rv, 0);
	bytes_read += rv;
	}

	// All data has been read now. Read once more to force an ERR_IO_PENDING, and
	// then close the server socket, and note the close.

	rv = sock_->Read(buf, 4096, &callback);
	ASSERT_EQ(ERR_IO_PENDING, rv);
	CloseServerSocket();
	EXPECT_EQ(0, callback.WaitForResult());
	}

	TEST_F(TCPClientSocketTest, Read_SmallChunks) {
	TestCompletionCallback callback;
	int rv = sock_->Connect(&callback);
	if (rv != OK) {
	ASSERT_EQ(rv, ERR_IO_PENDING);

	rv = callback.WaitForResult();
	EXPECT_EQ(rv, OK);
	}

	const char request_text[] = "GET / HTTP/1.0\r\n\r\n";
	scoped_refptr<IOBuffer> request_buffer =
	new IOBuffer(arraysize(request_text) - 1);
	memcpy(request_buffer->data(), request_text, arraysize(request_text) - 1);

	rv = sock_->Write(request_buffer, arraysize(request_text) - 1, &callback);
	EXPECT_TRUE(rv >= 0 \|\| rv == ERR_IO_PENDING);

	if (rv == ERR_IO_PENDING) {
	rv = callback.WaitForResult();
	EXPECT_EQ(rv, static_cast<int>(arraysize(request_text) - 1));
	}

	scoped_refptr<IOBuffer> buf = new IOBuffer(1);
	uint32 bytes_read = 0;
	while (bytes_read < arraysize(kServerReply) - 1) {
	rv = sock_->Read(buf, 1, &callback);
	EXPECT_TRUE(rv >= 0 \|\| rv == ERR_IO_PENDING);

	if (rv == ERR_IO_PENDING)
	rv = callback.WaitForResult();

	ASSERT_EQ(1, rv);
	bytes_read += rv;
	}

	// All data has been read now. Read once more to force an ERR_IO_PENDING, and
	// then close the server socket, and note the close.

	rv = sock_->Read(buf, 1, &callback);
	ASSERT_EQ(ERR_IO_PENDING, rv);
	CloseServerSocket();
	EXPECT_EQ(0, callback.WaitForResult());
	}

	TEST_F(TCPClientSocketTest, Read_Interrupted) {
	TestCompletionCallback callback;
	int rv = sock_->Connect(&callback);
	if (rv != OK) {
	ASSERT_EQ(ERR_IO_PENDING, rv);

	rv = callback.WaitForResult();
	EXPECT_EQ(rv, OK);
	}

	const char request_text[] = "GET / HTTP/1.0\r\n\r\n";
	scoped_refptr<IOBuffer> request_buffer =
	new IOBuffer(arraysize(request_text) - 1);
	memcpy(request_buffer->data(), request_text, arraysize(request_text) - 1);

	rv = sock_->Write(request_buffer, arraysize(request_text) - 1, &callback);
	EXPECT_TRUE(rv >= 0 \|\| rv == ERR_IO_PENDING);

	if (rv == ERR_IO_PENDING) {
	rv = callback.WaitForResult();
	EXPECT_EQ(rv, static_cast<int>(arraysize(request_text) - 1));
	}

	// Do a partial read and then exit. This test should not crash!
	scoped_refptr<IOBuffer> buf = new IOBuffer(16);
	rv = sock_->Read(buf, 16, &callback);
	EXPECT_TRUE(rv >= 0 \|\| rv == ERR_IO_PENDING);

	if (rv == ERR_IO_PENDING)
	rv = callback.WaitForResult();

	EXPECT_NE(0, rv);
	}

	TEST_F(TCPClientSocketTest, DISABLED_FullDuplex_ReadFirst) {
	TestCompletionCallback callback;
	int rv = sock_->Connect(&callback);
	if (rv != OK) {
	ASSERT_EQ(rv, ERR_IO_PENDING);

	rv = callback.WaitForResult();
	EXPECT_EQ(rv, OK);
	}

	// Read first. There's no data, so it should return ERR_IO_PENDING.
	const int kBufLen = 4096;
	scoped_refptr<IOBuffer> buf = new IOBuffer(kBufLen);
	rv = sock_->Read(buf, kBufLen, &callback);
	EXPECT_EQ(ERR_IO_PENDING, rv);

	PauseServerReads();
	const int kWriteBufLen = 64 * 1024;
	scoped_refptr<IOBuffer> request_buffer = new IOBuffer(kWriteBufLen);
	char* request_data = request_buffer->data();
	memset(request_data, 'A', kWriteBufLen);
	TestCompletionCallback write_callback;

	while (true) {
	rv = sock_->Write(request_buffer, kWriteBufLen, &write_callback);
	ASSERT_TRUE(rv >= 0 \|\| rv == ERR_IO_PENDING);

	if (rv == ERR_IO_PENDING) {
	ResumeServerReads();
	rv = write_callback.WaitForResult();
	break;
	}
	}

	// At this point, both read and write have returned ERR_IO_PENDING, and the
	// write callback has executed. We wait for the read callback to run now to
	// make sure that the socket can handle full duplex communications.

	rv = callback.WaitForResult();
	EXPECT_GE(rv, 0);
	}

	TEST_F(TCPClientSocketTest, DISABLED_FullDuplex_WriteFirst) {
	TestCompletionCallback callback;
	int rv = sock_->Connect(&callback);
	if (rv != OK) {
	ASSERT_EQ(ERR_IO_PENDING, rv);

	rv = callback.WaitForResult();
	EXPECT_EQ(OK, rv);
	}

	PauseServerReads();
	const int kWriteBufLen = 64 * 1024;
	scoped_refptr<IOBuffer> request_buffer = new IOBuffer(kWriteBufLen);
	char* request_data = request_buffer->data();
	memset(request_data, 'A', kWriteBufLen);
	TestCompletionCallback write_callback;

	while (true) {
	rv = sock_->Write(request_buffer, kWriteBufLen, &write_callback);
	ASSERT_TRUE(rv >= 0 \|\| rv == ERR_IO_PENDING);

	if (rv == ERR_IO_PENDING)
	break;
	}

	// Now we have the Write() blocked on ERR_IO_PENDING. It's time to force the
	// Read() to block on ERR_IO_PENDING too.

	const int kBufLen = 4096;
	scoped_refptr<IOBuffer> buf = new IOBuffer(kBufLen);
	while (true) {
	rv = sock_->Read(buf, kBufLen, &callback);
	ASSERT_TRUE(rv >= 0 \|\| rv == ERR_IO_PENDING);
	if (rv == ERR_IO_PENDING)
	break;
	}

	// At this point, both read and write have returned ERR_IO_PENDING. Now we
	// run the write and read callbacks to make sure they can handle full duplex
	// communications.

	ResumeServerReads();
	rv = write_callback.WaitForResult();
	EXPECT_GE(rv, 0);

	// It's possible the read is blocked because it's already read all the data.
	// Close the server socket, so there will at least be a 0-byte read.
	CloseServerSocket();

	rv = callback.WaitForResult();
	EXPECT_GE(rv, 0);
	}

	} // namespace

	} // namespace net