WebSocketChannel implementation

net/websockets/websocket_channel_test.cc

Index: net/websockets/websocket_channel_test.cc
diff --git a/net/websockets/websocket_channel_test.cc b/net/websockets/websocket_channel_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..dfa75e6e73d567d44df9376f4f0a713de7e8eb0b
--- /dev/null
+++ b/net/websockets/websocket_channel_test.cc
@@ -0,0 +1,1167 @@
+// Copyright 2013 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/websockets/websocket_channel.h"
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "base/message_loop/message_loop.h"
+#include "base/strings/string_piece.h"
+#include "googleurl/src/gurl.h"
+#include "net/base/net_errors.h"
+#include "net/url_request/url_request_context.h"
+#include "net/websockets/websocket_errors.h"
+#include "net/websockets/websocket_event_interface.h"
+#include "net/websockets/websocket_mux.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+// Printing helpers to allow GoogleMock to print frame chunks. These are
+// explicitly designed to look like the static initialisation format we use in
+// these tests. Static to reduce the risk of linker clashes.
+
+static std::ostream& operator<<(std::ostream& os,
+                                const WebSocketFrameHeader& header) {
+  return os << "{" << (header.final ? "FINAL_FRAME" : "NOT_FINAL_FRAME") << ", "
+            << header.opcode << ", "
+            << (header.masked ? "MASKED" : "NOT_MASKED") << ", "
+            << header.payload_length << "}";
+}
+
+static std::ostream& operator<<(std::ostream& os,
+                                const WebSocketFrameChunk& chunk) {
+  os << "{";
+  if (chunk.header) {
+    os << *chunk.header;
+  } else {
+    os << "{NO_HEADER}";
+  }
+  return os << ", " << (chunk.final_chunk ? "FINAL_CHUNK" : "NOT_FINAL_CHUNK")
+            << ", \"" << base::StringPiece(chunk.data->data(),
+                                           chunk.data->size()) << "\"}";
+}
+
+namespace {
+
+using ::testing::AnyNumber;
+using ::testing::Field;
+using ::testing::InSequence;
+using ::testing::MockFunction;
+using ::testing::Pointee;
+using ::testing::Return;
+using ::testing::_;
+
+// This mock is for testing expectations about how the EventInterface is used.
+class MockWebSocketEventInterface : public WebSocketEventInterface {
+ public:
+  MOCK_METHOD2(OnAddChannelResponse, void(bool, const std::string&));
+  MOCK_METHOD3(OnDataFrame,
+               void(bool, WebSocketMessageType, const std::vector<char>&));
+  MOCK_METHOD1(OnFlowControl, void(int64));
+  MOCK_METHOD0(OnClosingHandshake, void(void));
+  MOCK_METHOD2(OnDropChannel, void(uint16, const std::string&));
+};
+
+// This fake EventInterface is for tests which need a WebSocketEventInterface
+// implementation but are not verifying how it is used.
+class FakeWebSocketEventInterface : public WebSocketEventInterface {
+  virtual void OnAddChannelResponse(bool fail,
+                                    const std::string& selected_protocol)
+      OVERRIDE {}
+  virtual void OnDataFrame(bool fin,
+                           WebSocketMessageType type,
+                           const std::vector<char>& data) OVERRIDE {}
+  virtual void OnFlowControl(int64 quota) OVERRIDE {}
+  virtual void OnClosingHandshake() OVERRIDE {}
+  virtual void OnDropChannel(uint16 code, const std::string& reason) OVERRIDE {}
+};
+
+// This fake WebSocketStream is for tests that require a WebSocketStream but are
+// not testing the way it is used. It has minimal functionality to return
+// the |protocol| and |extensions| that it was constructed with.
+class FakeWebSocketStream : public WebSocketStream {
+ public:
+  // Constructs with empty protocol and extensions.
+  FakeWebSocketStream() : WebSocketStream(), protocol_(), extensions_() {}
+
+  // Constructs with specified protocol and extensions.
+  FakeWebSocketStream(const std::string& protocol,
+                      const std::string& extensions)
+      : WebSocketStream(), protocol_(protocol), extensions_(extensions) {}
+
+  virtual int SendHandshakeRequest(const GURL& url,
+                                   const HttpRequestHeaders& headers,
+                                   HttpResponseInfo* response_info,
+                                   const CompletionCallback& callback)
+      OVERRIDE {
+    return ERR_IO_PENDING;
+  }
+
+  virtual int ReadHandshakeResponse(const CompletionCallback& callback)
+      OVERRIDE {
+    return ERR_IO_PENDING;
+  }
+
+  virtual int ReadFrames(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                         const CompletionCallback& callback) OVERRIDE {
+    return ERR_IO_PENDING;
+  }
+
+  virtual int WriteFrames(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                          const CompletionCallback& callback) OVERRIDE {
+    return ERR_IO_PENDING;
+  }
+
+  virtual void Close() OVERRIDE {}
+
+  // Returns the string passed to the constructor.
+  virtual std::string GetSubProtocol() const OVERRIDE { return protocol_; }
+
+  // Returns the string passed to the constructor.
+  virtual std::string GetExtensions() const OVERRIDE { return extensions_; }
+
+ private:
+  // The string to return from GetSubProtocol().
+  std::string protocol_;
+
+  // The string to return from GetExtensions().
+  std::string extensions_;
+};
+
+// To make the static initialisers easier to read, we use enums rather than
+// bools.
+
+// NO_HEADER means there shouldn't be a header included in the generated
+// WebSocketFrameChunk. The static initialiser always has a header, but we can
+// avoid specifying the rest of the fields.
+enum IsFinal {
+  NO_HEADER,
+  NOT_FINAL_FRAME,
+  FINAL_FRAME
+};
+
+enum IsMasked {
+  NOT_MASKED,
+  MASKED
+};
+
+enum IsFinalChunk {
+  NOT_FINAL_CHUNK,
+  FINAL_CHUNK
+};
+
+// This is used to initialise a WebSocketFrameChunk but is statically
+// initialisable.
+struct InitFrameChunk {
+  struct FrameHeader {
+    IsFinal final;
+    // Reserved fields omitted for now. Add them if you need them.
+    WebSocketFrameHeader::OpCode opcode;
+    IsMasked masked;
+    // payload_length is the length of the whole frame. The length of the data
+    // members from every chunk in the frame must add up to the payload_length.
+    uint64 payload_length;
+  };
+  FrameHeader header;
+
+  // Directly equivalent to WebSocketFrameChunk::final_chunk
+  IsFinalChunk final_chunk;
+
+  // Will be used to create the IOBuffer member. Can be NULL for NULL data. Is a
+  // nul-terminated string for ease-of-use. This means it is not 8-bit clean,
+  // but this is not an issue for test data.
+  const char* const data;
+};
+
+// Convert a const array of InitFrameChunks to the format used at
+// runtime. Templated on the size of the array to save typing.
+template <size_t N>
+ScopedVector<WebSocketFrameChunk> CreateFrameChunkVector(
+    const InitFrameChunk (&source_chunks)[N]) {
+  ScopedVector<WebSocketFrameChunk> result_chunks;
+  result_chunks.reserve(N);
+  for (size_t i = 0; i < N; ++i) {
+    scoped_ptr<WebSocketFrameChunk> result_chunk(new WebSocketFrameChunk);
+    size_t chunk_length =
+        source_chunks[i].data ? strlen(source_chunks[i].data) : 0;
+    if (source_chunks[i].header.final != NO_HEADER) {
+      const InitFrameChunk::FrameHeader& source_header =
+          source_chunks[i].header;
+      scoped_ptr<WebSocketFrameHeader> result_header(
+          new WebSocketFrameHeader(source_header.opcode));
+      result_header->final = source_header.final == FINAL_FRAME;

[szym, 2013/07/12 17:44:51]

nit: parens would help

[Adam Rice, 2013/07/12 20:46:55]

I was getting kind of an anti-params vibe from the style guide, so I didn't put
any in. Thank you for giving me an excuse to add them.

[szym, 2013/07/12 21:03:22]

Maybe it's my eyes, but while I have no problem with 
result = a < b;
I do need to stare a bit at:
result = a == b;

+      result_header->opcode = source_header.opcode;
+      result_header->masked = source_header.masked == MASKED;

[szym, 2013/07/12 17:44:51]

ditto

[Adam Rice, 2013/07/12 20:46:55]

Done.

+      result_header->payload_length = source_header.payload_length;
+      DCHECK(chunk_length <= source_header.payload_length);
+      result_chunk->header.swap(result_header);
+    }
+    result_chunk->final_chunk = source_chunks[i].final_chunk == FINAL_CHUNK;

[szym, 2013/07/12 17:44:51]

ditto

[Adam Rice, 2013/07/12 20:46:55]

Done.

+    if (source_chunks[i].data) {
+      result_chunk->data = new IOBufferWithSize(chunk_length);
+      memcpy(result_chunk->data->data(), source_chunks[i].data, chunk_length);
+    }
+    result_chunks.push_back(result_chunk.release());
+  }
+  return result_chunks.Pass();
+}
+
+// A GoogleMock action which can be used to respond to call to ReadFrames with
+// some frames. Use like ReadFrames(_, _).WillOnce(ReturnChunks(chunks));
+ACTION_P(ReturnChunks, source_chunks) {
+  *arg0 = CreateFrameChunkVector(source_chunks);
+  return OK;
+}
+
+// A FakeWebSocketStream whose ReadFrames() function returns data.
+class ReadableFakeWebSocketStream : public FakeWebSocketStream {
+ public:
+  enum IsSync {
+    SYNC,
+    ASYNC
+  };
+
+  // After constructing the object, call PrepareReadFrames() once for each
+  // time you wish it to return from the test.
+  ReadableFakeWebSocketStream()
+      : FakeWebSocketStream(), responses_(), index_(0) {}
+
+  // Prepares a fake responses. Fake responses will be returned from
+  // ReadFrames() in the same order they were prepared with PrepareReadFrames()
+  // and PrepareReadFramesError(). If |async| is ASYNC, then ReadFrames() will
+  // return ERR_IO_PENDING and the callback will be scheduled to run on the
+  // message loop. This requires the test case to run the message loop. If
+  // |async| is SYNC, the response will be returned synchronously. |error| is
+  // returned directly from ReadFrames() in the synchronous case, or passed to
+  // the callback in the asynchronous case. |chunks| will be converted to a
+  // ScopedVector<WebSocketFrameChunks> and copied to the pointer that was
+  // passed to ReadFrames().
+  template <size_t N>
+  void PrepareReadFrames(IsSync async,
+                         int error,
+                         const InitFrameChunk (&chunks)[N]) {
+    responses_.push_back(
+        new Response(async, error, CreateFrameChunkVector(chunks)));
+  }
+
+  // Prepares a fake error response (ie. there is no data).
+  void PrepareReadFramesError(IsSync async, int error) {
+    responses_.push_back(
+        new Response(async, error, ScopedVector<WebSocketFrameChunk>()));
+  }
+
+  virtual int ReadFrames(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                         const CompletionCallback& callback) OVERRIDE {

[szym, 2013/07/12 17:44:51]

Maybe add some check that this is not called while ReadFrames is pending.

[Adam Rice, 2013/07/12 20:46:55]

Done.

+    if (index_ >= responses_.size()) {
+      return ERR_IO_PENDING;
+    }

[szym, 2013/07/12 17:44:51]

nit: no need for {}

[Adam Rice, 2013/07/12 20:46:55]

Done.

+    if (responses_[index_]->async == ASYNC) {
+      base::MessageLoop::current()->PostTask(
+          FROM_HERE,
+          base::Bind(&ReadableFakeWebSocketStream::DoCallback,
+                     base::Unretained(this),

[szym, 2013/07/12 17:44:51]

To avoid confusing use-after-free I suggest adding a CHECK in the dtor that
|index_| is at the end of |responses_|.

[Adam Rice, 2013/07/12 20:46:55]

Done.

+                     frame_chunks,
+                     callback));
+      return ERR_IO_PENDING;
+    } else {
+      frame_chunks->swap(responses_[index_]->chunks);
+      return responses_[index_++]->error;
+    }
+  }
+
+ private:
+  void DoCallback(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                  const CompletionCallback& callback) {
+    frame_chunks->swap(responses_[index_]->chunks);
+    callback.Run(responses_[index_++]->error);
+    return;
+  }
+
+  struct Response {
+    Response(IsSync async, int error, ScopedVector<WebSocketFrameChunk> chunks)
+        : async(async), error(error), chunks(chunks.Pass()) {}
+
+    IsSync async;
+    int error;
+    ScopedVector<WebSocketFrameChunk> chunks;
+
+   private:
+    // Bad things will happen if we attempt to copy or assign "chunks".
+    DISALLOW_COPY_AND_ASSIGN(Response);
+  };
+  ScopedVector<Response> responses_;
+  size_t index_;
+};
+
+// A FakeWebSocketStream where writes always complete successfully and
+// synchronously.
+class WriteableFakeWebSocketStream : public FakeWebSocketStream {
+ public:
+  virtual int WriteFrames(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                          const CompletionCallback& callback) OVERRIDE {
+    return OK;
+  }
+};
+
+// A FakeWebSocketStream where writes always fail.
+class UnWriteableFakeWebSocketStream : public FakeWebSocketStream {
+ public:
+  virtual int WriteFrames(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                          const CompletionCallback& callback) OVERRIDE {
+    return ERR_CONNECTION_RESET;
+  }
+};
+
+// A FakeWebSocketStream which echoes any frames written back. It unset the

[szym, 2013/07/12 17:44:51]

"It unset" => "Clears"

[Adam Rice, 2013/07/12 20:46:55]

Done.

+// "masked" header bit, but makes no other checks for validity. Tests using this
+// must run the MessageLoop to receive the callback(s). If a message with opcode
+// Close is echoed, then an ERR_CONNECTION_CLOSED is returned in the next
+// callback. The test must do something to cause WriteFrames() to be called,
+// otherwise the ReadFrames() callback will never be called.
+class EchoeyFakeWebSocketStream : public FakeWebSocketStream {
+ public:
+  EchoeyFakeWebSocketStream() : read_frame_chunks_(NULL), done_(false) {}
+
+  virtual int WriteFrames(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                          const CompletionCallback& callback) OVERRIDE {
+    // Users of WebSocketStream will not expect the ReadFrames() callback to be
+    // called from within WriteFrames(), so post it to the message loop instead.
+    stored_frame_chunks_.insert(
+        stored_frame_chunks_.end(), frame_chunks->begin(), frame_chunks->end());
+    frame_chunks->weak_clear();
+    PostCallback();
+    return OK;
+  }
+
+  virtual int ReadFrames(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                         const CompletionCallback& callback) OVERRIDE {
+    read_callback_ = callback;
+    read_frame_chunks_ = frame_chunks;
+    if (done_) {
+      PostCallback();
+    }
+    return ERR_IO_PENDING;
+  }
+
+ private:
+  void PostCallback() {
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&EchoeyFakeWebSocketStream::DoCallback,
+                   base::Unretained(this)));
+  }
+
+  void DoCallback() {
+    if (done_) {
+      read_callback_.Run(ERR_CONNECTION_CLOSED);
+    } else if (!stored_frame_chunks_.empty()) {
+      done_ = MoveFrameChunks(read_frame_chunks_);
+      read_frame_chunks_ = NULL;
+      read_callback_.Run(OK);
+    }
+  }
+
+  // Copy the chunks stored in stored_frame_chunks_ to |to|, while unsetting the

[szym, 2013/07/12 17:44:51]

suggest "unsetting" -> "clearing"

[Adam Rice, 2013/07/12 20:46:55]

Done.

+  // "masked" header bit. Returns true if a Close Frame was seen, false
+  // otherwise.
+  bool MoveFrameChunks(ScopedVector<WebSocketFrameChunk>* to) {

[szym, 2013/07/12 17:44:51]

Suggest |out| rather than |to|.

[Adam Rice, 2013/07/12 20:46:55]

Done.

+    bool seen_close = false;
+    to->assign(stored_frame_chunks_.begin(), stored_frame_chunks_.end());

[szym, 2013/07/12 17:44:51]

out->swap(stored_frame_chunks_);
// alternatively
*out = stored_frame_chunks_.Pass();

[Adam Rice, 2013/07/12 20:46:55]

Oh yeah. I don't know why I did it the hard way.

+    for (ScopedVector<WebSocketFrameChunk>::iterator it = to->begin();
+         it != to->end();
+         ++it) {
+      if ((*it)->header) {
+        const scoped_ptr<WebSocketFrameHeader>& header = (*it)->header;

[szym, 2013/07/12 17:44:51]

Suggest simple pointer instead of const scoped_ptr&.

[Adam Rice, 2013/07/12 20:46:55]

Done.

+        if (header->masked) {

[szym, 2013/07/12 17:44:51]

unnecessary condition

[Adam Rice, 2013/07/12 20:46:55]

Done.

+          header->masked = false;
+        }
+        if (header->opcode == WebSocketFrameHeader::kOpCodeClose) {
+          seen_close = true;
+        }

[szym, 2013/07/12 17:44:51]

nit: unnecessary {}

[Adam Rice, 2013/07/12 20:46:55]

Done.

+      }
+    }
+    stored_frame_chunks_.weak_clear();
+    return seen_close;
+  }
+
+  ScopedVector<WebSocketFrameChunk> stored_frame_chunks_;
+  CompletionCallback read_callback_;
+  // Owned by the caller of ReadFrames().
+  ScopedVector<WebSocketFrameChunk>* read_frame_chunks_;
+  // True if we should close the connection.
+  bool done_;
+};
+
+// This mock is for verifying that WebSocket protocol semantics are obeyed (to
+// the extent that they are implemented in WebSocketCommon).
+class MockWebSocketStream : public WebSocketStream {
+ public:
+  MOCK_METHOD2(ReadFrames,
+               int(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                   const CompletionCallback& callback));
+  MOCK_METHOD2(WriteFrames,
+               int(ScopedVector<WebSocketFrameChunk>* frame_chunks,
+                   const CompletionCallback& callback));
+  MOCK_METHOD0(Close, void());
+  MOCK_CONST_METHOD0(GetSubProtocol, std::string());
+  MOCK_CONST_METHOD0(GetExtensions, std::string());
+  MOCK_METHOD0(AsWebSocketStream, WebSocketStream*());
+  MOCK_METHOD4(SendHandshakeRequest,
+               int(const GURL& url,
+                   const HttpRequestHeaders& headers,
+                   HttpResponseInfo* response_info,
+                   const CompletionCallback& callback));
+  MOCK_METHOD1(ReadHandshakeResponse, int(const CompletionCallback& callback));
+};
+
+struct ArgumentCopyingWebSocketFactory {
+  scoped_ptr<WebSocketStreamRequest> Factory(
+      const GURL& socket_url,
+      const std::vector<std::string>& requested_subprotocols,
+      const GURL& origin,
+      URLRequestContext* url_request_context,
+      const BoundNetLog& net_log,
+      scoped_ptr<WebSocketStream::ConnectDelegate> connect_delegate) {
+    this->socket_url = socket_url;
+    this->requested_subprotocols = requested_subprotocols;
+    this->origin = origin;
+    this->url_request_context = url_request_context;
+    this->net_log = net_log;
+    this->connect_delegate = connect_delegate.Pass();
+    return make_scoped_ptr(new WebSocketStreamRequest);
+  }
+
+  GURL socket_url;
+  GURL origin;
+  std::vector<std::string> requested_subprotocols;
+  URLRequestContext* url_request_context;
+  BoundNetLog net_log;
+  scoped_ptr<WebSocketStream::ConnectDelegate> connect_delegate;
+};
+
+// Converts a std::string to a std::vector<char>. For test purposes, it is
+// convenient to be able to specify data as a string, but the
+// WebSocketEventInterface requires the vector<char> type.
+std::vector<char> AsVector(const std::string& s) {
+  return std::vector<char>(s.begin(), s.end());
+}
+
+// Base class for WebSocketChannelTests.

[szym, 2013/07/12 17:44:51]

Suggest: // Base class for all test fixtures.

[Adam Rice, 2013/07/12 20:46:55]

Done.

+class WebSocketChannelTest : public ::testing::Test {
+ protected:
+  WebSocketChannelTest()
+      : data_(), channel_(), stream_(new FakeWebSocketStream) {}

[szym, 2013/07/12 17:44:51]

no need for default initializers

[Adam Rice, 2013/07/12 20:46:55]

Done.

+
+  // Creates a new WebSocketChannel and connects it, using the settings stored
+  // in |data_|.
+  void CreateChannelAndConnect() {
+    channel_.reset(new WebSocketChannel(data_.url, CreateEventInterface()));
+    channel_->SendAddChannelRequestForTesting(
+        data_.requested_subprotocols,
+        data_.origin,
+        &data_.url_request_context,
+        base::Bind(&ArgumentCopyingWebSocketFactory::Factory,
+                   base::Unretained(&data_.factory)));
+  }
+
+  // Same as CreateChannelAndConnect(), but calls the on_success callback as
+  // well. This method is virtual so that WebSocketChannelStreamTest can also

[szym, 2013/07/12 17:44:51]

To avoid "comment drift", just "subclasses" instead of
"WebSocketChannelStreamTest".
"Virtual to allow override." -- would probably suffice.

[Adam Rice, 2013/07/12 20:46:55]

"Virtual to allow override" is uncomfortably close to a tautology, so I settled
on your first comment.

+  // set the stream.
+  virtual void CreateChannelAndConnectSuccessfully() {
+    CreateChannelAndConnect();
+    data_.factory.connect_delegate->OnSuccess(stream_.Pass());
+  }
+
+  // Returns a WebSocketEventInterface to be passed to the WebSocketChannel.
+  // This implementation returns a newly-created fake. Subclasses may return a
+  // mock instead.
+  virtual scoped_ptr<WebSocketEventInterface> CreateEventInterface() {
+    return scoped_ptr<WebSocketEventInterface>(new FakeWebSocketEventInterface);
+  }
+
+  // This method serves no other purpose than to provide a nice syntax for
+  // assigning to stream_. class T must be a subclass of WebSocketStream or you
+  // will have unpleasant compile errors.
+  template <class T>
+  void set_stream(scoped_ptr<T> stream) {
+    // Since the definition of "PassAs" depends on the type T, the C++ standard
+    // requires the "template" keyword to indicate that "PassAs" should be
+    // parsed as a template method.

[szym, 2013/07/12 17:44:51]

remark: I learn something new about C++ every day.

+    stream_ = stream.template PassAs<WebSocketStream>();
+  }
+
+  // A struct containing the data that will be used to connect the channel.
+  struct ConnectData {
+    // URL to (pretend to) connect to.
+    GURL url;
+    // Origin of the request
+    GURL origin;
+    // Requested protocols for the request.
+    std::vector<std::string> requested_subprotocols;
+    // URLRequestContext object.
+    URLRequestContext url_request_context;
+    // A fake WebSocketFactory that just records its arguments.
+    ArgumentCopyingWebSocketFactory factory;
+  };
+  ConnectData data_;

[szym, 2013/07/12 17:44:51]

suggest connect_data_, but I don't really see the benefit of having it in a
separate struct. I'd just put all of the fields directly in the fixture, i.e.,
data_.url => url_
data_.factory => factory_

[Adam Rice, 2013/07/12 20:46:55]

Basically it's a struct so that I don't have to type as many underscores. I
realise that that is highly illogical.

+
+  // The channel we are testing. Not initialised until SetChannel() is called.
+  scoped_ptr<WebSocketChannel> channel_;
+
+  // A mock or fake stream for tests that need one.
+  scoped_ptr<WebSocketStream> stream_;
+};
+
+// Base class for tests which verify that EventInterface methods are called
+// appropriately.
+class WebSocketChannelEventInterfaceTest : public WebSocketChannelTest {
+ protected:
+  WebSocketChannelEventInterfaceTest()
+      : WebSocketChannelTest(),
+        event_interface_(new MockWebSocketEventInterface) {}
+
+  // Tests using this fixture must set expectations on the event_interface_ mock
+  // object before calling CreateChannelAndConnect() or
+  // CreateChannelAndConnectSuccessfully(). This will only work once per test
+  // case, but once should be enough.

[szym, 2013/07/12 17:44:51]

Just a remark: In test environment, it's typically OK to pass ownership of some
mock to an object under test, while retaining a plain pointer to it.

[Adam Rice, 2013/07/12 20:46:55]

The amount of time I want to spend debugging use-after-free bugs in unit tests
is extremely small. I'm willing to accept a reasonable degree of clumsiness to
avoid it.

+  virtual scoped_ptr<WebSocketEventInterface> CreateEventInterface() OVERRIDE {
+    return scoped_ptr<WebSocketEventInterface>(event_interface_.release());
+  }
+
+  scoped_ptr<MockWebSocketEventInterface> event_interface_;

[szym, 2013/07/12 17:44:51]

wondering if this should be a StrictMock.

[Adam Rice, 2013/07/12 20:46:55]

Yes, I had been wondering the same thing. I have made it so.

+};
+
+// Base class for tests which verify that WebSocketStream methods are called
+// appropriately by using a MockWebSocketStream.
+class WebSocketChannelStreamTest : public WebSocketChannelTest {
+ protected:
+  WebSocketChannelStreamTest()
+      : WebSocketChannelTest(), mock_stream_(new MockWebSocketStream) {}
+
+  virtual void CreateChannelAndConnectSuccessfully() OVERRIDE {
+    set_stream(mock_stream_.Pass());
+    WebSocketChannelTest::CreateChannelAndConnectSuccessfully();
+  }
+
+  scoped_ptr<MockWebSocketStream> mock_stream_;
+};
+
+// Simple test that everything that should be passed to the factory function is
+// passed to the factory function.
+TEST_F(WebSocketChannelTest, EverythingIsPassedToTheFactoryFunction) {
+  data_.url = GURL("ws://example.com/test");
+  data_.origin = GURL("http://example.com/test");
+  data_.requested_subprotocols.push_back("Sinbad");
+
+  CreateChannelAndConnect();
+
+  EXPECT_EQ(data_.url, data_.factory.socket_url);
+  EXPECT_EQ(data_.origin, data_.factory.origin);
+  EXPECT_EQ(data_.requested_subprotocols, data_.factory.requested_subprotocols);
+  EXPECT_EQ(&data_.url_request_context, data_.factory.url_request_context);
+}
+
+TEST_F(WebSocketChannelEventInterfaceTest, ConnectSuccessReported) {
+  // false means success.

[szym, 2013/07/12 17:44:51]

Would changing OnAddChannelResponse to (bool success, ...) make it easier to
read without comments?

[Adam Rice, 2013/07/12 20:46:55]

I've been bitten by this a few times, but I am trying to to stay close to the
draft mux spec. If I changed it, it would be to an enum. I am starting to view
function calls with mysterious boolean parameters in the same light as function
calls with unexplained magic constants.

[szym, 2013/07/12 21:03:22]

Agreed, also see Function(string, string, string, string) :-/

+  EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, ""));
+  // OnFlowControl is always called immediately after connect to provide initial
+  // quota to the renderer.
+  EXPECT_CALL(*event_interface_, OnFlowControl(_));
+
+  CreateChannelAndConnect();
+
+  data_.factory.connect_delegate->OnSuccess(stream_.Pass());
+}
+
+TEST_F(WebSocketChannelEventInterfaceTest, ConnectFailureReported) {
+  // true means failure.
+  EXPECT_CALL(*event_interface_, OnAddChannelResponse(true, ""));
+
+  CreateChannelAndConnect();
+
+  data_.factory.connect_delegate->OnFailure(kWebSocketErrorNoStatusReceived);
+}
+
+TEST_F(WebSocketChannelEventInterfaceTest, ProtocolPassed) {
+  EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, "Bob"));
+  EXPECT_CALL(*event_interface_, OnFlowControl(_));
+
+  CreateChannelAndConnect();
+
+  data_.factory.connect_delegate->OnSuccess(
+      scoped_ptr<WebSocketStream>(new FakeWebSocketStream("Bob", "")));
+}
+
+// The first frames from the server can arrive together with the handshake, in
+// which case they will be available as soon as ReadFrames() is called the first
+// time.
+TEST_F(WebSocketChannelEventInterfaceTest, DataLeftFromHandshake) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  static const InitFrameChunk chunks[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeText, NOT_MASKED, 5},
+     FINAL_CHUNK, "HELLO"},
+  };
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::SYNC, OK, chunks);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            true, WebSocketFrameHeader::kOpCodeText, AsVector("HELLO")));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+}
+
+// A remote server could accept the handshake, but then immediately send a
+// Close frame.
+TEST_F(WebSocketChannelEventInterfaceTest, CloseAfterHandshake) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  static const InitFrameChunk chunks[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeClose, NOT_MASKED, 23},
+     FINAL_CHUNK, "\x03\xf3Internal Server Error"},
+  };
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::SYNC, OK, chunks);
+  stream->PrepareReadFramesError(ReadableFakeWebSocketStream::SYNC,
+                                 ERR_CONNECTION_CLOSED);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(*event_interface_, OnClosingHandshake());
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketErrorInternalServerError,
+                              "Internal Server Error"));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+}
+
+// A remote server could close the connection immediately after sending the
+// handshake response (most likely a bug in the server).
+TEST_F(WebSocketChannelEventInterfaceTest, ConnectionCloseAfterHandshake) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  stream->PrepareReadFramesError(ReadableFakeWebSocketStream::SYNC,
+                                 ERR_CONNECTION_CLOSED);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDropChannel(kWebSocketErrorAbnormalClosure, "Abnormal Closure"));

[szym, 2013/07/12 17:44:51]

If the error message strings matter, should they be defined as constants
somewhere?

[Adam Rice, 2013/07/12 20:46:55]

No. Or rather, yes, if they did matter. But this one is an implementation
detail, and I shouldn't have been matching it in the first place.

+  }
+
+  CreateChannelAndConnectSuccessfully();
+}
+
+TEST_F(WebSocketChannelEventInterfaceTest, NormalAsyncRead) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  static const InitFrameChunk chunks[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeText, NOT_MASKED, 5},
+     FINAL_CHUNK, "HELLO"},
+  };
+  // We use this checkpoint object to verify that the callback isn't called
+  // until we expect it to be.
+  MockFunction<void(int)> checkpoint;
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(checkpoint, Call(1));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            true, WebSocketFrameHeader::kOpCodeText, AsVector("HELLO")));
+    EXPECT_CALL(checkpoint, Call(2));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  checkpoint.Call(1);
+  base::MessageLoop::current()->RunUntilIdle();
+  checkpoint.Call(2);
+}
+
+// Extra data can arrive while a read is being processed, resulting in the next
+// read completing synchronously.
+TEST_F(WebSocketChannelEventInterfaceTest, AsyncThenSyncRead) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  static const InitFrameChunk chunks1[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeText, NOT_MASKED, 5},
+     FINAL_CHUNK, "HELLO"},
+  };
+  static const InitFrameChunk chunks2[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeText, NOT_MASKED, 5},
+     FINAL_CHUNK, "WORLD"},
+  };
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks1);
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::SYNC, OK, chunks2);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            true, WebSocketFrameHeader::kOpCodeText, AsVector("HELLO")));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            true, WebSocketFrameHeader::kOpCodeText, AsVector("WORLD")));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// Data frames that arrive in fragments are turned into individual frames
+TEST_F(WebSocketChannelEventInterfaceTest, FragmentedFrames) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  // Here we have one message split into 3 frames which arrive in 3 chunks. The
+  // first frame is entirely in the first chunk, the second frame is split
+  // across all the chunks, and the final frame is entirely in the final
+  // chunk. The frame fragments are converted to separate frames so that they
+  // can be delivered immediatedly. So the EventInterface should see a Text
+  // message with 5 frames.
+  static const InitFrameChunk chunks1[] = {
+    {{NOT_FINAL_FRAME, WebSocketFrameHeader::kOpCodeText, NOT_MASKED, 5},
+     FINAL_CHUNK, "THREE"},
+    {{NOT_FINAL_FRAME, WebSocketFrameHeader::kOpCodeContinuation, NOT_MASKED,
+      7},
+     NOT_FINAL_CHUNK, " "},
+  };
+  static const InitFrameChunk chunks2[] = {{{NO_HEADER}, NOT_FINAL_CHUNK,
+                                            "SMALL"}};
+  static const InitFrameChunk chunks3[] = {
+    {{NO_HEADER}, FINAL_CHUNK, " "},
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeContinuation, NOT_MASKED, 6},
+     FINAL_CHUNK, "FRAMES"},
+  };
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks1);
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks2);
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks3);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            false, WebSocketFrameHeader::kOpCodeText, AsVector("THREE")));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            false, WebSocketFrameHeader::kOpCodeContinuation, AsVector(" ")));
+    EXPECT_CALL(*event_interface_,
+                OnDataFrame(false,
+                            WebSocketFrameHeader::kOpCodeContinuation,
+                            AsVector("SMALL")));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            false, WebSocketFrameHeader::kOpCodeContinuation, AsVector(" ")));
+    EXPECT_CALL(*event_interface_,
+                OnDataFrame(true,
+                            WebSocketFrameHeader::kOpCodeContinuation,
+                            AsVector("FRAMES")));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// In the case when a single-frame message because fragmented, it must be
+// correctly transformed to multiple frames.
+TEST_F(WebSocketChannelEventInterfaceTest, MessageFragmentation) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  // A single-frame Text message arrives in three chunks. This should be
+  // delivered as three frames.
+  static const InitFrameChunk chunks1[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeText, NOT_MASKED, 12},
+     NOT_FINAL_CHUNK, "TIME"},
+  };
+  static const InitFrameChunk chunks2[] = {{{NO_HEADER}, NOT_FINAL_CHUNK,
+                                            " FOR "}};
+  static const InitFrameChunk chunks3[] = {{{NO_HEADER}, FINAL_CHUNK, "TEA"}};
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks1);
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks2);
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks3);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            false, WebSocketFrameHeader::kOpCodeText, AsVector("TIME")));
+    EXPECT_CALL(*event_interface_,
+                OnDataFrame(false,
+                            WebSocketFrameHeader::kOpCodeContinuation,
+                            AsVector(" FOR ")));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            true, WebSocketFrameHeader::kOpCodeContinuation, AsVector("TEA")));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// If a control message is fragmented, it must be re-assembled before being
+// delivered. A control message can only be fragmented at the network level; it
+// is not permitted to be split into multiple frames.
+TEST_F(WebSocketChannelEventInterfaceTest, FragmentedControlMessage) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  static const InitFrameChunk chunks1[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeClose, NOT_MASKED, 7},
+     NOT_FINAL_CHUNK, "\x03\xe8"},
+  };
+  static const InitFrameChunk chunks2[] = {{{NO_HEADER}, NOT_FINAL_CHUNK,
+                                            "Clo"}};
+  static const InitFrameChunk chunks3[] = {{{NO_HEADER}, FINAL_CHUNK, "se"}};
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks1);
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks2);
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks3);
+  stream->PrepareReadFramesError(ReadableFakeWebSocketStream::ASYNC,
+                                 ERR_CONNECTION_CLOSED);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(*event_interface_, OnClosingHandshake());
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketNormalClosure, "Close"));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// Connection closed unexpectedly.
+TEST_F(WebSocketChannelEventInterfaceTest, AsyncAbnormalClosure) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  stream->PrepareReadFramesError(ReadableFakeWebSocketStream::ASYNC,
+                                 ERR_CONNECTION_CLOSED);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketErrorAbnormalClosure, _));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// Connection reset.

[szym, 2013/07/12 17:44:51]

Uninformative comment. I wonder if there is any technical difference between
this case and the one right above.

[Adam Rice, 2013/07/12 20:46:55]

The point is actually to verify that the behaviour is the same. As the
implementation currently stands, this is trivially true, but an older version of
WebSocketChannel actually treated the cases differently.

[szym, 2013/07/12 21:03:22]

ok

+TEST_F(WebSocketChannelEventInterfaceTest, ConnectionReset) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  stream->PrepareReadFramesError(ReadableFakeWebSocketStream::ASYNC,
+                                 ERR_CONNECTION_RESET);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketErrorAbnormalClosure, _));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// Connection closed in the middle of a Close message (server bug, etc.)
+TEST_F(WebSocketChannelEventInterfaceTest, ConnectionClosedInMessage) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  static const InitFrameChunk chunks[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeClose, NOT_MASKED, 7},
+     NOT_FINAL_CHUNK, "\x03\xe8"},
+  };
+
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks);
+  stream->PrepareReadFramesError(ReadableFakeWebSocketStream::ASYNC,
+                                 ERR_CONNECTION_CLOSED);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketErrorAbnormalClosure, _));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// RFC6455 5.1 "A client MUST close a connection if it detects a masked frame."
+TEST_F(WebSocketChannelEventInterfaceTest, MaskedFramesAreRejected) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  static const InitFrameChunk chunks[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeText, MASKED, 5}, FINAL_CHUNK,
+     "HELLO"}
+  };
+
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketErrorProtocolError, _));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// RFC6455 5.2 "If an unknown opcode is received, the receiving endpoint MUST
+// _Fail the WebSocket Connection_."
+TEST_F(WebSocketChannelEventInterfaceTest, UnknownOpCodeIsRejected) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  static const InitFrameChunk chunks[] = {{{FINAL_FRAME, 4, NOT_MASKED, 5},
+                                           FINAL_CHUNK, "HELLO"}};
+
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketErrorProtocolError, _));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// RFC6455 5.4 "Control frames ... MAY be injected in the middle of a
+// fragmented message."
+TEST_F(WebSocketChannelEventInterfaceTest, ControlFrameInDataMessage) {
+  scoped_ptr<ReadableFakeWebSocketStream> stream(
+      new ReadableFakeWebSocketStream);
+  // We have one message of type Text split into two frames. In the middle is a
+  // control message of type Pong.
+  static const InitFrameChunk chunks1[] = {
+    {{NOT_FINAL_FRAME, WebSocketFrameHeader::kOpCodeText, NOT_MASKED, 6},
+     FINAL_CHUNK, "SPLIT "},
+  };
+  static const InitFrameChunk chunks2[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodePong, NOT_MASKED, 0},
+     FINAL_CHUNK, ""}
+  };
+  static const InitFrameChunk chunks3[] = {
+    {{FINAL_FRAME, WebSocketFrameHeader::kOpCodeContinuation, NOT_MASKED, 7},
+     FINAL_CHUNK, "MESSAGE"}
+  };
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks1);
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks2);
+  stream->PrepareReadFrames(ReadableFakeWebSocketStream::ASYNC, OK, chunks3);
+  set_stream(stream.Pass());
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(
+        *event_interface_,
+        OnDataFrame(
+            false, WebSocketFrameHeader::kOpCodeText, AsVector("SPLIT ")));
+    EXPECT_CALL(*event_interface_,
+                OnDataFrame(true,
+                            WebSocketFrameHeader::kOpCodeContinuation,
+                            AsVector("MESSAGE")));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// If the renderer sends lots of small writes, we don't want to update the quota
+// for each one.
+TEST_F(WebSocketChannelEventInterfaceTest, SmallWriteDoesntUpdateQuota) {
+  set_stream(make_scoped_ptr(new WriteableFakeWebSocketStream));
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  channel_->SendFrame(true, WebSocketFrameHeader::kOpCodeText, AsVector("B"));
+}
+
+// If we send enough to go below send_quota_low_water_mask_ we should get our
+// quota refreshed.
+TEST_F(WebSocketChannelEventInterfaceTest, LargeWriteUpdatesQuota) {
+  set_stream(make_scoped_ptr(new WriteableFakeWebSocketStream));
+  // We use this checkpoint object to verify that the quota update comes after
+  // the write.
+  MockFunction<void(int)> checkpoint;
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(checkpoint, Call(1));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(checkpoint, Call(2));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  checkpoint.Call(1);
+  // TODO(ricea): If kDefaultSendQuotaHighWaterMark changes, then this value
+  // will need to be updated.
+  channel_->SendFrame(
+      true, WebSocketFrameHeader::kOpCodeText, std::vector<char>(1 << 17, 'B'));
+  checkpoint.Call(2);
+}
+
+// Verify that our quota actually is refreshed when we are told it is.
+TEST_F(WebSocketChannelEventInterfaceTest, QuotaReallyIsRefreshed) {
+  set_stream(make_scoped_ptr(new WriteableFakeWebSocketStream));
+  MockFunction<void(int)> checkpoint;
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(checkpoint, Call(1));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(checkpoint, Call(2));
+    // If quota was not really refreshed, we would get an OnDropChannel()
+    // message.
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(checkpoint, Call(3));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  checkpoint.Call(1);
+  // TODO(ricea): If kDefaultSendQuotaLowWaterMark and/or
+  // kDefaultSendQuotaHighWaterMark change, then this value will need to be
+  // updated.
+  channel_->SendFrame(true,
+                      WebSocketFrameHeader::kOpCodeText,
+                      std::vector<char>((1 << 16) + 1, 'D'));
+  checkpoint.Call(2);
+  // We should have received more quota at this point.
+  channel_->SendFrame(true,
+                      WebSocketFrameHeader::kOpCodeText,
+                      std::vector<char>((1 << 16) + 1, 'E'));
+  checkpoint.Call(3);
+}
+
+// If we send more than the available quota then the connection will be closed
+// with an error.
+TEST_F(WebSocketChannelEventInterfaceTest, WriteOverQuotaIsRejected) {
+  set_stream(make_scoped_ptr(new WriteableFakeWebSocketStream));
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    // TODO(ricea): Change this if kDefaultSendQuotaHighWaterMark changes.
+    EXPECT_CALL(*event_interface_, OnFlowControl(1 << 17));
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketMuxErrorSendQuotaViolation, _));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  channel_->SendFrame(true,
+                      WebSocketFrameHeader::kOpCodeText,
+                      std::vector<char>((1 << 17) + 1, 'C'));
+}
+
+// If a write fails, the channel is dropped.
+TEST_F(WebSocketChannelEventInterfaceTest, FailedWrite) {
+  set_stream(make_scoped_ptr(new UnWriteableFakeWebSocketStream));
+  MockFunction<void(int)> checkpoint;
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(checkpoint, Call(1));
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketErrorAbnormalClosure, _));
+    EXPECT_CALL(checkpoint, Call(2));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+  checkpoint.Call(1);
+
+  channel_->SendFrame(true, WebSocketFrameHeader::kOpCodeText, AsVector("H"));
+  checkpoint.Call(2);
+}
+
+// OnDropChannel() is called exactly once when StartClosingHandshake() is used.
+TEST_F(WebSocketChannelEventInterfaceTest, SendCloseDropsChannel) {
+  set_stream(make_scoped_ptr(new EchoeyFakeWebSocketStream));
+  {
+    InSequence s;
+    EXPECT_CALL(*event_interface_, OnAddChannelResponse(false, _));
+    EXPECT_CALL(*event_interface_, OnFlowControl(_));
+    EXPECT_CALL(*event_interface_,
+                OnDropChannel(kWebSocketNormalClosure, "Fred"));
+  }
+
+  CreateChannelAndConnectSuccessfully();
+
+  channel_->StartClosingHandshake(kWebSocketNormalClosure, "Fred");
+  base::MessageLoop::current()->RunUntilIdle();
+}
+
+// RFC6455 5.1 "a client MUST mask all frames that it sends to the server".
+// WebSocketChannel actually only sets the mask bit in the header, it doesn't
+// perform masking itself (not all transports actually use masking).
+TEST_F(WebSocketChannelStreamTest, SentFramesAreMasked) {
+  EXPECT_CALL(*mock_stream_, GetSubProtocol()).Times(AnyNumber());
+  EXPECT_CALL(*mock_stream_, ReadFrames(_, _)).WillOnce(Return(ERR_IO_PENDING));
+  EXPECT_CALL(
+      *mock_stream_,
+      WriteFrames(Pointee(ElementsAre(Pointee(Field(
+                      &WebSocketFrameChunk::header,
+                      Pointee(Field(&WebSocketFrameHeader::masked, true)))))),

[szym, 2013/07/12 17:44:51]

remark: feels like Lisp, http://xkcd.com/297/

I don't know googlemock well enough to propose a remedy :-/

[Adam Rice, 2013/07/12 20:46:55]

Yeah. And this is one of the simpler cases. In the "rest of the unit tests" CL I
added a custom matcher so this becomes WriteFrames(EqualsChunks(expected), _))
which I think is easier to read.

+                  _)).WillOnce(Return(ERR_IO_PENDING));
+
+  CreateChannelAndConnectSuccessfully();
+  channel_->SendFrame(
+      true, WebSocketFrameHeader::kOpCodeText, AsVector("NEEDS MASKING"));
+}
+
+}  // namespace
+}  // namespace net