Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

2 files changed, 968 insertions, 0 deletions

diff --git a/uriloader/preload/gtest/TestFetchPreloader.cpp b/uriloader/preload/gtest/TestFetchPreloader.cpp
new file mode 100644
index 0000000000..03eed3d15b
--- /dev/null
+++ b/uriloader/preload/gtest/TestFetchPreloader.cpp
@@ -0,0 +1,950 @@
+#include "gtest/gtest.h"
+
+#include "mozilla/CORSMode.h"
+#include "mozilla/dom/XMLDocument.h"
+#include "mozilla/dom/ReferrerPolicyBinding.h"
+#include "mozilla/FetchPreloader.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/PreloadHashKey.h"
+#include "mozilla/SpinEventLoopUntil.h"
+#include "nsNetUtil.h"
+#include "nsIChannel.h"
+#include "nsIStreamListener.h"
+#include "nsThreadUtils.h"
+#include "nsStringStream.h"
+
+namespace {
+
+auto const ERROR_CANCEL = NS_ERROR_ABORT;
+auto const ERROR_ONSTOP = NS_ERROR_NET_INTERRUPT;
+auto const ERROR_THROW = NS_ERROR_FAILURE;
+
+class FakeChannel : public nsIChannel {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSICHANNEL
+  NS_DECL_NSIREQUEST
+
+  nsresult Start() { return mListener->OnStartRequest(this); }
+  nsresult Data(const nsACString& aData) {
+    if (NS_FAILED(mStatus)) {
+      return mStatus;
+    }
+    nsCOMPtr<nsIInputStream> is;
+    NS_NewCStringInputStream(getter_AddRefs(is), aData);
+    return mListener->OnDataAvailable(this, is, 0, aData.Length());
+  }
+  nsresult Stop(nsresult status) {
+    if (NS_SUCCEEDED(mStatus)) {
+      mStatus = status;
+    }
+    mListener->OnStopRequest(this, mStatus);
+    mListener = nullptr;
+    return mStatus;
+  }
+
+ private:
+  virtual ~FakeChannel() = default;
+  bool mIsPending = false;
+  bool mCanceled = false;
+  nsresult mStatus = NS_OK;
+  nsCOMPtr<nsIStreamListener> mListener;
+};
+
+NS_IMPL_ISUPPORTS(FakeChannel, nsIChannel, nsIRequest)
+
+NS_IMETHODIMP FakeChannel::GetName(nsACString& result) { return NS_OK; }
+NS_IMETHODIMP FakeChannel::IsPending(bool* result) {
+  *result = mIsPending;
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetStatus(nsresult* status) {
+  *status = mStatus;
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::SetCanceledReason(const nsACString& aReason) {
+  return SetCanceledReasonImpl(aReason);
+}
+NS_IMETHODIMP FakeChannel::GetCanceledReason(nsACString& aReason) {
+  return GetCanceledReasonImpl(aReason);
+}
+NS_IMETHODIMP FakeChannel::CancelWithReason(nsresult aStatus,
+                                            const nsACString& aReason) {
+  return CancelWithReasonImpl(aStatus, aReason);
+}
+NS_IMETHODIMP FakeChannel::Cancel(nsresult status) {
+  if (!mCanceled) {
+    mCanceled = true;
+    mStatus = status;
+  }
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::Suspend() { return NS_OK; }
+NS_IMETHODIMP FakeChannel::Resume() { return NS_OK; }
+NS_IMETHODIMP FakeChannel::GetLoadFlags(nsLoadFlags* aLoadFlags) {
+  *aLoadFlags = 0;
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::SetLoadFlags(nsLoadFlags aLoadFlags) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetTRRMode(nsIRequest::TRRMode* aTRRMode) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+NS_IMETHODIMP FakeChannel::SetTRRMode(nsIRequest::TRRMode aTRRMode) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+NS_IMETHODIMP FakeChannel::GetLoadGroup(nsILoadGroup** aLoadGroup) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::SetLoadGroup(nsILoadGroup* aLoadGroup) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetOriginalURI(nsIURI** aURI) { return NS_OK; }
+NS_IMETHODIMP FakeChannel::SetOriginalURI(nsIURI* aURI) { return NS_OK; }
+NS_IMETHODIMP FakeChannel::GetURI(nsIURI** aURI) { return NS_OK; }
+NS_IMETHODIMP FakeChannel::GetOwner(nsISupports** aOwner) { return NS_OK; }
+NS_IMETHODIMP FakeChannel::SetOwner(nsISupports* aOwner) { return NS_OK; }
+NS_IMETHODIMP FakeChannel::SetLoadInfo(nsILoadInfo* aLoadInfo) { return NS_OK; }
+NS_IMETHODIMP FakeChannel::GetLoadInfo(nsILoadInfo** aLoadInfo) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetIsDocument(bool* aIsDocument) {
+  *aIsDocument = false;
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetNotificationCallbacks(
+    nsIInterfaceRequestor** aCallbacks) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::SetNotificationCallbacks(
+    nsIInterfaceRequestor* aCallbacks) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetSecurityInfo(
+    nsITransportSecurityInfo** aSecurityInfo) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetContentType(nsACString& aContentType) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::SetContentType(const nsACString& aContentType) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetContentCharset(nsACString& aContentCharset) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::SetContentCharset(
+    const nsACString& aContentCharset) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetContentDisposition(
+    uint32_t* aContentDisposition) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::SetContentDisposition(uint32_t aContentDisposition) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetContentDispositionFilename(
+    nsAString& aContentDispositionFilename) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::SetContentDispositionFilename(
+    const nsAString& aContentDispositionFilename) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetContentDispositionHeader(
+    nsACString& aContentDispositionHeader) {
+  return NS_ERROR_NOT_AVAILABLE;
+}
+NS_IMETHODIMP FakeChannel::GetContentLength(int64_t* aContentLength) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::SetContentLength(int64_t aContentLength) {
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::GetCanceled(bool* aCanceled) {
+  *aCanceled = mCanceled;
+  return NS_OK;
+}
+NS_IMETHODIMP FakeChannel::Open(nsIInputStream** aStream) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+NS_IMETHODIMP
+FakeChannel::AsyncOpen(nsIStreamListener* aListener) {
+  mIsPending = true;
+  mListener = aListener;
+  return NS_OK;
+}
+
+class FakePreloader : public mozilla::FetchPreloader {
+ public:
+  explicit FakePreloader(FakeChannel* aChannel) : mDrivingChannel(aChannel) {}
+
+ private:
+  RefPtr<FakeChannel> mDrivingChannel;
+
+  virtual nsresult CreateChannel(
+      nsIChannel** aChannel, nsIURI* aURI, const mozilla::CORSMode aCORSMode,
+      const mozilla::dom::ReferrerPolicy& aReferrerPolicy,
+      mozilla::dom::Document* aDocument, nsILoadGroup* aLoadGroup,
+      nsIInterfaceRequestor* aCallbacks, uint64_t aHttpChannelId) override {
+    mDrivingChannel.forget(aChannel);
+    return NS_OK;
+  }
+};
+
+class FakeListener : public nsIStreamListener {
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIREQUESTOBSERVER
+  NS_DECL_NSISTREAMLISTENER
+
+  enum { Never, OnStart, OnData, OnStop } mCancelIn = Never;
+
+  nsresult mOnStartResult = NS_OK;
+  nsresult mOnDataResult = NS_OK;
+  nsresult mOnStopResult = NS_OK;
+
+  bool mOnStart = false;
+  nsCString mOnData;
+  Maybe<nsresult> mOnStop;
+
+ private:
+  virtual ~FakeListener() = default;
+};
+
+NS_IMPL_ISUPPORTS(FakeListener, nsIStreamListener, nsIRequestObserver)
+
+NS_IMETHODIMP FakeListener::OnStartRequest(nsIRequest* request) {
+  EXPECT_FALSE(mOnStart);
+  mOnStart = true;
+
+  if (mCancelIn == OnStart) {
+    request->Cancel(ERROR_CANCEL);
+  }
+
+  return mOnStartResult;
+}
+NS_IMETHODIMP FakeListener::OnDataAvailable(nsIRequest* request,
+                                            nsIInputStream* input,
+                                            uint64_t offset, uint32_t count) {
+  nsAutoCString data;
+  data.SetLength(count);
+
+  uint32_t read;
+  input->Read(data.BeginWriting(), count, &read);
+  mOnData += data;
+
+  if (mCancelIn == OnData) {
+    request->Cancel(ERROR_CANCEL);
+  }
+
+  return mOnDataResult;
+}
+NS_IMETHODIMP FakeListener::OnStopRequest(nsIRequest* request,
+                                          nsresult status) {
+  EXPECT_FALSE(mOnStop);
+  mOnStop.emplace(status);
+
+  if (mCancelIn == OnStop) {
+    request->Cancel(ERROR_CANCEL);
+  }
+
+  return mOnStopResult;
+}
+
+bool eventInProgress = true;
+
+void Await() {
+  MOZ_ALWAYS_TRUE(mozilla::SpinEventLoopUntil(
+      "uriloader:TestFetchPreloader:Await"_ns, [&]() {
+        bool yield = !eventInProgress;
+        eventInProgress = true;  // Just for convenience
+        return yield;
+      }));
+}
+
+void Yield() { eventInProgress = false; }
+
+}  // namespace
+
+// ****************************************************************************
+// Test body
+// ****************************************************************************
+
+// Caching with all good results (data + NS_OK)
+TEST(TestFetchPreloader, CacheNoneBeforeConsume)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("onetwothree"));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == NS_OK);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CacheStartBeforeConsume)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+
+    EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+    EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+    EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("onetwothree"));
+
+    EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == NS_OK);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CachePartOfDataBeforeConsume)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+
+    EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("onetwothree"));
+
+    EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == NS_OK);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CacheAllDataBeforeConsume)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+
+  // Request consumation of the preload...
+  RefPtr<FakeListener> listener = new FakeListener();
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("onetwothree"));
+
+    EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == NS_OK);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CacheAllBeforeConsume)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("onetwothree"));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == NS_OK);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+// Get data before the channel fails
+TEST(TestFetchPreloader, CacheAllBeforeConsumeWithChannelError)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+  EXPECT_NS_FAILED(channel->Stop(ERROR_ONSTOP));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("onetwothree"));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_ONSTOP);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+// Cancel the channel between caching and consuming
+TEST(TestFetchPreloader, CacheAllBeforeConsumeWithChannelCancel)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  channel->Cancel(ERROR_CANCEL);
+  EXPECT_NS_FAILED(channel->Stop(ERROR_CANCEL));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    // XXX - This is hard to solve; the data is there but we won't deliver it.
+    // This is a bit different case than e.g. a network error.  We want to
+    // deliver some data in that case.  Cancellation probably happens because of
+    // navigation or a demand to not consume the channel anyway.
+    EXPECT_TRUE(listener->mOnData.IsEmpty());
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_CANCEL);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+// Let the listener throw while data is already cached
+TEST(TestFetchPreloader, CacheAllBeforeConsumeThrowFromOnStartRequest)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  listener->mOnStartResult = ERROR_THROW;
+
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.IsEmpty());
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_THROW);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CacheAllBeforeConsumeThrowFromOnDataAvailable)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  listener->mOnDataResult = ERROR_THROW;
+
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("one"));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_THROW);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CacheAllBeforeConsumeThrowFromOnStopRequest)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  listener->mOnStopResult = ERROR_THROW;
+
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("onetwothree"));
+    // Throwing from OnStopRequest is generally ignored.
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == NS_OK);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+// Cancel the channel in various callbacks
+TEST(TestFetchPreloader, CacheAllBeforeConsumeCancelInOnStartRequest)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  listener->mCancelIn = FakeListener::OnStart;
+  // check that throwing from OnStartRequest doesn't affect the cancellation
+  // status.
+  listener->mOnStartResult = ERROR_THROW;
+
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.IsEmpty());
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_CANCEL);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CacheAllBeforeConsumeCancelInOnDataAvailable)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  listener->mCancelIn = FakeListener::OnData;
+  // check that throwing from OnStartRequest doesn't affect the cancellation
+  // status.
+  listener->mOnDataResult = ERROR_THROW;
+
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("one"));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_CANCEL);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+// Corner cases
+TEST(TestFetchPreloader, CachePartlyBeforeConsumeCancelInOnDataAvailable)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  listener->mCancelIn = FakeListener::OnData;
+
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_NS_FAILED(channel->Data("three"_ns));
+    EXPECT_NS_FAILED(channel->Stop(NS_OK));
+
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("one"));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_CANCEL);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CachePartlyBeforeConsumeCancelInOnStartRequestAndRace)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+
+  // This has to simulate a possibiilty when stream listener notifications from
+  // the channel are already pending in the queue while AsyncConsume is called.
+  // At this moment the listener has not been notified yet.
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+    EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+  }));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  listener->mCancelIn = FakeListener::OnStart;
+
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  // Check listener's been fed properly.  Expected is to NOT get any data and
+  // propagate the cancellation code and not being called duplicated
+  // OnStopRequest.
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.IsEmpty());
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_CANCEL);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CachePartlyBeforeConsumeCancelInOnDataAvailableAndRace)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+
+  // This has to simulate a possibiilty when stream listener notifications from
+  // the channel are already pending in the queue while AsyncConsume is called.
+  // At this moment the listener has not been notified yet.
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+    EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+  }));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  listener->mCancelIn = FakeListener::OnData;
+
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  // Check listener's been fed properly.  Expected is to NOT get anything after
+  // the first OnData and propagate the cancellation code and not being called
+  // duplicated OnStopRequest.
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.EqualsLiteral("one"));
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_CANCEL);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
+
+TEST(TestFetchPreloader, CachePartlyBeforeConsumeThrowFromOnStartRequestAndRace)
+{
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "https://example.com"_ns);
+  auto key = mozilla::PreloadHashKey::CreateAsFetch(uri, mozilla::CORS_NONE);
+
+  RefPtr<FakeChannel> channel = new FakeChannel();
+  RefPtr<FakePreloader> preloader = new FakePreloader(channel);
+  RefPtr<mozilla::dom::Document> doc;
+  NS_NewXMLDocument(getter_AddRefs(doc));
+
+  EXPECT_TRUE(NS_SUCCEEDED(
+      preloader->OpenChannel(key, uri, mozilla::CORS_NONE,
+                             mozilla::dom::ReferrerPolicy::_empty, doc, 0)));
+
+  EXPECT_NS_SUCCEEDED(channel->Start());
+  EXPECT_NS_SUCCEEDED(channel->Data("one"_ns));
+  EXPECT_NS_SUCCEEDED(channel->Data("two"_ns));
+
+  // This has to simulate a possibiilty when stream listener notifications from
+  // the channel are already pending in the queue while AsyncConsume is called.
+  // At this moment the listener has not been notified yet.
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_NS_SUCCEEDED(channel->Data("three"_ns));
+    EXPECT_NS_SUCCEEDED(channel->Stop(NS_OK));
+  }));
+
+  RefPtr<FakeListener> listener = new FakeListener();
+  listener->mOnStartResult = ERROR_THROW;
+
+  EXPECT_NS_SUCCEEDED(preloader->AsyncConsume(listener));
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+
+  // Check listener's been fed properly.  Expected is to NOT get any data and
+  // propagate the throwing code and not being called duplicated OnStopRequest.
+  NS_DispatchToMainThread(NS_NewRunnableFunction("test", [&]() {
+    EXPECT_TRUE(listener->mOnStart);
+    EXPECT_TRUE(listener->mOnData.IsEmpty());
+    EXPECT_TRUE(listener->mOnStop && *listener->mOnStop == ERROR_THROW);
+
+    Yield();
+  }));
+
+  Await();
+
+  EXPECT_FALSE(NS_SUCCEEDED(preloader->AsyncConsume(listener)));
+}
diff --git a/uriloader/preload/gtest/moz.build b/uriloader/preload/gtest/moz.build
new file mode 100644
index 0000000000..72c2afa539
--- /dev/null
+++ b/uriloader/preload/gtest/moz.build
@@ -0,0 +1,18 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+UNIFIED_SOURCES += [
+    "TestFetchPreloader.cpp",
+]
+
+LOCAL_INCLUDES += [
+    "/netwerk/base",
+    "/xpcom/tests/gtest",
+]
+
+FINAL_LIBRARY = "xul-gtest"
+
+LOCAL_INCLUDES += ["!/xpcom", "/xpcom/components"]