third_party/WebKit/Source/modules/indexeddb/IDBTransactionTest.cpp - chromium/src - Git at Google

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "modules/indexeddb/IDBTransaction.h"

 #include <memory>

 #include "bindings/core/v8/V8BindingForTesting.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/events/EventQueue.h"
 #include "modules/indexeddb/IDBDatabase.h"
 #include "modules/indexeddb/IDBDatabaseCallbacks.h"
 #include "modules/indexeddb/IDBValue.h"
 #include "modules/indexeddb/IDBValueWrapping.h"
 #include "modules/indexeddb/MockWebIDBDatabase.h"
 #include "platform/SharedBuffer.h"
 #include "platform/wtf/PtrUtil.h"
 #include "platform/wtf/RefPtr.h"
 #include "platform/wtf/Vector.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebURLLoaderMockFactory.h"
 #include "public/platform/WebURLResponse.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "v8/include/v8.h"

 namespace blink {
 namespace {

 void DeactivateNewTransactions(v8::Isolate* isolate) {
   V8PerIsolateData::From(isolate)->RunEndOfScopeTasks();
 }

 class FakeIDBDatabaseCallbacks final : public IDBDatabaseCallbacks {
  public:
   static FakeIDBDatabaseCallbacks* Create() {
     return new FakeIDBDatabaseCallbacks();
   }
   void OnVersionChange(int64_t old_version, int64_t new_version) override {}
   void OnForcedClose() override {}
   void OnAbort(int64_t transaction_id, DOMException* error) override {}
   void OnComplete(int64_t transaction_id) override {}

  private:
   FakeIDBDatabaseCallbacks() {}
 };

 class IDBTransactionTest : public ::testing::Test {
  protected:
   void SetUp() override {
     url_loader_mock_factory_ = Platform::Current()->GetURLLoaderMockFactory();
     WebURLResponse response;
     response.SetURL(KURL(KURL(), "blob:"));
     url_loader_mock_factory_->RegisterURLProtocol(WebString("blob"), response,
                                                   "");
   }

   void TearDown() override {
     url_loader_mock_factory_->UnregisterAllURLsAndClearMemoryCache();
   }

   void BuildTransaction(V8TestingScope& scope,
                         std::unique_ptr<MockWebIDBDatabase> backend) {
     db_ = IDBDatabase::Create(scope.GetExecutionContext(), std::move(backend),
                               FakeIDBDatabaseCallbacks::Create(),
                               scope.GetIsolate());

     HashSet<String> transaction_scope = {"store"};
     transaction_ = IDBTransaction::CreateNonVersionChange(
         scope.GetScriptState(), kTransactionId, transaction_scope,
         kWebIDBTransactionModeReadOnly, db_.Get());
   }

   WebURLLoaderMockFactory* url_loader_mock_factory_;
   Persistent<IDBDatabase> db_;
   Persistent<IDBTransaction> transaction_;

   static constexpr int64_t kTransactionId = 1234;
 };

 // The created value is an array of true. If create_wrapped_value is true, the
 // IDBValue's byte array will be wrapped in a Blob, otherwise it will not be.
 RefPtr<IDBValue> CreateIDBValue(v8::Isolate* isolate,
                                 bool create_wrapped_value) {
   size_t element_count = create_wrapped_value ? 16 : 2;
   v8::Local<v8::Array> v8_array = v8::Array::New(isolate, element_count);
   for (size_t i = 0; i < element_count; ++i)
     v8_array->Set(i, v8::True(isolate));

   NonThrowableExceptionState non_throwable_exception_state;
   IDBValueWrapper wrapper(isolate, v8_array,
                           SerializedScriptValue::SerializeOptions::kSerialize,
                           non_throwable_exception_state);
   wrapper.WrapIfBiggerThan(create_wrapped_value ? 0 : 1024 * element_count);

   std::unique_ptr<Vector<RefPtr<BlobDataHandle>>> blob_data_handles =
       WTF::MakeUnique<Vector<RefPtr<BlobDataHandle>>>();
   wrapper.ExtractBlobDataHandles(blob_data_handles.get());
   Vector<WebBlobInfo>& blob_infos = wrapper.WrappedBlobInfo();
   RefPtr<SharedBuffer> wrapped_marker_buffer = wrapper.ExtractWireBytes();

   RefPtr<IDBValue> idb_value =
       IDBValue::Create(wrapped_marker_buffer, std::move(blob_data_handles),
                        WTF::MakeUnique<Vector<WebBlobInfo>>(blob_infos));

   DCHECK_EQ(create_wrapped_value,
             IDBValueUnwrapper::IsWrapped(idb_value.Get()));
   return idb_value;
 }

 TEST_F(IDBTransactionTest, ContextDestroyedEarlyDeath) {
   V8TestingScope scope;
   std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
   EXPECT_CALL(*backend, Close()).Times(1);
   BuildTransaction(scope, std::move(backend));

   PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
   live_transactions.insert(transaction_);

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1u, live_transactions.size());

   Persistent<IDBRequest> request =
       IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
                          transaction_.Get(), IDBRequest::AsyncTraceState());

   DeactivateNewTransactions(scope.GetIsolate());

   request.Clear();  // The transaction is holding onto the request.
   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1u, live_transactions.size());

   // This will generate an Abort() call to the back end which is dropped by the
   // fake proxy, so an explicit OnAbort call is made.
   scope.GetExecutionContext()->NotifyContextDestroyed();
   transaction_->OnAbort(DOMException::Create(kAbortError, "Aborted"));
   transaction_.Clear();

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(0U, live_transactions.size());
 }

 TEST_F(IDBTransactionTest, ContextDestroyedAfterDone) {
   V8TestingScope scope;
   std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
   EXPECT_CALL(*backend, Close()).Times(1);
   BuildTransaction(scope, std::move(backend));

   PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
   live_transactions.insert(transaction_);

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1U, live_transactions.size());

   Persistent<IDBRequest> request =
       IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
                          transaction_.Get(), IDBRequest::AsyncTraceState());
   DeactivateNewTransactions(scope.GetIsolate());

   // This response should result in an event being enqueued immediately.
   request->HandleResponse(CreateIDBValue(scope.GetIsolate(), false));

   request.Clear();  // The transaction is holding onto the request.
   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1U, live_transactions.size());

   // This will generate an Abort() call to the back end which is dropped by the
   // fake proxy, so an explicit OnAbort call is made.
   scope.GetExecutionContext()->NotifyContextDestroyed();
   transaction_->OnAbort(DOMException::Create(kAbortError, "Aborted"));
   transaction_.Clear();

   // The request completed, so it has enqueued a success event. Discard the
   // event, so that the transaction can go away.
   EXPECT_EQ(1U, live_transactions.size());
   scope.GetExecutionContext()->GetEventQueue()->Close();

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(0U, live_transactions.size());
 }

 TEST_F(IDBTransactionTest, ContextDestroyedWithQueuedResult) {
   V8TestingScope scope;
   std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
   EXPECT_CALL(*backend, Close()).Times(1);
   BuildTransaction(scope, std::move(backend));

   PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
   live_transactions.insert(transaction_);

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1U, live_transactions.size());

   Persistent<IDBRequest> request =
       IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
                          transaction_.Get(), IDBRequest::AsyncTraceState());
   DeactivateNewTransactions(scope.GetIsolate());

   request->HandleResponse(CreateIDBValue(scope.GetIsolate(), true));

   request.Clear();  // The transaction is holding onto the request.
   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1U, live_transactions.size());

   // This will generate an Abort() call to the back end which is dropped by the
   // fake proxy, so an explicit OnAbort call is made.
   scope.GetExecutionContext()->NotifyContextDestroyed();
   transaction_->OnAbort(DOMException::Create(kAbortError, "Aborted"));
   transaction_.Clear();

   url_loader_mock_factory_->ServeAsynchronousRequests();

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(0U, live_transactions.size());
 }

 TEST_F(IDBTransactionTest, ContextDestroyedWithTwoQueuedResults) {
   V8TestingScope scope;
   std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
   EXPECT_CALL(*backend, Close()).Times(1);
   BuildTransaction(scope, std::move(backend));

   PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
   live_transactions.insert(transaction_);

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1U, live_transactions.size());

   Persistent<IDBRequest> request1 =
       IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
                          transaction_.Get(), IDBRequest::AsyncTraceState());
   Persistent<IDBRequest> request2 =
       IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
                          transaction_.Get(), IDBRequest::AsyncTraceState());
   DeactivateNewTransactions(scope.GetIsolate());

   request1->HandleResponse(CreateIDBValue(scope.GetIsolate(), true));
   request2->HandleResponse(CreateIDBValue(scope.GetIsolate(), true));

   request1.Clear();  // The transaction is holding onto the requests.
   request2.Clear();
   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1U, live_transactions.size());

   // This will generate an Abort() call to the back end which is dropped by the
   // fake proxy, so an explicit OnAbort call is made.
   scope.GetExecutionContext()->NotifyContextDestroyed();
   transaction_->OnAbort(DOMException::Create(kAbortError, "Aborted"));
   transaction_.Clear();

   url_loader_mock_factory_->ServeAsynchronousRequests();

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(0U, live_transactions.size());
 }

 TEST_F(IDBTransactionTest, TransactionFinish) {
   V8TestingScope scope;
   std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
   EXPECT_CALL(*backend, Commit(kTransactionId)).Times(1);
   EXPECT_CALL(*backend, Close()).Times(1);
   BuildTransaction(scope, std::move(backend));

   PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
   live_transactions.insert(transaction_);

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1U, live_transactions.size());

   DeactivateNewTransactions(scope.GetIsolate());

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1U, live_transactions.size());

   transaction_.Clear();

   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(1U, live_transactions.size());

   // Stop the context, so events don't get queued (which would keep the
   // transaction alive).
   scope.GetExecutionContext()->NotifyContextDestroyed();

   // Fire an abort to make sure this doesn't free the transaction during use.
   // The test will not fail if it is, but ASAN would notice the error.
   db_->OnAbort(kTransactionId, DOMException::Create(kAbortError, "Aborted"));

   // OnAbort() should have cleared the transaction's reference to the database.
   ThreadState::Current()->CollectAllGarbage();
   EXPECT_EQ(0U, live_transactions.size());
 }

 }  // namespace
 }  // namespace blink
	/*
	* Copyright (C) 2013 Google Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "modules/indexeddb/IDBTransaction.h"

	#include <memory>

	#include "bindings/core/v8/V8BindingForTesting.h"
	#include "core/dom/DOMException.h"
	#include "core/dom/Document.h"
	#include "core/dom/ExceptionCode.h"
	#include "core/events/EventQueue.h"
	#include "modules/indexeddb/IDBDatabase.h"
	#include "modules/indexeddb/IDBDatabaseCallbacks.h"
	#include "modules/indexeddb/IDBValue.h"
	#include "modules/indexeddb/IDBValueWrapping.h"
	#include "modules/indexeddb/MockWebIDBDatabase.h"
	#include "platform/SharedBuffer.h"
	#include "platform/wtf/PtrUtil.h"
	#include "platform/wtf/RefPtr.h"
	#include "platform/wtf/Vector.h"
	#include "public/platform/Platform.h"
	#include "public/platform/WebURLLoaderMockFactory.h"
	#include "public/platform/WebURLResponse.h"
	#include "testing/gtest/include/gtest/gtest.h"
	#include "v8/include/v8.h"

	namespace blink {
	namespace {

	void DeactivateNewTransactions(v8::Isolate* isolate) {
	V8PerIsolateData::From(isolate)->RunEndOfScopeTasks();
	}

	class FakeIDBDatabaseCallbacks final : public IDBDatabaseCallbacks {
	public:
	static FakeIDBDatabaseCallbacks* Create() {
	return new FakeIDBDatabaseCallbacks();
	}
	void OnVersionChange(int64_t old_version, int64_t new_version) override {}
	void OnForcedClose() override {}
	void OnAbort(int64_t transaction_id, DOMException* error) override {}
	void OnComplete(int64_t transaction_id) override {}

	private:
	FakeIDBDatabaseCallbacks() {}
	};

	class IDBTransactionTest : public ::testing::Test {
	protected:
	void SetUp() override {
	url_loader_mock_factory_ = Platform::Current()->GetURLLoaderMockFactory();
	WebURLResponse response;
	response.SetURL(KURL(KURL(), "blob:"));
	url_loader_mock_factory_->RegisterURLProtocol(WebString("blob"), response,
	"");
	}

	void TearDown() override {
	url_loader_mock_factory_->UnregisterAllURLsAndClearMemoryCache();
	}

	void BuildTransaction(V8TestingScope& scope,
	std::unique_ptr<MockWebIDBDatabase> backend) {
	db_ = IDBDatabase::Create(scope.GetExecutionContext(), std::move(backend),
	FakeIDBDatabaseCallbacks::Create(),
	scope.GetIsolate());

	HashSet<String> transaction_scope = {"store"};
	transaction_ = IDBTransaction::CreateNonVersionChange(
	scope.GetScriptState(), kTransactionId, transaction_scope,
	kWebIDBTransactionModeReadOnly, db_.Get());
	}

	WebURLLoaderMockFactory* url_loader_mock_factory_;
	Persistent<IDBDatabase> db_;
	Persistent<IDBTransaction> transaction_;

	static constexpr int64_t kTransactionId = 1234;
	};

	// The created value is an array of true. If create_wrapped_value is true, the
	// IDBValue's byte array will be wrapped in a Blob, otherwise it will not be.
	RefPtr<IDBValue> CreateIDBValue(v8::Isolate* isolate,
	bool create_wrapped_value) {
	size_t element_count = create_wrapped_value ? 16 : 2;
	v8::Local<v8::Array> v8_array = v8::Array::New(isolate, element_count);
	for (size_t i = 0; i < element_count; ++i)
	v8_array->Set(i, v8::True(isolate));

	NonThrowableExceptionState non_throwable_exception_state;
	IDBValueWrapper wrapper(isolate, v8_array,
	SerializedScriptValue::SerializeOptions::kSerialize,
	non_throwable_exception_state);
	wrapper.WrapIfBiggerThan(create_wrapped_value ? 0 : 1024 * element_count);

	std::unique_ptr<Vector<RefPtr<BlobDataHandle>>> blob_data_handles =
	WTF::MakeUnique<Vector<RefPtr<BlobDataHandle>>>();
	wrapper.ExtractBlobDataHandles(blob_data_handles.get());
	Vector<WebBlobInfo>& blob_infos = wrapper.WrappedBlobInfo();
	RefPtr<SharedBuffer> wrapped_marker_buffer = wrapper.ExtractWireBytes();

	RefPtr<IDBValue> idb_value =
	IDBValue::Create(wrapped_marker_buffer, std::move(blob_data_handles),
	WTF::MakeUnique<Vector<WebBlobInfo>>(blob_infos));

	DCHECK_EQ(create_wrapped_value,
	IDBValueUnwrapper::IsWrapped(idb_value.Get()));
	return idb_value;
	}

	TEST_F(IDBTransactionTest, ContextDestroyedEarlyDeath) {
	V8TestingScope scope;
	std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
	EXPECT_CALL(*backend, Close()).Times(1);
	BuildTransaction(scope, std::move(backend));

	PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
	live_transactions.insert(transaction_);

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1u, live_transactions.size());

	Persistent<IDBRequest> request =
	IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
	transaction_.Get(), IDBRequest::AsyncTraceState());

	DeactivateNewTransactions(scope.GetIsolate());

	request.Clear(); // The transaction is holding onto the request.
	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1u, live_transactions.size());

	// This will generate an Abort() call to the back end which is dropped by the
	// fake proxy, so an explicit OnAbort call is made.
	scope.GetExecutionContext()->NotifyContextDestroyed();
	transaction_->OnAbort(DOMException::Create(kAbortError, "Aborted"));
	transaction_.Clear();

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(0U, live_transactions.size());
	}

	TEST_F(IDBTransactionTest, ContextDestroyedAfterDone) {
	V8TestingScope scope;
	std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
	EXPECT_CALL(*backend, Close()).Times(1);
	BuildTransaction(scope, std::move(backend));

	PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
	live_transactions.insert(transaction_);

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1U, live_transactions.size());

	Persistent<IDBRequest> request =
	IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
	transaction_.Get(), IDBRequest::AsyncTraceState());
	DeactivateNewTransactions(scope.GetIsolate());

	// This response should result in an event being enqueued immediately.
	request->HandleResponse(CreateIDBValue(scope.GetIsolate(), false));

	request.Clear(); // The transaction is holding onto the request.
	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1U, live_transactions.size());

	// This will generate an Abort() call to the back end which is dropped by the
	// fake proxy, so an explicit OnAbort call is made.
	scope.GetExecutionContext()->NotifyContextDestroyed();
	transaction_->OnAbort(DOMException::Create(kAbortError, "Aborted"));
	transaction_.Clear();

	// The request completed, so it has enqueued a success event. Discard the
	// event, so that the transaction can go away.
	EXPECT_EQ(1U, live_transactions.size());
	scope.GetExecutionContext()->GetEventQueue()->Close();

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(0U, live_transactions.size());
	}

	TEST_F(IDBTransactionTest, ContextDestroyedWithQueuedResult) {
	V8TestingScope scope;
	std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
	EXPECT_CALL(*backend, Close()).Times(1);
	BuildTransaction(scope, std::move(backend));

	PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
	live_transactions.insert(transaction_);

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1U, live_transactions.size());

	Persistent<IDBRequest> request =
	IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
	transaction_.Get(), IDBRequest::AsyncTraceState());
	DeactivateNewTransactions(scope.GetIsolate());

	request->HandleResponse(CreateIDBValue(scope.GetIsolate(), true));

	request.Clear(); // The transaction is holding onto the request.
	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1U, live_transactions.size());

	// This will generate an Abort() call to the back end which is dropped by the
	// fake proxy, so an explicit OnAbort call is made.
	scope.GetExecutionContext()->NotifyContextDestroyed();
	transaction_->OnAbort(DOMException::Create(kAbortError, "Aborted"));
	transaction_.Clear();

	url_loader_mock_factory_->ServeAsynchronousRequests();

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(0U, live_transactions.size());
	}

	TEST_F(IDBTransactionTest, ContextDestroyedWithTwoQueuedResults) {
	V8TestingScope scope;
	std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
	EXPECT_CALL(*backend, Close()).Times(1);
	BuildTransaction(scope, std::move(backend));

	PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
	live_transactions.insert(transaction_);

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1U, live_transactions.size());

	Persistent<IDBRequest> request1 =
	IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
	transaction_.Get(), IDBRequest::AsyncTraceState());
	Persistent<IDBRequest> request2 =
	IDBRequest::Create(scope.GetScriptState(), IDBAny::CreateUndefined(),
	transaction_.Get(), IDBRequest::AsyncTraceState());
	DeactivateNewTransactions(scope.GetIsolate());

	request1->HandleResponse(CreateIDBValue(scope.GetIsolate(), true));
	request2->HandleResponse(CreateIDBValue(scope.GetIsolate(), true));

	request1.Clear(); // The transaction is holding onto the requests.
	request2.Clear();
	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1U, live_transactions.size());

	// This will generate an Abort() call to the back end which is dropped by the
	// fake proxy, so an explicit OnAbort call is made.
	scope.GetExecutionContext()->NotifyContextDestroyed();
	transaction_->OnAbort(DOMException::Create(kAbortError, "Aborted"));
	transaction_.Clear();

	url_loader_mock_factory_->ServeAsynchronousRequests();

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(0U, live_transactions.size());
	}

	TEST_F(IDBTransactionTest, TransactionFinish) {
	V8TestingScope scope;
	std::unique_ptr<MockWebIDBDatabase> backend = MockWebIDBDatabase::Create();
	EXPECT_CALL(*backend, Commit(kTransactionId)).Times(1);
	EXPECT_CALL(*backend, Close()).Times(1);
	BuildTransaction(scope, std::move(backend));

	PersistentHeapHashSet<WeakMember<IDBTransaction>> live_transactions;
	live_transactions.insert(transaction_);

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1U, live_transactions.size());

	DeactivateNewTransactions(scope.GetIsolate());

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1U, live_transactions.size());

	transaction_.Clear();

	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(1U, live_transactions.size());

	// Stop the context, so events don't get queued (which would keep the
	// transaction alive).
	scope.GetExecutionContext()->NotifyContextDestroyed();

	// Fire an abort to make sure this doesn't free the transaction during use.
	// The test will not fail if it is, but ASAN would notice the error.
	db_->OnAbort(kTransactionId, DOMException::Create(kAbortError, "Aborted"));

	// OnAbort() should have cleared the transaction's reference to the database.
	ThreadState::Current()->CollectAllGarbage();
	EXPECT_EQ(0U, live_transactions.size());
	}

	} // namespace
	} // namespace blink