Add AttachmentUploader interface and fake implementation.

sync/api/attachments/fake_attachment_uploader_unittest.cc

+// Copyright 2014 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 "sync/api/attachments/fake_attachment_uploader.h"
+
+#include "base/bind.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/ref_counted_memory.h"
+#include "base/message_loop/message_loop.h"
+#include "sync/api/attachments/attachment.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace syncer {
+
+namespace {
+
+const char kAttachmentData[] = "some data";
+
+}  // namespace
+
+class FakeAttachmentUploaderTest : public testing::Test {
+ protected:
+  virtual void SetUp() {
+    upload_callback_count = 0;
+    upload_callback = base::Bind(&FakeAttachmentUploaderTest::Increment,
+                                 base::Unretained(this),
+                                 &upload_callback_count);
+  }
+  base::MessageLoop message_loop;
+  FakeAttachmentUploader uploader;
+  int upload_callback_count;
+  AttachmentUploader::UploadCallback upload_callback;
+
+ private:
+  void Increment(int* success_count,
+                 const AttachmentUploader::UploadResult& result,
+                 const AttachmentId& ignored) {
+    if (result == AttachmentUploader::UPLOAD_SUCCESS) {
+      ++(*success_count);
+    }
+  }
+};
+
+// Call upload attachment several times, see that the supplied callback is
+// invoked the same number of times with a result of SUCCESS.
+TEST_F(FakeAttachmentUploaderTest, UploadAttachment) {
+  scoped_refptr<base::RefCountedString> some_data(new base::RefCountedString);
+  some_data->data() = kAttachmentData;
+  Attachment attachment1 = Attachment::Create(some_data);
+  Attachment attachment2 = Attachment::Create(some_data);
+  Attachment attachment3 = Attachment::Create(some_data);
+  uploader.UploadAttachment(attachment1, upload_callback);
+  uploader.UploadAttachment(attachment2, upload_callback);
+  uploader.UploadAttachment(attachment3, upload_callback);
+  message_loop.RunUntilIdle();
+  EXPECT_EQ(upload_callback_count, 3);
+}
+
+}  // namespace syncer