Include tab IDs when reporting data use accounting.

chrome/browser/data_usage/tab_id_provider_unittest.cc

+// Copyright 2015 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 "chrome/browser/data_usage/tab_id_provider.h"
+
+#include <stdint.h>
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/location.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
+#include "base/task_runner.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chrome_browser_data_usage {
+
+namespace {
+
+const int32_t kTabId = 10;
+
+class TabIdProviderTest : public testing::Test {
+ public:
+  TabIdProviderTest()
+      : task_runner_(base::MessageLoop::current()->task_runner()),
+        tab_id_getter_call_count_(0) {}
+
+  ~TabIdProviderTest() override {}
+
+  base::Callback<int32_t(void)> TabIdGetterCallback() {
+    return base::Bind(&TabIdProviderTest::GetTabId, base::Unretained(this));
+  }
+
+  base::TaskRunner* task_runner() { return task_runner_.get(); }
+  base::RunLoop* run_loop() { return &run_loop_; }
+  int tab_id_getter_call_count() const { return tab_id_getter_call_count_; }
+
+ private:
+  int32_t GetTabId() {
+    ++tab_id_getter_call_count_;
+    return kTabId;
+  }
+
+  base::MessageLoop message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  base::RunLoop run_loop_;
+  int tab_id_getter_call_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabIdProviderTest);
+};
+
+// Copies |tab_id| into |capture|.
+void CaptureTabId(int32_t* capture, int32_t tab_id) {
+  *capture = tab_id;
+}
+
+TEST_F(TabIdProviderTest, ProvideTabId) {
+  TabIdProvider provider(task_runner(), FROM_HERE, TabIdGetterCallback());
+
+  int32_t tab_id = -1;
+  provider.ProvideTabId(base::Bind(&CaptureTabId, &tab_id));
+  run_loop()->RunUntilIdle();
+
+  EXPECT_EQ(1, tab_id_getter_call_count());
+  EXPECT_EQ(kTabId, tab_id);
+}
+
+TEST_F(TabIdProviderTest, ProvideTabIdPiggyback) {
+  TabIdProvider provider(task_runner(), FROM_HERE, TabIdGetterCallback());
+
+  // First, ask for the first tab ID to kick things off.
+  int32_t first_tab_id = -1;
+  provider.ProvideTabId(base::Bind(&CaptureTabId, &first_tab_id));
+
+  // The first tab ID callback should still be pending, with the tab ID not
+  // available yet, so this second callback should piggyback off of the first
+  // callback.
+  int32_t piggyback_tab_id = -1;
+  provider.ProvideTabId(base::Bind(&CaptureTabId, &piggyback_tab_id));
+
+  run_loop()->RunUntilIdle();
+
+  // The tab ID getter callback should only have been called once.
+  EXPECT_EQ(1, tab_id_getter_call_count());
+  EXPECT_EQ(kTabId, first_tab_id);
+  EXPECT_EQ(kTabId, piggyback_tab_id);
+}
+
+TEST_F(TabIdProviderTest, ProvideTabIdCacheHit) {
+  TabIdProvider provider(task_runner(), FROM_HERE, TabIdGetterCallback());
+
+  // First, ask for the first tab ID to kick things off.
+  int32_t first_tab_id = -1;
+  provider.ProvideTabId(base::Bind(&CaptureTabId, &first_tab_id));
+
+  // Wait for the first tab ID callback to finish.
+  run_loop()->RunUntilIdle();
+
+  EXPECT_EQ(1, tab_id_getter_call_count());
+  EXPECT_EQ(kTabId, first_tab_id);
+
+  // Ask for another tab ID, which should be satisfied by the cached tab ID from
+  // the first callback.
+  int32_t cache_hit_tab_id = -1;
+  provider.ProvideTabId(base::Bind(&CaptureTabId, &cache_hit_tab_id));
+
+  // This cache hit callback should run synchronously, without causing the tab
+  // ID getter callback to run again.
+  EXPECT_EQ(1, tab_id_getter_call_count());
+  EXPECT_EQ(kTabId, cache_hit_tab_id);
+}
+
+TEST_F(TabIdProviderTest, ProvideTabIdAfterProviderDestroyed) {
+  scoped_ptr<TabIdProvider> provider(
+      new TabIdProvider(task_runner(), FROM_HERE, TabIdGetterCallback()));
+
+  // Ask for two tab IDs.
+  int32_t first_tab_id = -1, second_tab_id = -1;
+  provider->ProvideTabId(base::Bind(&CaptureTabId, &first_tab_id));
+  provider->ProvideTabId(base::Bind(&CaptureTabId, &second_tab_id));
+
+  // Then, destroy the |provider| before the tab ID getter callback or any other
+  // callbacks are run.
+  provider.reset();
+
+  // The callbacks should still complete successfully later even though the
+  // |provider| no longer exists.
+  run_loop()->RunUntilIdle();
+  EXPECT_EQ(1, tab_id_getter_call_count());
+  EXPECT_EQ(kTabId, first_tab_id);
+  EXPECT_EQ(kTabId, second_tab_id);
+}
+
+}  // namespace
+
+}  // namespace chrome_browser_data_usage