Add ability to retrieve a thread_name given a thread_id.

base/threading/thread_id_name_manager_unittest.cc

Index: base/threading/thread_id_name_manager_unittest.cc
diff --git a/base/threading/thread_id_name_manager_unittest.cc b/base/threading/thread_id_name_manager_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a74e683df68c268c1e6fc0e71a85f0a7c4b073f6
--- /dev/null
+++ b/base/threading/thread_id_name_manager_unittest.cc
@@ -0,0 +1,71 @@
+// Copyright (c) 2012 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 "base/threading/thread_id_name_manager.h"
+
+#include "base/threading/platform_thread.h"
+#include "base/threading/thread.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
+
+typedef PlatformTest ThreadIdNameManagerTest;
+
+namespace {
+
+static const char* kAThread = "a thread";
+static const char* kBThread = "b thread";
+
+TEST_F(ThreadIdNameManagerTest, AddThreads) {
+  base::ThreadIdNameManager* manager = base::ThreadIdNameManager::GetInstance();
+  base::Thread a(kAThread);

[jar (doing other things), 2012/12/06 20:54:37]

nit: avoid such use of single letter names.  Better would be thread_a or such.

[dsinclair, 2012/12/10 16:24:36]

Done.

+  base::Thread b(kBThread);
+
+  a.Start();
+  b.Start();
+  EXPECT_STREQ(kAThread, manager->GetNameForId(a.thread_id()));
+  EXPECT_STREQ(kBThread, manager->GetNameForId(b.thread_id()));
+  b.Stop();
+  a.Stop();
+}
+
+TEST_F(ThreadIdNameManagerTest, RemoveThreads) {
+  base::ThreadIdNameManager* manager = base::ThreadIdNameManager::GetInstance();
+  base::Thread a(kAThread);
+
+  a.Start();
+  base::PlatformThreadId b_id;
+  {
+    base::Thread b(kBThread);
+    b.Start();
+    b_id = b.thread_id();
+    b.Stop();
+  }
+  a.Stop();
+
+  EXPECT_STREQ(kAThread, manager->GetNameForId(a.thread_id()));
+  EXPECT_EQ(NULL, manager->GetNameForId(b_id));
+}
+
+TEST_F(ThreadIdNameManagerTest, RestartThread) {
+  base::ThreadIdNameManager* manager = base::ThreadIdNameManager::GetInstance();
+  base::Thread a(kAThread);
+
+  a.Start();
+  base::PlatformThreadId a_id = a.thread_id();
+  a.Stop();
+  EXPECT_STREQ(kAThread, manager->GetNameForId(a_id));
+
+  a.Start();
+  a.Stop();
+  EXPECT_STREQ(kAThread, manager->GetNameForId(a_id));
+}
+
+TEST_F(ThreadIdNameManagerTest, PointerStaysSame) {
+  base::ThreadIdNameManager* manager = base::ThreadIdNameManager::GetInstance();
+  manager->SetNameForId(1, kAThread);
+
+  EXPECT_EQ(kAThread, manager->GetNameForId(1));
+}
+
+}  // namespace