Code to collect issue 97285 debugging info for crash reports.

content/common/content_debug_logging_unittest.cc

+// Copyright (c) 2011 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 "content/public/common/content_debug_logging.h"
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+// Makes sure that the handlers are cleared during teardown.
+class ContentDebugLoggingTest : public testing::Test {
+ public:
+  ContentDebugLoggingTest() {}
+  virtual ~ContentDebugLoggingTest() {}
+
+  void SetUp() {
+    messages.clear();
+    content::debug::RegisterMessageHandlers(
+        ContentDebugLoggingTest::RecordMsg,
+        ContentDebugLoggingTest::GetMessages);
+  }
+
+  void TearDown() {
+    // Clean up side effects.
+    messages.clear();
+    content::debug::RegisterMessageHandlers(NULL, NULL);
+  }
+
+  // Map bug ids to messages for that bug.
+  static std::map<int, std::vector<std::string> > messages;

[Bernhard Bauer, 2012/09/05 15:04:55]

Could you make this a pointer to avoid the static initializer?

[Scott Hess - ex-Googler, 2012/09/05 17:17:05]

Hmm, and then the handler functions can just watch the pointer and be safer. 
OK.

+
+  static void RecordMsg(int bug_id, const std::string& msg) {
+    messages[bug_id].push_back(msg);
+  }
+
+  static bool GetMessages(int bug_id, std::vector<std::string>* msgs) {
+    std::vector<std::string>& bug_messages = messages[bug_id];
+    msgs->assign(bug_messages.begin(), bug_messages.end());
+    return !msgs->empty();
+  }
+};
+
+// static
+std::map<int, std::vector<std::string> > ContentDebugLoggingTest::messages;
+
+TEST_F(ContentDebugLoggingTest, NullLogging) {
+  content::debug::RegisterMessageHandlers(NULL, NULL);
+
+  const std::string kMessage("This is a test");
+  const int kBug = 1;
+  content::debug::RecordMsg(kBug, kMessage);
+
+  // Cannot get the message back.
+  std::vector<std::string> bug_messages;
+  EXPECT_FALSE(content::debug::GetMessages(kBug, &bug_messages));
+  EXPECT_EQ(bug_messages.size(), 0u);
+}
+
+TEST_F(ContentDebugLoggingTest, BasicLogging) {
+  const std::string kMessage("This is a test");
+  const int kBug = 1;
+  content::debug::RecordMsg(kBug, kMessage);
+
+  // The message was stored and can be retrieved.
+  std::vector<std::string> bug_messages;
+  EXPECT_TRUE(content::debug::GetMessages(kBug, &bug_messages));
+  EXPECT_EQ(bug_messages.size(), 1u);
+  EXPECT_EQ(bug_messages[0], kMessage);
+}
+
+TEST_F(ContentDebugLoggingTest, SeparateBugs) {
+  const std::string kMessage("This is a test");
+  const int kBug = 1;
+  content::debug::RecordMsg(kBug, kMessage);
+
+  content::debug::RecordMsg(17, std::string("Some other message"));
+
+  // Only get the message for this bug back.
+  std::vector<std::string> bug_messages;
+  EXPECT_TRUE(content::debug::GetMessages(kBug, &bug_messages));
+  EXPECT_EQ(bug_messages.size(), 1u);
+  EXPECT_EQ(bug_messages[0], kMessage);
+
+  // There are messages for multiple bugs, though.
+  EXPECT_EQ(messages.size(), 2u);
+}
+
+}  // namespace