[chromedriver] Add an error autoreporting feature that automatically raises errors from browser logs

chrome/test/chromedriver/logging_unittest.cc

 // Copyright (c) 2013 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/values.h"
 #include "chrome/test/chromedriver/capabilities.h"
 #include "chrome/test/chromedriver/chrome/devtools_event_listener.h"
 #include "chrome/test/chromedriver/chrome/log.h"
 #include "chrome/test/chromedriver/chrome/status.h"
 #include "chrome/test/chromedriver/logging.h"
@@ skipping 117 matching lines @@
   Capabilities capabilities;
 
   ScopedVector<DevToolsEventListener> listeners;
   ScopedVector<WebDriverLog> logs;
   Status status = CreateLogs(capabilities, &logs, &listeners);
   EXPECT_TRUE(status.IsOk());
   ASSERT_EQ(1u, logs.size());
   ASSERT_EQ(1u, listeners.size());
   ASSERT_EQ("browser", logs[0]->type());
 }
+
+TEST(Logging, GetFirstErrorMessage) {
+  WebDriverLog log(WebDriverLog::kBrowserType, Log::kAll);
+  std::string entry;
+
+  entry = log.GetFirstErrorMessage();
+  ASSERT_TRUE(entry.empty());
+
+  log.AddEntry(Log::kInfo, "info message");
+  log.AddEntry(Log::kError, "first error message");
+  log.AddEntry(Log::kDebug, "debug message");
+  log.AddEntry(Log::kError, "second error message");
+
+  entry = log.GetFirstErrorMessage();
+  ASSERT_EQ("first error message", entry);
+}