It's a copy of http://codereview.chromium.org/155772, with the fix for valgri...

chrome/browser/process_singleton_linux_uitest.cc

+// Copyright (c) 2009 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/process_singleton.h"
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <unistd.h>
+#include <vector>
+#include <string>
+
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "base/string_util.h"
+#include "base/thread.h"
+#include "chrome/browser/browser.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/common/chrome_constants.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/test/chrome_process_util.h"
+#include "chrome/test/ui/ui_test.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+class ProcessSingletonLinuxTest : public UITest {
+ protected:
+  // A helper method to call ProcessSingleton::NotifyOtherProcess().
+  // |url| will be added to CommandLine for current process, so that it can be
+  // sent to browser process by ProcessSingleton::NotifyOtherProcess().
+  void NotifyOtherProcess(const std::string& url, bool expect_result) {
+    FilePath user_data_dir;
+    PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
+
+    std::vector<std::string> old_argv =
+        CommandLine::ForCurrentProcess()->argv();
+    std::vector<std::string> argv;
+    argv.push_back(old_argv[0]);
+    argv.push_back(url);
+
+    CommandLine::Reset();
+    CommandLine::Init(argv);
+
+    ProcessSingleton process_singleton(user_data_dir);
+
+    if (expect_result)
+      EXPECT_TRUE(process_singleton.NotifyOtherProcess());
+    else
+      EXPECT_FALSE(process_singleton.NotifyOtherProcess());
+  }
+};
+
+// Test if the socket file and symbol link created by ProcessSingletonLinux
+// are valid. When running this test, the ProcessSingleton object is already
+// initiated by UITest. So we just test against this existing object.
+TEST_F(ProcessSingletonLinuxTest, CheckSocketFile) {
+  FilePath user_data_dir;
+  FilePath path;
+  PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
+
+  path = user_data_dir.Append(chrome::kSingletonSocketFilename);
+
+  struct stat statbuf;
+  ASSERT_EQ(0, lstat(path.value().c_str(), &statbuf));
+  ASSERT_TRUE(S_ISLNK(statbuf.st_mode));
+  char buf[PATH_MAX + 1];
+  ssize_t len = readlink(path.value().c_str(), buf, PATH_MAX);
+  ASSERT_GT(len, 0);
+  buf[len] = '\0';
+
+  path = user_data_dir.Append(buf);
+  ASSERT_EQ(0, lstat(path.value().c_str(), &statbuf));
+  ASSERT_TRUE(S_ISSOCK(statbuf.st_mode));
+}
+
+// TODO(james.su@gmail.com): port following tests to Windows.
+// Test success case of NotifyOtherProcess().
+TEST_F(ProcessSingletonLinuxTest, NotifyOtherProcessSuccess) {
+  std::string url("about:blank");
+  int original_tab_count = GetTabCount();
+
+  NotifyOtherProcess(url, true);
+  EXPECT_EQ(original_tab_count + 1, GetTabCount());
+  EXPECT_EQ(url, GetActiveTabURL().spec());
+}
+
+// Test failure case of NotifyOtherProcess().
+TEST_F(ProcessSingletonLinuxTest, NotifyOtherProcessFailure) {
+  base::ProcessId pid = ChromeBrowserProcessId(user_data_dir());
+
+  ASSERT_GT(pid, 1);
+
+  // Block the browser process, then it'll be killed by
+  // ProcessSingleton::NotifyOtherProcess().
+  kill(pid, SIGSTOP);
+
+  // Wait for a while to make sure the browser process is actually stopped.
+  // It's necessary when running with valgrind.
+  sleep(1);
+
+  std::string url("about:blank");
+  NotifyOtherProcess(url, false);
+
+  // Wait for a while to make sure the browser process is actually killed.
+  sleep(1);
+
+  EXPECT_FALSE(IsBrowserRunning());
+}