Add a unit test for ProcessWatcher::EnsureProcessTerminated().

chrome/common/process_watcher_unittest.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 "base/platform_thread.h"
+#include "base/multiprocess_test.h"
+#include "chrome/common/process_watcher.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class ProcessWatcherTest : public MultiProcessTest {
+};
+
+MULTIPROCESS_TEST_MAIN(Sleep1ChildProcess) {
+  PlatformThread::Sleep(1000);
+  exit(0);
+  return 0;
+}
+
+MULTIPROCESS_TEST_MAIN(Sleep3ChildProcess) {
+  PlatformThread::Sleep(3000);
+  exit(0);
+  return 0;
+}
+
+TEST_F(ProcessWatcherTest, DiesBeforeTermination) {
+  base::ProcessHandle handle = this->SpawnChild(L"Sleep1ChildProcess");
+  ASSERT_NE(static_cast<base::ProcessHandle>(NULL), handle);
+
+  ProcessWatcher::EnsureProcessTerminated(handle);
+
+  PlatformThread::Sleep(2500);
+  // Normally we don't touch |handle| after calling EnsureProcessTerminated,
+  // but we know the EnsureProcessTerminated process finishes in 2000 ms, so
+  // it's safe to do so now. Same for Terminated test case below.
+  EXPECT_FALSE(base::CrashAwareSleep(handle, 0));
+}
+
+TEST_F(ProcessWatcherTest, Terminated) {
+  base::ProcessHandle handle = this->SpawnChild(L"Sleep3ChildProcess");
+  ASSERT_NE(static_cast<base::ProcessHandle>(NULL), handle);
+
+  ProcessWatcher::EnsureProcessTerminated(handle);
+
+  PlatformThread::Sleep(2500);
+  EXPECT_FALSE(base::CrashAwareSleep(handle, 0));
+}
+
+TEST_F(ProcessWatcherTest, NotTerminated) {
+  base::ProcessHandle handle = this->SpawnChild(L"Sleep3ChildProcess");
+  ASSERT_NE(static_cast<base::ProcessHandle>(NULL), handle);
+
+  EXPECT_TRUE(base::CrashAwareSleep(handle, 2500));
+  EXPECT_FALSE(base::CrashAwareSleep(handle, 1000));
+}
+
+}  // namespace