Add GetAppOutput function, a better replacement for popen.

base/process_util_unittest.cc

 // Copyright (c) 2006-2008 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.
 
 #define _CRT_SECURE_NO_WARNINGS
 
+#include "base/command_line.h"
 #include "base/multiprocess_test.h"
 #include "base/platform_thread.h"
 #include "base/process_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_LINUX)
 #include <dlfcn.h>
 #endif
 #if defined(OS_POSIX)
 #include <fcntl.h>
@@ skipping 194 matching lines @@
   ASSERT_EQ(0, num_open_files);
 
   EXPECT_TRUE(WaitForSingleProcess(handle, 1000));
   base::CloseProcessHandle(handle);
   close(fds[0]);
   close(sockets[0]);
   close(sockets[1]);
   close(dev_null);
 }
 
+TEST_F(ProcessUtilTest, GetAppOutput) {
+  std::string output;
+  EXPECT_TRUE(GetAppOutput(CommandLine(L"true"), &output));
+  EXPECT_STREQ("", output.c_str());
+
+  EXPECT_FALSE(GetAppOutput(CommandLine(L"false"), &output));
+
+  std::vector<std::string> argv;
+  argv.push_back("/bin/echo");
+  argv.push_back("-n");
+  argv.push_back("foobar42");
+  EXPECT_TRUE(GetAppOutput(CommandLine(argv), &output));
+  EXPECT_STREQ("foobar42", output.c_str());
+}
+
 #endif  // defined(OS_POSIX)
 
 }  // namespace base