Refactor AppendToFile and WriteFileDescriptor

chromeos/process_proxy/process_output_watcher_unittest.cc

 // Copyright (c) 2012 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 <gtest/gtest.h>
 
 #include <queue>
 #include <string>
 #include <vector>
 
@@ skipping 132 matching lines @@
       base::RunLoop run_loop;
       ASSERT_TRUE(test_case_done_callback_.is_null());
       test_case_done_callback_ = run_loop.QuitClosure();
 
       const std::string& test_str = test_cases[i].input;
       // Let's make inputs not NULL terminated, unless other is specified in
       // the test case.
       ssize_t test_size = test_str.length() * sizeof(*test_str.c_str());
       if (test_cases[i].should_send_terminating_null)
         test_size += sizeof(*test_str.c_str());
-      EXPECT_EQ(test_size,
-                base::WriteFileDescriptor(pt_pipe[1], test_str.c_str(),
-                                          test_size));
+      EXPECT_TRUE(base::WriteFileDescriptor(pt_pipe[1], test_str.c_str(),
+                                            test_size));
 
       run_loop.Run();
       EXPECT_TRUE(expectations_.IsDone());
       if (failed_)
         break;
     }
 
     // Send stop signal. It is not important which string we send.
-    EXPECT_EQ(1, base::WriteFileDescriptor(stop_pipe[1], "q", 1));
+    EXPECT_TRUE(base::WriteFileDescriptor(stop_pipe[1], "q", 1));
 
     EXPECT_NE(-1, IGNORE_EINTR(close(stop_pipe[1])));
     EXPECT_NE(-1, IGNORE_EINTR(close(pt_pipe[1])));
   }
 
  private:
   base::Closure test_case_done_callback_;
   base::MessageLoop message_loop_;
   scoped_ptr<base::Thread> output_watch_thread_;
   bool output_watch_thread_started_;
@@ skipping 134 matching lines @@
   // This will send '\0' to output watcher.
   test_cases.push_back(TestCase("", true));
   // Let's verify that next input also gets detected (i.e. output watcher does
   // not exit after seeing '\0' from previous test case).
   test_cases.push_back(TestCase("a", true));
 
   RunTest(test_cases);
 }
 
 }  // namespace chromeos