Add additional histograms with suffixes to ImportantFileWriter.

base/files/important_file_writer_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 "base/files/important_file_writer.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/test/histogram_tester.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "base/timer/mock_timer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
 
@@ skipping 290 matching lines @@
   writer.ScheduleWrite(&serializer);
   EXPECT_TRUE(writer.HasPendingWrite());
 
   writer.DoScheduledWrite();
   EXPECT_FALSE(timer.IsRunning());
   EXPECT_FALSE(writer.HasPendingWrite());
   RunLoop().RunUntilIdle();
   EXPECT_FALSE(PathExists(writer.path()));
 }
 
+TEST_F(ImportantFileWriterTest, WriteFileAtomicallyHistogramSuffixTest) {
+  base::HistogramTester histogram_tester;
+  EXPECT_FALSE(PathExists(file_));
+  EXPECT_TRUE(ImportantFileWriter::WriteFileAtomically(file_, "baz", "test"));
+  EXPECT_TRUE(PathExists(file_));
+  EXPECT_EQ("baz", GetFileContent(file_));
+  histogram_tester.ExpectTotalCount("ImportantFile.FileCreateError", 0);
+  histogram_tester.ExpectTotalCount("ImportantFile.FileCreateError.test", 0);
+
+  FilePath invalid_file_ = FilePath().AppendASCII("bad/../path");
+  EXPECT_FALSE(PathExists(invalid_file_));
+  EXPECT_FALSE(
+      ImportantFileWriter::WriteFileAtomically(invalid_file_, nullptr));
+  histogram_tester.ExpectTotalCount("ImportantFile.FileCreateError", 1);
+  histogram_tester.ExpectTotalCount("ImportantFile.FileCreateError.test", 0);
+  EXPECT_FALSE(
+      ImportantFileWriter::WriteFileAtomically(invalid_file_, nullptr, "test"));
+  histogram_tester.ExpectTotalCount("ImportantFile.FileCreateError", 1);
+  histogram_tester.ExpectTotalCount("ImportantFile.FileCreateError.test", 1);
+}
+
 }  // namespace base