FileUtilsTest DirExists function added

webrtc/test/testsupport/fileutils_unittest.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 132 matching lines @@
       "Failed to write to file: " << temp_filename;
   fclose(file);
   ASSERT_GT(webrtc::test::GetFileSize(std::string(temp_filename.c_str())), 0u);
   remove(temp_filename.c_str());
 }
 
 TEST_F(FileUtilsTest, GetFileSizeNonExistingFile) {
   ASSERT_EQ(0u, webrtc::test::GetFileSize("non-existing-file.tmp"));
 }
 
+TEST_F(FileUtilsTest, DirExists) {
+  // Check that an existing directory is recognized as such.
+  ASSERT_TRUE(webrtc::test::DirExists(webrtc::test::OutputPath()))
+      << "Existing directory not found";
+
+  // Check that a non-existing directory is recognized as such.
+  std::string directory = "direxists-unittest-non_existing-dir";
+  ASSERT_FALSE(webrtc::test::DirExists(directory))
+      << "Non-existing directory found";
+
+  // Check that an existing file is not recognized as an existing directory.
+  std::string temp_filename = webrtc::test::TempFilename(
+      webrtc::test::OutputPath(), "TempFilenameTest");
+  ASSERT_TRUE(webrtc::test::FileExists(temp_filename))
+      << "Couldn't find file: " << temp_filename;
+  ASSERT_FALSE(webrtc::test::DirExists(temp_filename))
+      << "Existing file recognized as existing directory";
+  remove(temp_filename.c_str());
+}
+
 }  // namespace webrtc