Cast device revocation checking.

components/cast_certificate/cast_cert_validator_test_helpers.cc

 // Copyright 2016 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 "components/cast_certificate/cast_cert_validator_test_helpers.h"
 
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "net/cert/pem_tokenizer.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 68 matching lines @@
     }
   }
 
   EXPECT_FALSE(result.message.empty());
   EXPECT_FALSE(result.signature_sha1.empty());
   EXPECT_FALSE(result.signature_sha256.empty());
 
   return result;
 }
 
+std::string ReadFromFile(const base::StringPiece& file_name) {

[eroman, 2016/07/12 21:22:00]

This function seems unnecessary -- How about instead just exposing
ReadTestFileToString() in the header?
(You can add the EXPECT_FALSE() into it if you like too).

[ryanchung, 2016/07/14 16:15:25]

Done.

+  std::string file_data = ReadTestFileToString(file_name);
+
+  EXPECT_FALSE(file_data.empty());
+  return file_data;
+}
+
 }  // namespace testing
 
 }  // namespace cast_certificate