For c++, Generate enum classes instead of enum from mojom.

services/files/file_impl_unittest.cc

 // Copyright 2015 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 <vector>
 
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/bindings/type_converter.h"
 #include "services/files/files_test_base.h"
 
 namespace mojo {
 namespace files {
 namespace {
 
 using FileImplTest = FilesTestBase;
 
 TEST_F(FileImplTest, CreateWriteCloseRenameOpenRead) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   {
     // Create my_file.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("my_file", GetProxy(&file),
                         kOpenFlagWrite | kOpenFlagCreate, Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Write to it.
     std::vector<uint8_t> bytes_to_write;
     bytes_to_write.push_back(static_cast<uint8_t>('h'));
     bytes_to_write.push_back(static_cast<uint8_t>('e'));
     bytes_to_write.push_back(static_cast<uint8_t>('l'));
     bytes_to_write.push_back(static_cast<uint8_t>('l'));
     bytes_to_write.push_back(static_cast<uint8_t>('o'));
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     uint32_t num_bytes_written = 0;
-    file->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+    file->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
                 Capture(&error, &num_bytes_written));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
     EXPECT_EQ(bytes_to_write.size(), num_bytes_written);
 
     // Close it.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     file->Close(Capture(&error));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
   }
 
   // Rename it.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   directory->Rename("my_file", "your_file", Capture(&error));
   ASSERT_TRUE(directory.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   {
     // Open my_file again.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("your_file", GetProxy(&file), kOpenFlagRead,
                         Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Read from it.
     Array<uint8_t> bytes_read;
-    error = ERROR_INTERNAL;
-    file->Read(3, 1, WHENCE_FROM_START, Capture(&error, &bytes_read));
+    error = Error::INTERNAL;
+    file->Read(3, 1, Whence::FROM_START, Capture(&error, &bytes_read));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
     ASSERT_EQ(3u, bytes_read.size());
     EXPECT_EQ(static_cast<uint8_t>('e'), bytes_read[0]);
     EXPECT_EQ(static_cast<uint8_t>('l'), bytes_read[1]);
     EXPECT_EQ(static_cast<uint8_t>('l'), bytes_read[2]);
   }
 
   // TODO(vtl): Test read/write offset options.
 }
 
 TEST_F(FileImplTest, CantWriteInReadMode) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   std::vector<uint8_t> bytes_to_write;
   bytes_to_write.push_back(static_cast<uint8_t>('h'));
   bytes_to_write.push_back(static_cast<uint8_t>('e'));
   bytes_to_write.push_back(static_cast<uint8_t>('l'));
   bytes_to_write.push_back(static_cast<uint8_t>('l'));
   bytes_to_write.push_back(static_cast<uint8_t>('o'));
 
   {
     // Create my_file.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("my_file", GetProxy(&file),
                         kOpenFlagWrite | kOpenFlagCreate, Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Write to it.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     uint32_t num_bytes_written = 0;
-    file->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+    file->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
                 Capture(&error, &num_bytes_written));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
     EXPECT_EQ(bytes_to_write.size(), num_bytes_written);
 
     // Close it.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     file->Close(Capture(&error));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
   }
 
   {
     // Open my_file again, this time with read only mode.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("my_file", GetProxy(&file), kOpenFlagRead,
                         Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Try to write in read mode; it should fail.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     uint32_t num_bytes_written = 0;
-    file->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+    file->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
                 Capture(&error, &num_bytes_written));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_UNKNOWN, error);
+    EXPECT_EQ(Error::UNKNOWN, error);
     EXPECT_EQ(0u, num_bytes_written);
 
     // Close it.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     file->Close(Capture(&error));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
   }
 }
 
 TEST_F(FileImplTest, OpenExclusive) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   {
     // Create my_file.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("temp_file", GetProxy(&file),
                         kOpenFlagWrite | kOpenFlagCreate |kOpenFlagExclusive,
                         Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Close it.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     file->Close(Capture(&error));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
   }
 
   {
     // Try to open my_file again in exclusive mode; it should fail.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("temp_file", GetProxy(&file),
                         kOpenFlagWrite | kOpenFlagCreate | kOpenFlagExclusive,
                         Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_UNKNOWN, error);
+    EXPECT_EQ(Error::UNKNOWN, error);
   }
 }
 
 TEST_F(FileImplTest, OpenInAppendMode) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   {
     // Create my_file.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("my_file", GetProxy(&file),
                         kOpenFlagWrite | kOpenFlagCreate, Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Write to it.
     std::vector<uint8_t> bytes_to_write;
     bytes_to_write.push_back(static_cast<uint8_t>('h'));
     bytes_to_write.push_back(static_cast<uint8_t>('e'));
     bytes_to_write.push_back(static_cast<uint8_t>('l'));
     bytes_to_write.push_back(static_cast<uint8_t>('l'));
     bytes_to_write.push_back(static_cast<uint8_t>('o'));
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     uint32_t num_bytes_written = 0;
-    file->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+    file->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
                 Capture(&error, &num_bytes_written));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
     EXPECT_EQ(bytes_to_write.size(), num_bytes_written);
 
     // Close it.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     file->Close(Capture(&error));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
   }
 
   {
     // Append to my_file.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("my_file", GetProxy(&file),
                         kOpenFlagWrite | kOpenFlagAppend, Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Write to it.
     std::vector<uint8_t> bytes_to_write;
     bytes_to_write.push_back(static_cast<uint8_t>('g'));
     bytes_to_write.push_back(static_cast<uint8_t>('o'));
     bytes_to_write.push_back(static_cast<uint8_t>('o'));
     bytes_to_write.push_back(static_cast<uint8_t>('d'));
     bytes_to_write.push_back(static_cast<uint8_t>('b'));
     bytes_to_write.push_back(static_cast<uint8_t>('y'));
     bytes_to_write.push_back(static_cast<uint8_t>('e'));
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     uint32_t num_bytes_written = 0;
-    file->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+    file->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
                 Capture(&error, &num_bytes_written));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
     EXPECT_EQ(bytes_to_write.size(), num_bytes_written);
 
     // Close it.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     file->Close(Capture(&error));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
   }
 
   {
     // Open my_file again.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("my_file", GetProxy(&file), kOpenFlagRead,
                         Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Read from it.
     Array<uint8_t> bytes_read;
-    error = ERROR_INTERNAL;
-    file->Read(12, 0, WHENCE_FROM_START, Capture(&error, &bytes_read));
+    error = Error::INTERNAL;
+    file->Read(12, 0, Whence::FROM_START, Capture(&error, &bytes_read));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
     ASSERT_EQ(12u, bytes_read.size());
     EXPECT_EQ(static_cast<uint8_t>('l'), bytes_read[3]);
     EXPECT_EQ(static_cast<uint8_t>('o'), bytes_read[4]);
     EXPECT_EQ(static_cast<uint8_t>('g'), bytes_read[5]);
     EXPECT_EQ(static_cast<uint8_t>('o'), bytes_read[6]);
   }
 }
 
 TEST_F(FileImplTest, OpenInTruncateMode) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   {
     // Create my_file.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("my_file", GetProxy(&file),
                         kOpenFlagWrite | kOpenFlagCreate, Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Write to it.
     std::vector<uint8_t> bytes_to_write;
     bytes_to_write.push_back(static_cast<uint8_t>('h'));
     bytes_to_write.push_back(static_cast<uint8_t>('e'));
     bytes_to_write.push_back(static_cast<uint8_t>('l'));
     bytes_to_write.push_back(static_cast<uint8_t>('l'));
     bytes_to_write.push_back(static_cast<uint8_t>('o'));
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     uint32_t num_bytes_written = 0;
-    file->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+    file->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
                 Capture(&error, &num_bytes_written));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
     EXPECT_EQ(bytes_to_write.size(), num_bytes_written);
 
     // Close it.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     file->Close(Capture(&error));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
   }
 
   {
     // Append to my_file.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("my_file", GetProxy(&file),
                         kOpenFlagWrite | kOpenFlagTruncate, Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Write to it.
     std::vector<uint8_t> bytes_to_write;
     bytes_to_write.push_back(static_cast<uint8_t>('g'));
     bytes_to_write.push_back(static_cast<uint8_t>('o'));
     bytes_to_write.push_back(static_cast<uint8_t>('o'));
     bytes_to_write.push_back(static_cast<uint8_t>('d'));
     bytes_to_write.push_back(static_cast<uint8_t>('b'));
     bytes_to_write.push_back(static_cast<uint8_t>('y'));
     bytes_to_write.push_back(static_cast<uint8_t>('e'));
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     uint32_t num_bytes_written = 0;
-    file->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+    file->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
                 Capture(&error, &num_bytes_written));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
     EXPECT_EQ(bytes_to_write.size(), num_bytes_written);
 
     // Close it.
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     file->Close(Capture(&error));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
   }
 
   {
     // Open my_file again.
     FilePtr file;
-    error = ERROR_INTERNAL;
+    error = Error::INTERNAL;
     directory->OpenFile("my_file", GetProxy(&file), kOpenFlagRead,
                         Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
 
     // Read from it.
     Array<uint8_t> bytes_read;
-    error = ERROR_INTERNAL;
-    file->Read(7, 0, WHENCE_FROM_START, Capture(&error, &bytes_read));
+    error = Error::INTERNAL;
+    file->Read(7, 0, Whence::FROM_START, Capture(&error, &bytes_read));
     ASSERT_TRUE(file.WaitForIncomingResponse());
-    EXPECT_EQ(ERROR_OK, error);
+    EXPECT_EQ(Error::OK, error);
     ASSERT_EQ(7u, bytes_read.size());
     EXPECT_EQ(static_cast<uint8_t>('g'), bytes_read[0]);
     EXPECT_EQ(static_cast<uint8_t>('o'), bytes_read[1]);
     EXPECT_EQ(static_cast<uint8_t>('o'), bytes_read[2]);
     EXPECT_EQ(static_cast<uint8_t>('d'), bytes_read[3]);
   }
 }
 
 // Note: Ignore nanoseconds, since it may not always be supported. We expect at
 // least second-resolution support though.
 TEST_F(FileImplTest, StatTouch) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   // Create my_file.
   FilePtr file;
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   directory->OpenFile("my_file", GetProxy(&file),
                       kOpenFlagWrite | kOpenFlagCreate, Capture(&error));
   ASSERT_TRUE(directory.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // Stat it.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   FileInformationPtr file_info;
   file->Stat(Capture(&error, &file_info));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   ASSERT_FALSE(file_info.is_null());
-  EXPECT_EQ(FILE_TYPE_REGULAR_FILE, file_info->type);
+  EXPECT_EQ(FileType::REGULAR_FILE, file_info->type);
   EXPECT_EQ(0, file_info->size);
   ASSERT_FALSE(file_info->atime.is_null());
   EXPECT_GT(file_info->atime->seconds, 0);  // Expect that it's not 1970-01-01.
   ASSERT_FALSE(file_info->mtime.is_null());
   EXPECT_GT(file_info->mtime->seconds, 0);
   int64_t first_mtime = file_info->mtime->seconds;
 
   // Touch only the atime.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   TimespecOrNowPtr t(TimespecOrNow::New());
   t->now = false;
   t->timespec = Timespec::New();
   const int64_t kPartyTime1 = 1234567890;  // Party like it's 2009-02-13.
   t->timespec->seconds = kPartyTime1;
   file->Touch(t.Pass(), nullptr, Capture(&error));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // Stat again.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   file_info.reset();
   file->Stat(Capture(&error, &file_info));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   ASSERT_FALSE(file_info.is_null());
   ASSERT_FALSE(file_info->atime.is_null());
   EXPECT_EQ(kPartyTime1, file_info->atime->seconds);
   ASSERT_FALSE(file_info->mtime.is_null());
   EXPECT_EQ(first_mtime, file_info->mtime->seconds);
 
   // Touch only the mtime.
   t = TimespecOrNow::New();
   t->now = false;
   t->timespec = Timespec::New();
   const int64_t kPartyTime2 = 1425059525;  // No time like the present.
   t->timespec->seconds = kPartyTime2;
   file->Touch(nullptr, t.Pass(), Capture(&error));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // Stat again.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   file_info.reset();
   file->Stat(Capture(&error, &file_info));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   ASSERT_FALSE(file_info.is_null());
   ASSERT_FALSE(file_info->atime.is_null());
   EXPECT_EQ(kPartyTime1, file_info->atime->seconds);
   ASSERT_FALSE(file_info->mtime.is_null());
   EXPECT_EQ(kPartyTime2, file_info->mtime->seconds);
 
   // TODO(vtl): Also test non-zero file size.
   // TODO(vtl): Also test Touch() "now" options.
   // TODO(vtl): Also test touching both atime and mtime.
 }
 
 TEST_F(FileImplTest, TellSeek) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   // Create my_file.
   FilePtr file;
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   directory->OpenFile("my_file", GetProxy(&file),
                       kOpenFlagWrite | kOpenFlagCreate, Capture(&error));
   ASSERT_TRUE(directory.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // Write to it.
   std::vector<uint8_t> bytes_to_write(1000, '!');
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   uint32_t num_bytes_written = 0;
-  file->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+  file->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
               Capture(&error, &num_bytes_written));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(bytes_to_write.size(), num_bytes_written);
   const int size = static_cast<int>(num_bytes_written);
 
   // Tell.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   int64_t position = -1;
   file->Tell(Capture(&error, &position));
   ASSERT_TRUE(file.WaitForIncomingResponse());
   // Should be at the end.
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(size, position);
 
   // Seek back 100.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   position = -1;
-  file->Seek(-100, WHENCE_FROM_CURRENT, Capture(&error, &position));
+  file->Seek(-100, Whence::FROM_CURRENT, Capture(&error, &position));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(size - 100, position);
 
   // Tell.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   position = -1;
   file->Tell(Capture(&error, &position));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(size - 100, position);
 
   // Seek to 123 from start.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   position = -1;
-  file->Seek(123, WHENCE_FROM_START, Capture(&error, &position));
+  file->Seek(123, Whence::FROM_START, Capture(&error, &position));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(123, position);
 
   // Tell.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   position = -1;
   file->Tell(Capture(&error, &position));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(123, position);
 
   // Seek to 123 back from end.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   position = -1;
-  file->Seek(-123, WHENCE_FROM_END, Capture(&error, &position));
+  file->Seek(-123, Whence::FROM_END, Capture(&error, &position));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(size - 123, position);
 
   // Tell.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   position = -1;
   file->Tell(Capture(&error, &position));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(size - 123, position);
 
   // TODO(vtl): Check that seeking actually affects reading/writing.
   // TODO(vtl): Check that seeking can extend the file?
 }
 
 TEST_F(FileImplTest, Dup) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   // Create my_file.
   FilePtr file1;
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   directory->OpenFile("my_file", GetProxy(&file1),
                       kOpenFlagRead | kOpenFlagWrite | kOpenFlagCreate,
                       Capture(&error));
   ASSERT_TRUE(directory.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // Write to it.
   std::vector<uint8_t> bytes_to_write;
   bytes_to_write.push_back(static_cast<uint8_t>('h'));
   bytes_to_write.push_back(static_cast<uint8_t>('e'));
   bytes_to_write.push_back(static_cast<uint8_t>('l'));
   bytes_to_write.push_back(static_cast<uint8_t>('l'));
   bytes_to_write.push_back(static_cast<uint8_t>('o'));
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   uint32_t num_bytes_written = 0;
-  file1->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+  file1->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
                Capture(&error, &num_bytes_written));
   ASSERT_TRUE(file1.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(bytes_to_write.size(), num_bytes_written);
   const int end_hello_pos = static_cast<int>(num_bytes_written);
 
   // Dup it.
   FilePtr file2;
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   file1->Dup(GetProxy(&file2), Capture(&error));
   ASSERT_TRUE(file1.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // |file2| should have the same position.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   int64_t position = -1;
   file2->Tell(Capture(&error, &position));
   ASSERT_TRUE(file2.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(end_hello_pos, position);
 
   // Write using |file2|.
   std::vector<uint8_t> more_bytes_to_write;
   more_bytes_to_write.push_back(static_cast<uint8_t>('w'));
   more_bytes_to_write.push_back(static_cast<uint8_t>('o'));
   more_bytes_to_write.push_back(static_cast<uint8_t>('r'));
   more_bytes_to_write.push_back(static_cast<uint8_t>('l'));
   more_bytes_to_write.push_back(static_cast<uint8_t>('d'));
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   num_bytes_written = 0;
   file2->Write(Array<uint8_t>::From(more_bytes_to_write), 0,
-               WHENCE_FROM_CURRENT, Capture(&error, &num_bytes_written));
+               Whence::FROM_CURRENT, Capture(&error, &num_bytes_written));
   ASSERT_TRUE(file2.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(more_bytes_to_write.size(), num_bytes_written);
   const int end_world_pos = end_hello_pos + static_cast<int>(num_bytes_written);
 
   // |file1| should have the same position.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   position = -1;
   file1->Tell(Capture(&error, &position));
   ASSERT_TRUE(file1.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(end_world_pos, position);
 
   // Close |file1|.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   file1->Close(Capture(&error));
   ASSERT_TRUE(file1.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // Read everything using |file2|.
   Array<uint8_t> bytes_read;
-  error = ERROR_INTERNAL;
-  file2->Read(1000, 0, WHENCE_FROM_START, Capture(&error, &bytes_read));
+  error = Error::INTERNAL;
+  file2->Read(1000, 0, Whence::FROM_START, Capture(&error, &bytes_read));
   ASSERT_TRUE(file2.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   ASSERT_EQ(static_cast<size_t>(end_world_pos), bytes_read.size());
   // Just check the first and last bytes.
   EXPECT_EQ(static_cast<uint8_t>('h'), bytes_read[0]);
   EXPECT_EQ(static_cast<uint8_t>('d'), bytes_read[end_world_pos - 1]);
 
   // TODO(vtl): Test that |file2| has the same open options as |file1|.
 }
 
 TEST_F(FileImplTest, Truncate) {
   const uint32_t kInitialSize = 1000;
   const uint32_t kTruncatedSize = 654;
 
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   // Create my_file.
   FilePtr file;
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   directory->OpenFile("my_file", GetProxy(&file),
                       kOpenFlagWrite | kOpenFlagCreate, Capture(&error));
   ASSERT_TRUE(directory.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // Write to it.
   std::vector<uint8_t> bytes_to_write(kInitialSize, '!');
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   uint32_t num_bytes_written = 0;
-  file->Write(Array<uint8_t>::From(bytes_to_write), 0, WHENCE_FROM_CURRENT,
+  file->Write(Array<uint8_t>::From(bytes_to_write), 0, Whence::FROM_CURRENT,
               Capture(&error, &num_bytes_written));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   EXPECT_EQ(kInitialSize, num_bytes_written);
 
   // Stat it.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   FileInformationPtr file_info;
   file->Stat(Capture(&error, &file_info));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   ASSERT_FALSE(file_info.is_null());
   EXPECT_EQ(kInitialSize, file_info->size);
 
   // Truncate it.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   file->Truncate(kTruncatedSize, Capture(&error));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // Stat again.
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   file_info.reset();
   file->Stat(Capture(&error, &file_info));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
   ASSERT_FALSE(file_info.is_null());
   EXPECT_EQ(kTruncatedSize, file_info->size);
 }
 
 TEST_F(FileImplTest, Ioctl) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   Error error;
 
   // Create my_file.
   FilePtr file;
-  error = ERROR_INTERNAL;
+  error = Error::INTERNAL;
   directory->OpenFile("my_file", GetProxy(&file),
                       kOpenFlagRead | kOpenFlagWrite | kOpenFlagCreate,
                       Capture(&error));
   ASSERT_TRUE(directory.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_OK, error);
+  EXPECT_EQ(Error::OK, error);
 
   // Normal files don't support any ioctls.
   Array<uint32_t> out_values;
   file->Ioctl(0, Array<uint32_t>(), Capture(&error, &out_values));
   ASSERT_TRUE(file.WaitForIncomingResponse());
-  EXPECT_EQ(ERROR_UNAVAILABLE, error);
+  EXPECT_EQ(Error::UNAVAILABLE, error);
   EXPECT_TRUE(out_values.is_null());
 }
 
 }  // namespace
 }  // namespace files
 }  // namespace mojo