Add FileWriteMode::kCreateOrFail

test/file.cc

Index: test/file.cc
diff --git a/test/file.cc b/test/file.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9c007433422e4a97d2fa84dfe3218e0cf42f4f7f
--- /dev/null
+++ b/test/file.cc
@@ -0,0 +1,66 @@
+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "test/file.h"
+
+#include <errno.h>
+#include <sys/stat.h>
+
+#include "gtest/gtest.h"
+#include "test/errors.h"
+
+namespace crashpad {
+namespace test {
+
+bool FileExists(const base::FilePath& path) {
+#if defined(OS_POSIX)
+  struct stat st;
+  int rv = lstat(path.value().c_str(), &st);
+  const char stat_function[] = "lstat";
+#elif defined(OS_WIN)
+  struct _stat st;
+  int rv = _wstat(path.value().c_str(), &st);
+  const char stat_function[] = "_wstat";
+#else
+#error "Not implemented"
+#endif
+  if (rv < 0) {
+    EXPECT_EQ(ENOENT, errno) << ErrnoMessage(stat_function) << " "
+                             << path.value();
+    return false;
+  }
+  return true;
+}
+
+FileOffset FileSize(const base::FilePath& path) {
+#if defined(OS_POSIX)
+  struct stat st;
+  int rv = lstat(path.value().c_str(), &st);
+  const char stat_function[] = "lstat";
+#elif defined(OS_WIN)
+  struct _stati64 st;
+  int rv = _wstati64(path.value().c_str(), &st);
+  const char stat_function[] = "_wstati64";
+#else
+#error "Not implemented"
+#endif
+  if (rv < 0) {
+    ADD_FAILURE() << ErrnoMessage(stat_function) << " " << path.value();
+    return -1;
+  }
+  return st.st_size;
+}
+
+}  // namespace test
+}  // namespace crashpad