Introduce base::ScopedPlatformHandle

base/files/scoped_platform_handle_unittest.cc

+// Copyright 2017 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/scoped_platform_handle.h"
+
+#include "base/files/file.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/macros.h"
+#include "base/strings/stringprintf.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+
+#include "base/win/scoped_handle.h"
+#elif defined(OS_POSIX)
+#include "base/files/scoped_file.h"
+#endif
+
+namespace base {
+namespace {
+
+class ScopedPlatformHandleTest : public testing::Test {
+ public:
+  ScopedPlatformHandleTest() { CHECK(temp_dir_.CreateUniqueTempDir()); }
+
+ protected:
+  ScopedPlatformHandle CreateValidHandle() {
+    return ScopedPlatformHandle(OpenTempFile().TakePlatformFile());
+  }
+
+ private:
+  base::File OpenTempFile() {
+    base::File temp_file(temp_dir_.GetPath().AppendASCII(
+                             base::StringPrintf("file_%d", next_file_id_)),
+                         base::File::FLAG_CREATE | base::File::FLAG_WRITE);
+    ++next_file_id_;
+    return temp_file;
+  }
+
+  ScopedTempDir temp_dir_;
+  int next_file_id_ = 1;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedPlatformHandleTest);
+};
+
+TEST_F(ScopedPlatformHandleTest, Invalid) {
+  ScopedPlatformHandle default_value;
+  EXPECT_TRUE(!default_value.is_valid());
+
+  ScopedPlatformHandle null_value(nullptr);
+  EXPECT_TRUE(!null_value.is_valid());
+
+  default_value.reset();
+  null_value.reset();
+  EXPECT_TRUE(!default_value.is_valid());
+  EXPECT_TRUE(!null_value.is_valid());
+}
+
+TEST_F(ScopedPlatformHandleTest, BasicUsage) {
+  ScopedPlatformHandle handle_a = CreateValidHandle();
+  ScopedPlatformHandle handle_b = CreateValidHandle();
+  EXPECT_TRUE(handle_a.is_valid());
+  EXPECT_TRUE(handle_b.is_valid());
+
+  ScopedPlatformHandle::HandleType handle_a_value = handle_a.get();
+  ScopedPlatformHandle::HandleType handle_b_value = handle_b.get();
+  EXPECT_TRUE(handle_a.is_valid());
+  EXPECT_TRUE(handle_b.is_valid());
+
+  ScopedPlatformHandle::ScopedHandleType scoped_handle = handle_a.Take();
+  ScopedPlatformHandle::HandleType raw_handle = handle_b.release();
+  EXPECT_FALSE(handle_a.is_valid());
+  EXPECT_FALSE(handle_b.is_valid());
+
+  handle_a = ScopedPlatformHandle(std::move(scoped_handle));
+  handle_b = ScopedPlatformHandle(raw_handle);
+  EXPECT_TRUE(handle_a.is_valid());
+  EXPECT_TRUE(handle_b.is_valid());
+  EXPECT_EQ(handle_a_value, handle_a.get());
+  EXPECT_EQ(handle_b_value, handle_b.get());
+
+  handle_b = std::move(handle_a);
+  EXPECT_FALSE(handle_a.is_valid());
+  EXPECT_TRUE(handle_b.is_valid());
+  EXPECT_EQ(handle_a_value, handle_b.get());
+
+  handle_b.reset();
+  EXPECT_FALSE(handle_b.is_valid());
+}
+
+}  // namespace
+}  // namespace base