[Sync] Move //sync to //components/sync.

sync/internal_api/public/util/proto_value_ptr_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 "sync/internal_api/public/util/proto_value_ptr.h"
-
-#include <memory>
-#include <utility>
-
-#include "base/macros.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace syncer {
-
-namespace {
-
-// Simple test struct that wraps an integer
-struct IntValue {
- public:
-  explicit IntValue(int value) { value_ = value; }
-  int value() { return value_; }
-
- private:
-  int value_;
-};
-
-// TestValue class is used as a template argument with ProtoValuePtr<T>
-class TestValue {
- public:
-  TestValue() : value_(nullptr), is_default_(false) {}
-  explicit TestValue(int value)
-      : value_(new IntValue(value)), is_default_(false) {}
-
-  ~TestValue() { g_delete_count++; }
-
-  static void ResetCounters() {
-    g_copy_count = 0;
-    g_parse_count = 0;
-    g_delete_count = 0;
-  }
-
-  static int copy_count() { return g_copy_count; }
-  static int parse_count() { return g_parse_count; }
-  static int delete_count() { return g_delete_count; }
-
-  int value() const { return value_->value(); }
-  IntValue* value_ptr() const { return value_.get(); }
-  bool is_initialized() const { return !!value_; }
-  bool is_default() const { return is_default_; }
-
-  // TestValue uses the default traits struct with ProtoValuePtr<TestValue>.
-  // The following 4 functions are expected by the traits struct to exist
-  // in this class.
-  void CopyFrom(const TestValue& from) {
-    // Expected to always copy from an initialized instance
-    // to an uninitialized one.
-    // Not expected either value to be default.
-    ASSERT_FALSE(is_initialized());
-    ASSERT_FALSE(is_default());
-    ASSERT_TRUE(from.is_initialized());
-    ASSERT_FALSE(from.is_default());
-    value_.reset(new IntValue(from.value()));
-    g_copy_count++;
-  }
-
-  void Swap(TestValue* src) {
-    // Expected to always swap with an initialized instance.
-    // The current instance must always be an uninitialized one.
-    // Not expected either value to be default.
-    ASSERT_FALSE(is_initialized());
-    ASSERT_FALSE(is_default());
-    ASSERT_TRUE(src->is_initialized());
-    ASSERT_FALSE(src->is_default());
-    // Not exactly swap, but good enough for the test.
-    value_ = std::move(src->value_);
-  }
-
-  void ParseFromArray(const void* blob, int length) {
-    // Similarly to CopyFrom this is expected to be called on
-    // an uninitialized instance.
-    ASSERT_FALSE(is_initialized());
-    ASSERT_FALSE(is_default());
-    // The blob is an address of an integer
-    ASSERT_EQ(static_cast<int>(sizeof(int)), length);
-    value_.reset(new IntValue(*static_cast<const int*>(blob)));
-    g_parse_count++;
-  }
-
-  int ByteSize() const { return is_initialized() ? sizeof(int) : 0; }
-
-  static const TestValue& default_instance() {
-    static TestValue default_instance;
-    default_instance.is_default_ = true;
-    return default_instance;
-  }
-
- private:
-  static int g_copy_count;
-  static int g_parse_count;
-  static int g_delete_count;
-
-  std::unique_ptr<IntValue> value_;
-  bool is_default_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestValue);
-};
-
-// Static initializers.
-int TestValue::g_copy_count = 0;
-int TestValue::g_parse_count = 0;
-int TestValue::g_delete_count = 0;
-
-}  // namespace
-
-typedef ProtoValuePtr<TestValue> TestPtr;
-
-class ProtoValuePtrTest : public testing::Test {
- public:
-  void SetUp() override { TestValue::ResetCounters(); }
-
-  static bool WrappedValuesAreShared(const TestPtr& ptr1, const TestPtr& ptr2) {
-    const TestValue& wrapped_value_1 = ptr1.value();
-    const TestValue& wrapped_value_2 = ptr2.value();
-    // Compare addresses.
-    return &wrapped_value_1 == &wrapped_value_2;
-  }
-};
-
-TEST_F(ProtoValuePtrTest, ValueAssignment) {
-  // Basic assignment and default value.
-  TestValue t1(1);
-  {
-    TestPtr ptr1;
-    EXPECT_TRUE(ptr1->is_default());
-
-    ptr1.set_value(t1);
-    EXPECT_FALSE(ptr1->is_default());
-    EXPECT_EQ(1, ptr1->value());
-  }
-
-  EXPECT_EQ(1, TestValue::copy_count());
-  EXPECT_EQ(1, TestValue::delete_count());
-}
-
-TEST_F(ProtoValuePtrTest, ValueSwap) {
-  TestValue t2(2);
-  {
-    TestPtr ptr2;
-    EXPECT_TRUE(ptr2->is_default());
-
-    IntValue* inner_ptr = t2.value_ptr();
-
-    ptr2.swap_value(&t2);
-    EXPECT_FALSE(ptr2->is_default());
-    EXPECT_EQ(2, ptr2->value());
-    EXPECT_EQ(inner_ptr, ptr2->value_ptr());
-  }
-
-  EXPECT_EQ(0, TestValue::copy_count());
-  EXPECT_EQ(1, TestValue::delete_count());
-}
-
-TEST_F(ProtoValuePtrTest, SharingTest) {
-  // Sharing between two pointers.
-  TestValue empty;
-  TestValue t2(2);
-  TestValue t3(3);
-  {
-    TestPtr ptr2;
-    TestPtr ptr3;
-
-    EXPECT_TRUE(ptr2->is_default());
-    EXPECT_TRUE(ptr3->is_default());
-    EXPECT_EQ(0, TestValue::copy_count());
-    EXPECT_EQ(0, TestValue::delete_count());
-
-    ptr2.set_value(t2);
-    EXPECT_EQ(1, TestValue::copy_count());
-    EXPECT_EQ(0, TestValue::delete_count());
-
-    ptr3 = ptr2;
-    // Both |ptr2| and |ptr3| now share the same value "2".
-    // No additional copies expected.
-    EXPECT_EQ(1, TestValue::copy_count());
-    EXPECT_EQ(0, TestValue::delete_count());
-    EXPECT_FALSE(ptr3->is_default());
-    EXPECT_EQ(2, ptr3->value());
-    EXPECT_TRUE(WrappedValuesAreShared(ptr2, ptr3));
-
-    // Stop sharing - |ptr2| is "3" and |ptr3| is still "2".
-    ptr2.set_value(t3);
-    EXPECT_FALSE(WrappedValuesAreShared(ptr2, ptr3));
-    EXPECT_EQ(3, ptr2->value());
-    EXPECT_EQ(2, ptr3->value());
-    // No extra copies or deletions expected.
-    EXPECT_EQ(2, TestValue::copy_count());
-    EXPECT_EQ(0, TestValue::delete_count());
-
-    // |ptr3| still has the old value.
-    EXPECT_EQ(2, ptr3->value());
-
-    // Share again. Both values are "3".
-    ptr3 = ptr2;
-    EXPECT_EQ(3, ptr3->value());
-    // This should have resulted in deleting the wrapper for the value "2".
-    EXPECT_EQ(1, TestValue::delete_count());
-    // No extra copies expected.
-    EXPECT_EQ(2, TestValue::copy_count());
-
-    // Set default value to one of the pointers.
-    ptr2.set_value(empty);
-    EXPECT_TRUE(ptr2->is_default());
-    // The other one is still intact.
-    EXPECT_FALSE(ptr3->is_default());
-    EXPECT_EQ(3, ptr3->value());
-    // No extra copies or deletions expected.
-    EXPECT_EQ(1, TestValue::delete_count());
-    EXPECT_EQ(2, TestValue::copy_count());
-
-    // Copy the default value between the pointers.
-    ptr3 = ptr2;
-    EXPECT_TRUE(ptr3->is_default());
-    // The wrapper for "3" is now deleted.
-    EXPECT_EQ(2, TestValue::delete_count());
-  }
-
-  // No extra deletions expected upon leaving the scope.
-  EXPECT_EQ(2, TestValue::delete_count());
-}
-
-TEST_F(ProtoValuePtrTest, ParsingTest) {
-  int v1 = 21;
-
-  {
-    TestPtr ptr1;
-
-    ptr1.load(&v1, sizeof(int));
-
-    EXPECT_EQ(1, TestValue::parse_count());
-    EXPECT_EQ(0, TestValue::copy_count());
-
-    EXPECT_EQ(v1, ptr1->value());
-  }
-
-  EXPECT_EQ(1, TestValue::delete_count());
-}
-
-}  // namespace syncer