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// 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 <limits>
#include <map>
#include <sstream>
#include <string>
#include <type_traits>
#include <unordered_map>
#include "content/common/id_type.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
namespace {
class Foo;
using FooId = IdType<Foo, int, 0>;
class Bar;
using BarId = IdType<Bar, int, 0>;
class AnotherIdMarker;
class DerivedId : public IdType<AnotherIdMarker, int, 0> {
public:
explicit DerivedId(int unsafe_value)
: IdType<AnotherIdMarker, int, 0>(unsafe_value) {}
};
} // namespace
TEST(IdType, DefaultValueIsInvalid) {
FooId foo_id;
EXPECT_TRUE(foo_id.is_null());
}
TEST(IdType, NormalValueIsValid) {
FooId foo_id = FooId::FromUnsafeValue(123);
EXPECT_FALSE(foo_id.is_null());
}
TEST(IdType, OutputStreamTest) {
FooId foo_id = FooId::FromUnsafeValue(123);
std::ostringstream ss;
ss << foo_id;
EXPECT_EQ("123", ss.str());
}
TEST(IdType, IdType32) {
IdType32<Foo> id;
EXPECT_EQ(0, id.GetUnsafeValue());
static_assert(sizeof(int32_t) == sizeof(id), "");
}
TEST(IdType, IdTypeU32) {
IdTypeU32<Foo> id;
EXPECT_EQ(0u, id.GetUnsafeValue());
static_assert(sizeof(uint32_t) == sizeof(id), "");
}
TEST(IdType, IdType64) {
IdType64<Foo> id;
EXPECT_EQ(0, id.GetUnsafeValue());
static_assert(sizeof(int64_t) == sizeof(id), "");
}
TEST(IdType, IdTypeU64) {
IdTypeU64<Foo> id;
EXPECT_EQ(0u, id.GetUnsafeValue());
static_assert(sizeof(uint64_t) == sizeof(id), "");
}
TEST(IdType, DerivedClasses) {
DerivedId derived_id(456);
std::ostringstream ss;
ss << derived_id;
EXPECT_EQ("456", ss.str());
std::map<DerivedId, std::string> ordered_map;
ordered_map[derived_id] = "blah";
EXPECT_EQ(ordered_map[derived_id], "blah");
std::unordered_map<DerivedId, std::string, DerivedId::Hasher> unordered_map;
unordered_map[derived_id] = "blah2";
EXPECT_EQ(unordered_map[derived_id], "blah2");
}
TEST(IdType, StaticAsserts) {
static_assert(!std::is_constructible<FooId, int>::value,
"Should be impossible to construct FooId from a raw integer.");
static_assert(!std::is_convertible<int, FooId>::value,
"Should be impossible to convert a raw integer into FooId.");
static_assert(!std::is_constructible<FooId, BarId>::value,
"Should be impossible to construct FooId from a BarId.");
static_assert(!std::is_convertible<BarId, FooId>::value,
"Should be impossible to convert a BarId into FooId.");
// The presence of a custom default constructor means that FooId is not a
// "trivial" class and therefore is not a POD type (unlike an int32_t).
// At the same time FooId has almost all of the properties of a POD type:
// - is "trivially copyable" (i.e. is memcpy-able),
// - has "standard layout" (i.e. interops with things expecting C layout).
// See http://stackoverflow.com/a/7189821 for more info about these
// concepts.
static_assert(std::is_standard_layout<FooId>::value,
"FooId should have standard layout. "
"See http://stackoverflow.com/a/7189821 for more info.");
static_assert(sizeof(FooId) == sizeof(int),
"FooId should be the same size as the raw integer it wraps.");
// TODO(lukasza): Enable these once <type_traits> supports all the standard
// C++11 equivalents (i.e. std::is_trivially_copyable instead of the
// non-standard std::has_trivial_copy_assign).
// static_assert(std::has_trivial_copy_constructor<FooId>::value,
// "FooId should have a trivial copy constructor.");
// static_assert(std::has_trivial_copy_assign<FooId>::value,
// "FooId should have a trivial copy assignment operator.");
// static_assert(std::has_trivial_destructor<FooId>::value,
// "FooId should have a trivial destructor.");
}
class IdTypeSpecificValueTest : public ::testing::TestWithParam<int> {
protected:
FooId test_id() { return FooId::FromUnsafeValue(GetParam()); }
FooId other_id() {
if (GetParam() != std::numeric_limits<int>::max())
return FooId::FromUnsafeValue(GetParam() + 1);
else
return FooId::FromUnsafeValue(std::numeric_limits<int>::min());
}
};
TEST_P(IdTypeSpecificValueTest, ComparisonToSelf) {
EXPECT_TRUE(test_id() == test_id());
EXPECT_FALSE(test_id() != test_id());
EXPECT_FALSE(test_id() < test_id());
}
TEST_P(IdTypeSpecificValueTest, ComparisonToOther) {
EXPECT_FALSE(test_id() == other_id());
EXPECT_TRUE(test_id() != other_id());
}
TEST_P(IdTypeSpecificValueTest, UnsafeValueRoundtrips) {
int original_value = GetParam();
FooId id = FooId::FromUnsafeValue(original_value);
int final_value = id.GetUnsafeValue();
EXPECT_EQ(original_value, final_value);
}
TEST_P(IdTypeSpecificValueTest, Copying) {
FooId original = test_id();
FooId copy_via_constructor(original);
EXPECT_EQ(original, copy_via_constructor);
FooId copy_via_assignment;
copy_via_assignment = original;
EXPECT_EQ(original, copy_via_assignment);
}
TEST_P(IdTypeSpecificValueTest, StdUnorderedMap) {
std::unordered_map<FooId, std::string, FooId::Hasher> map;
map[test_id()] = "test_id";
map[other_id()] = "other_id";
EXPECT_EQ(map[test_id()], "test_id");
EXPECT_EQ(map[other_id()], "other_id");
}
TEST_P(IdTypeSpecificValueTest, StdMap) {
std::map<FooId, std::string> map;
map[test_id()] = "test_id";
map[other_id()] = "other_id";
EXPECT_EQ(map[test_id()], "test_id");
EXPECT_EQ(map[other_id()], "other_id");
}
INSTANTIATE_TEST_CASE_P(,
IdTypeSpecificValueTest,
::testing::Values(std::numeric_limits<int>::min(),
-1,
0,
1,
123,
std::numeric_limits<int>::max()));
} // namespace content
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