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add more tests

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Théo DELRIEU 2016-12-15 00:06:37 +01:00 committed by Théo DELRIEU
parent 1c21c87e6f
commit d5ee5830ed
1 changed files with 199 additions and 50 deletions
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249
test/src/unit-udt.cpp
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@ -33,6 +33,8 @@ SOFTWARE.
#include "json.hpp"
using nlohmann::json;
namespace udt
{
enum class country
@ -80,17 +82,21 @@ namespace udt
// to_json methods
namespace udt
{
void to_json(nlohmann::json& j, age a)
// templates because of the custom_json tests (see below)
template <typename Json>
void to_json(Json& j, age a)
{
j = a.m_val;
}
void to_json(nlohmann::json& j, name const& n)
template <typename Json>
void to_json(Json& j, name const& n)
{
j = n.m_val;
}
void to_json(nlohmann::json& j, country c)
template <typename Json>
void to_json(Json& j, country c)
{
switch (c)
{
@ -106,10 +112,10 @@ namespace udt
}
}
void to_json(nlohmann::json& j, person const& p)
template <typename Json>
void to_json(Json& j, person const& p)
{
using nlohmann::json;
j = json{{"age", p.m_age}, {"name", p.m_name}, {"country", p.m_country}};
j = Json{{"age", p.m_age}, {"name", p.m_name}, {"country", p.m_country}};
}
void to_json(nlohmann::json& j, address const& a)
@ -119,13 +125,11 @@ namespace udt
void to_json(nlohmann::json& j, contact const& c)
{
using nlohmann::json;
j = json{{"person", c.m_person}, {"address", c.m_address}};
}
void to_json(nlohmann::json& j, contact_book const& cb)
{
using nlohmann::json;
j = json{{"name", cb.m_book_name}, {"contacts", cb.m_contacts}};
}
@ -166,17 +170,20 @@ namespace udt
// from_json methods
namespace udt
{
void from_json(nlohmann::json const& j, age &a)
template <typename Json>
void from_json(Json const& j, age &a)
{
a.m_val = j.get<int>();
}
void from_json(nlohmann::json const& j, name &n)
template <typename Json>
void from_json(Json const& j, name &n)
{
n.m_val = j.get<std::string>();
}
void from_json(nlohmann::json const &j, country &c)
template <typename Json>
void from_json(Json const &j, country &c)
{
const auto str = j.get<std::string>();
static const std::map<std::string, country> m = {
@ -189,7 +196,8 @@ namespace udt
c = it->second;
}
void from_json(nlohmann::json const& j, person &p)
template <typename Json>
void from_json(Json const& j, person &p)
{
p.m_age = j["age"].get<age>();
p.m_name = j["name"].get<name>();
@ -216,7 +224,6 @@ namespace udt
TEST_CASE("basic usage", "[udt]")
{
using nlohmann::json;
// a bit narcissic maybe :) ?
const udt::age a{23};
@ -273,34 +280,6 @@ TEST_CASE("basic usage", "[udt]")
namespace udt
{
template <typename T>
class optional_type
{
public:
optional_type() = default;
optional_type(T t) { _impl = std::make_shared<T>(std::move(t)); }
optional_type(std::nullptr_t) { _impl = nullptr; }
optional_type &operator=(std::nullptr_t)
{
_impl = nullptr;
return *this;
}
optional_type& operator=(T t)
{
_impl = std::make_shared<T>(std::move(t));
return *this;
}
explicit operator bool() const noexcept { return _impl != nullptr; }
T const &operator*() const noexcept { return *_impl; }
T &operator*() noexcept { return *_impl; }
private:
std::shared_ptr<T> _impl;
};
struct legacy_type
{
std::string number;
@ -310,9 +289,9 @@ struct legacy_type
namespace nlohmann
{
template <typename T>
struct adl_serializer<udt::optional_type<T>>
struct adl_serializer<std::shared_ptr<T>>
{
static void to_json(json& j, udt::optional_type<T> const& opt)
static void to_json(json& j, std::shared_ptr<T> const& opt)
{
if (opt)
j = *opt;
@ -320,12 +299,12 @@ struct adl_serializer<udt::optional_type<T>>
j = nullptr;
}
static void from_json(json const &j, udt::optional_type<T> &opt)
static void from_json(json const &j, std::shared_ptr<T> &opt)
{
if (j.is_null())
opt = nullptr;
else
opt = j.get<T>();
opt.reset(new T(j.get<T>()));
}
};
@ -346,18 +325,17 @@ struct adl_serializer<udt::legacy_type>
TEST_CASE("adl_serializer specialization", "[udt]")
{
using nlohmann::json;
SECTION("partial specialization")
{
SECTION("to_json")
{
udt::optional_type<udt::person> optPerson;
std::shared_ptr<udt::person> optPerson;
json j = optPerson;
CHECK(j.is_null());
optPerson = udt::person{{42}, {"John Doe"}};
optPerson.reset(new udt::person{{42}, {"John Doe"}});
j = optPerson;
CHECK_FALSE(j.is_null());
@ -369,12 +347,12 @@ TEST_CASE("adl_serializer specialization", "[udt]")
auto person = udt::person{{42}, {"John Doe"}};
json j = person;
auto optPerson = j.get<udt::optional_type<udt::person>>();
auto optPerson = j.get<std::shared_ptr<udt::person>>();
REQUIRE(optPerson);
CHECK(*optPerson == person);
j = nullptr;
optPerson = j.get<udt::optional_type<udt::person>>();
optPerson = j.get<std::shared_ptr<udt::person>>();
CHECK(!optPerson);
}
}
@ -397,3 +375,174 @@ TEST_CASE("adl_serializer specialization", "[udt]")
}
}
}
namespace nlohmann
{
// this might work in the future, not in the scope of this PR though
// we have to make this very clear in the doc
template <typename T>
struct adl_serializer<std::vector<T>>
{
static void to_json(json& j, std::vector<T> const& opt)
{
}
static void from_json(json const &j, std::vector<T> &opt)
{
}
};
}
TEST_CASE("current supported types are preferred over specializations", "[udt]")
{
json j = std::vector<int>{1, 2, 3};
auto f = j.get<std::vector<int>>();
CHECK((f == std::vector<int>{1, 2, 3}));
}
namespace nlohmann
{
template <typename T>
struct adl_serializer<std::unique_ptr<T>>
{
static void to_json(json& j, std::unique_ptr<T> const& opt)
{
if (opt)
j = *opt;
else
j = nullptr;
}
// this is the overload needed for non-copyable types,
// should we add a priority tag in the implementation to prefer this overload if it exists?
static std::unique_ptr<T> from_json(json const &j)
{
if (j.is_null())
return nullptr;
else
return std::unique_ptr<T>(new T(j.get<T>()));
}
};
}
TEST_CASE("Non-copyable types", "[udt]")
{
SECTION("to_json")
{
std::unique_ptr<udt::person> optPerson;
json j = optPerson;
CHECK(j.is_null());
optPerson.reset(new udt::person{{42}, {"John Doe"}});
j = optPerson;
CHECK_FALSE(j.is_null());
CHECK(j.get<udt::person>() == *optPerson);
}
SECTION("from_json")
{
auto person = udt::person{{42}, {"John Doe"}};
json j = person;
auto optPerson = j.get<std::unique_ptr<udt::person>>();
REQUIRE(optPerson);
CHECK(*optPerson == person);
j = nullptr;
optPerson = j.get<std::unique_ptr<udt::person>>();
CHECK(!optPerson);
}
}
// custom serializer
// advanced usage (I did not have a real use case in mind)
template <typename T, typename = typename std::enable_if<std::is_pod<T>::value>::type>
struct pod_serializer
{
// I could forward-declare this struct, and add a basic_json alias
template <typename Json>
static void from_json(Json const& j , T& t)
{
auto value = j.template get<std::uint64_t>();
auto bytes = static_cast<char*>(static_cast<void*>(&value));
std::memcpy(&t, bytes, sizeof(value));
}
template <typename Json>
static void to_json(Json& j, T const& t)
{
auto bytes = static_cast<char const*>(static_cast<void const*>(&t));
std::uint64_t value = bytes[0];
for (auto i = 1; i < 8; ++i)
value |= bytes[i] << 8 * i;
j = value;
}
};
namespace udt
{
struct small_pod
{
int begin;
char middle;
short end;
};
bool operator==(small_pod lhs, small_pod rhs)
{
return std::tie(lhs.begin, lhs.middle, lhs.end) ==
std::tie(lhs.begin, lhs.middle, lhs.end);
}
}
TEST_CASE("custom serializer for pods", "[udt]")
{
using custom_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, double, std::allocator, pod_serializer>;
auto p = udt::small_pod{42, '/', 42};
custom_json j = p;
auto p2 = j.get<udt::small_pod>();
CHECK(p == p2);
}
template <typename T, typename>
struct another_adl_serializer;
using custom_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, double, std::allocator, another_adl_serializer>;
template <typename T, typename>
struct another_adl_serializer
{
static void from_json(custom_json const& j , T& t)
{
using nlohmann::from_json;
from_json(j, t);
}
static void to_json(custom_json& j , T const& t)
{
using nlohmann::to_json;
to_json(j, t);
}
};
TEST_CASE("custom serializer that does adl by default", "[udt]")
{
using json = nlohmann::json;
auto me = udt::person{23, "theo", udt::country::france};
json j = me;
custom_json cj = me;
CHECK(j.dump() == cj.dump());
CHECK(me == j.get<udt::person>());
CHECK(me == cj.get<udt::person>());
}