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#include <vector>
#include <optional>
#include <gtest/gtest.h>
#include "json-utils.hh"
namespace nix {
/* Test `to_json` and `from_json` with `std::optional` types.
* We are specifically interested in whether we can _nest_ optionals in STL
* containers so we that we can leverage existing adl_serializer templates. */
TEST(to_json, optionalInt) {
std::optional<int> val = std::make_optional(420);
ASSERT_EQ(nlohmann::json(val), nlohmann::json(420));
val = std::nullopt;
ASSERT_EQ(nlohmann::json(val), nlohmann::json(nullptr));
}
TEST(to_json, vectorOfOptionalInts) {
std::vector<std::optional<int>> vals = {
std::make_optional(420),
std::nullopt,
};
ASSERT_EQ(nlohmann::json(vals), nlohmann::json::parse("[420,null]"));
}
TEST(to_json, optionalVectorOfInts) {
std::optional<std::vector<int>> val = std::make_optional(std::vector<int> {
-420,
420,
});
ASSERT_EQ(nlohmann::json(val), nlohmann::json::parse("[-420,420]"));
val = std::nullopt;
ASSERT_EQ(nlohmann::json(val), nlohmann::json(nullptr));
}
TEST(from_json, optionalInt) {
nlohmann::json json = 420;
std::optional<int> val = json;
ASSERT_TRUE(val.has_value());
ASSERT_EQ(*val, 420);
json = nullptr;
json.get_to(val);
ASSERT_FALSE(val.has_value());
}
TEST(from_json, vectorOfOptionalInts) {
nlohmann::json json = { 420, nullptr };
std::vector<std::optional<int>> vals = json;
ASSERT_EQ(vals.size(), 2);
ASSERT_TRUE(vals.at(0).has_value());
ASSERT_EQ(*vals.at(0), 420);
ASSERT_FALSE(vals.at(1).has_value());
}
} /* namespace nix */
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