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