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https://github.com/NixOS/nix
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91b6833686
Today, with the tests inside a `tests` intermingled with the
corresponding library's source code, we have a few problems:
- We have to be careful that wildcards don't end up with tests being
built as part of Nix proper, or test headers being installed as part
of Nix proper.
- Tests in libraries but not executables is not right:
- It means each executable runs the previous unit tests again, because
it needs the libraries.
- It doesn't work right on Windows, which doesn't want you to load a
DLL just for the side global variable . It could be made to work
with the dlopen equivalent, but that's gross!
This reorg solves these problems.
There is a remaining problem which is that sibbling headers (like
`hash.hh` the test header vs `hash.hh` the main `libnixutil` header) end
up shadowing each other. This PR doesn't solve that. That is left as
future work for a future PR.
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
#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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