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Initial import of libdpf.

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Co-authored-by: Cursor <cursoragent@cursor.com>
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Ryan Henry 2026-09-24 14:08:32 -06:00
commit e4e666f459
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test/tests/incremental_json_test.cpp Normal file
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#include <gtest/gtest.h>
#include <cstdint>
#include <string>
#include <type_traits>
#include "dpf.hpp"
#include "dpf/json.hpp"
namespace
{
// Round-trip a comparison-only multi-level key through JSON and confirm the
// (public) comparison channel still reconstructs after deserialization.
TEST(IncrementalJsonTest, CmpKeyRoundTrips)
{
const uint32_t alpha = 0x00abcdefu;
const uint64_t yt = 42u;
auto [k0, k1] = dpf::make_dpf(alpha, dpf::lt(yt));
using KT = std::decay_t<decltype(k0)>;
static_assert(KT::is_multilevel, "cmp key must be multi-level");
ASSERT_EQ(KT::num_outputs, 0u);
const std::string s0 = dpf::json::to_json(k0);
const std::string s1 = dpf::json::to_json(k1);
auto r0 = dpf::json::from_json<KT>(s0);
auto r1 = dpf::json::from_json<KT>(s1);
const uint64_t mask = k0.cmp().mask;
EXPECT_EQ(r0.cmp().nbits, k0.cmp().nbits);
EXPECT_EQ(r0.cmp().mask, k0.cmp().mask);
EXPECT_EQ(r0.cw_last(), k0.cw_last());
EXPECT_EQ(r0.cmp_addend(), k0.cmp_addend());
auto recon_cmp = [&](uint32_t q) {
return dpf::reconstruct(dpf::eval_point(dpf::cmp, r0, q), dpf::eval_point(dpf::cmp, r1, q)) & mask;
};
EXPECT_EQ(recon_cmp(alpha - 1u), yt);
EXPECT_EQ(recon_cmp(0u), yt);
EXPECT_EQ(recon_cmp(alpha), 0u);
EXPECT_EQ(recon_cmp(alpha + 1u), 0u);
}
// A geq comparison (inverted path-sum) must also survive the round-trip.
TEST(IncrementalJsonTest, CmpGeqRoundTrips)
{
const uint32_t alpha = 100u;
const uint64_t yt = 5u, yf = 9u;
auto [k0, k1] = dpf::make_dpf(alpha, dpf::geq(yt, yf));
using KT = std::decay_t<decltype(k0)>;
auto r0 = dpf::json::from_json<KT>(dpf::json::to_json(k0));
auto r1 = dpf::json::from_json<KT>(dpf::json::to_json(k1));
const uint64_t mask = k0.cmp().mask;
auto r = [&](uint32_t q) {
return dpf::reconstruct(dpf::eval_point(dpf::cmp, r0, q), dpf::eval_point(dpf::cmp, r1, q)) & mask;
};
EXPECT_EQ(r(99u), yf);
EXPECT_EQ(r(100u), yt);
EXPECT_EQ(r(101u), yt);
}
} // namespace