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| -rw-r--r-- | test/C_API.cpp | 442 |
1 files changed, 442 insertions, 0 deletions
diff --git a/test/C_API.cpp b/test/C_API.cpp new file mode 100644 index 0000000..f186374 --- /dev/null +++ b/test/C_API.cpp @@ -0,0 +1,442 @@ +#include <catch2/catch_test_macros.hpp> + +#include "RNT_C_API.h" + +#include <cstring> +#include <string> + +// --------------------------------------------------------------------------- +// End-to-end C API tests covering step 2 (Branch hash-pointer), step 3+4 +// (copy-on-write writes and resolver wiring through rnt_open_handle), and +// step 5 (session lifecycle and overrides). +// +// The C API holds a single process-global runtime; rnt_init is idempotent. +// Each test uses unique branch and session identifiers so state from one +// test does not affect another. +// --------------------------------------------------------------------------- + +namespace +{ + struct InitGuard { + InitGuard() { REQUIRE(rnt_init("memory", nullptr) == 0); } + }; + + std::string take_string(char* p) + { + std::string s = p ? p : ""; + rnt_free_string(p); + return s; + } +} + +// --------------------------------------------------------------------------- +// Step 2 — Branch hash-pointer model +// --------------------------------------------------------------------------- + +TEST_CASE("rnt_register_branch with empty target creates an unborn branch", + "[step2][capi][branch]") +{ + InitGuard _; + const char* path = "/system/branches/test_step2_unborn"; + REQUIRE(rnt_register_branch(path, "") == 0); + + rnt_handle_t h = rnt_open_handle(path, nullptr); + REQUIRE(h != nullptr); + + char* target = nullptr; + REQUIRE(rnt_branch_target(h, &target) == 0); + REQUIRE(take_string(target) == ""); + + REQUIRE(rnt_close_handle(h) == 0); +} + +TEST_CASE("rnt_register_branch rejects an unregistered target hash", + "[step2][capi][branch]") +{ + InitGuard _; + REQUIRE(rnt_register_branch("/system/branches/test_step2_bad_init", + "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff") + != 0); +} + +TEST_CASE("rnt_branch_advance rejects an unregistered target hash", + "[step2][capi][branch]") +{ + InitGuard _; + const char* bpath = "/system/branches/test_step2_bad_advance"; + REQUIRE(rnt_register_branch(bpath, "") == 0); + + REQUIRE(rnt_branch_advance( + bpath, + "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff") != 0); + + // Target unchanged. + rnt_handle_t h = rnt_open_handle(bpath, nullptr); + REQUIRE(h != nullptr); + char* target = nullptr; + REQUIRE(rnt_branch_target(h, &target) == 0); + REQUIRE(take_string(target) == ""); + rnt_close_handle(h); +} + +TEST_CASE("Writing a tuple advances the branch to a new snapshot", + "[step2][step3][capi][branch]") +{ + InitGuard _; + const char* bpath = "/system/branches/test_step2_advance"; + const char* rpath = "/system/branches/test_step2_advance/multigroups/public/relations/items"; + REQUIRE(rnt_register_branch(bpath, "") == 0); + REQUIRE(rnt_register_relation(rpath) == 0); + + // After register_relation, the branch is bound to the first snapshot. + rnt_handle_t h = rnt_open_handle(bpath, nullptr); + REQUIRE(h != nullptr); + char* first = nullptr; + REQUIRE(rnt_branch_target(h, &first) == 0); + const std::string first_hash = take_string(first); + REQUIRE(first_hash.size() == 64); + rnt_close_handle(h); + + // A tuple write advances the branch again. + char* tuple_hash = nullptr; + REQUIRE(rnt_link_tuple(rpath, "id=1\n", &tuple_hash) == 0); + rnt_free_string(tuple_hash); + + h = rnt_open_handle(bpath, nullptr); + REQUIRE(h != nullptr); + char* second = nullptr; + REQUIRE(rnt_branch_target(h, &second) == 0); + const std::string second_hash = take_string(second); + rnt_close_handle(h); + + REQUIRE(second_hash.size() == 64); + REQUIRE(second_hash != first_hash); +} + +// --------------------------------------------------------------------------- +// Step 3+4 — Copy-on-write writes and resolver wiring +// --------------------------------------------------------------------------- + +TEST_CASE("link_tuple commits a new snapshot and relation_root reflects it", + "[step3][capi][cow]") +{ + InitGuard _; + const char* bpath = "/system/branches/test_step3_link"; + const char* rpath = "/system/branches/test_step3_link/multigroups/public/relations/items"; + REQUIRE(rnt_register_branch(bpath, "") == 0); + REQUIRE(rnt_register_relation(rpath) == 0); + + // Empty relation: root is "". + char* root = nullptr; + REQUIRE(rnt_relation_root(rpath, &root) == 0); + REQUIRE(take_string(root) == ""); + + char* tuple_hash = nullptr; + REQUIRE(rnt_link_tuple(rpath, "id=1\nname=alpha\n", &tuple_hash) == 0); + REQUIRE(tuple_hash != nullptr); + rnt_free_string(tuple_hash); + + REQUIRE(rnt_relation_root(rpath, &root) == 0); + const std::string new_root = take_string(root); + REQUIRE(new_root.size() == 64); // a real Merkle root now +} + +TEST_CASE("unlink_tuple and clear_relation walk back through new snapshots", + "[step3][capi][cow]") +{ + InitGuard _; + const char* bpath = "/system/branches/test_step3_unlink"; + const char* rpath = "/system/branches/test_step3_unlink/multigroups/public/relations/items"; + REQUIRE(rnt_register_branch(bpath, "") == 0); + REQUIRE(rnt_register_relation(rpath) == 0); + + char* th = nullptr; + REQUIRE(rnt_link_tuple(rpath, "id=1\n", &th) == 0); + const std::string tuple_hash = take_string(th); + + char* root = nullptr; + REQUIRE(rnt_relation_root(rpath, &root) == 0); + REQUIRE(take_string(root) != ""); + + REQUIRE(rnt_unlink_tuple(rpath, tuple_hash.c_str()) == 0); + REQUIRE(rnt_relation_root(rpath, &root) == 0); + REQUIRE(take_string(root) == ""); + + // After re-link and clear, root is empty again. + REQUIRE(rnt_link_tuple(rpath, "id=2\n", &th) == 0); + rnt_free_string(th); + REQUIRE(rnt_clear_relation(rpath) == 0); + REQUIRE(rnt_relation_root(rpath, &root) == 0); + REQUIRE(take_string(root) == ""); +} + +TEST_CASE("rnt_open_handle resolves branch-relative paths to snapshot relations", + "[step4][capi][resolver]") +{ + InitGuard _; + const char* bpath = "/system/branches/test_step4_resolve"; + const char* rpath = "/system/branches/test_step4_resolve/multigroups/public/relations/items"; + REQUIRE(rnt_register_branch(bpath, "") == 0); + REQUIRE(rnt_register_relation(rpath) == 0); + + char* tuple_hash = nullptr; + REQUIRE(rnt_link_tuple(rpath, "id=1\n", &tuple_hash) == 0); + rnt_free_string(tuple_hash); + + // Opening the branch-relative path resolves to the snapshot-bound entry, + // and a cursor reads the tuple just written. + rnt_handle_t h = rnt_open_handle(rpath, nullptr); + REQUIRE(h != nullptr); + rnt_cursor_t c = rnt_cursor_open(h); + REQUIRE(c != nullptr); + + char* row = nullptr; + REQUIRE(rnt_cursor_next(c, &row) == 1); + REQUIRE(row != nullptr); + rnt_free_string(row); + + // Exhausted on the next call. + REQUIRE(rnt_cursor_next(c, &row) == 0); + REQUIRE(row == nullptr); + + rnt_cursor_close(c); + rnt_close_handle(h); +} + +TEST_CASE("Reading an unborn branch's relation fails cleanly", + "[step4][capi][resolver]") +{ + InitGuard _; + const char* bpath = "/system/branches/test_step4_unborn"; + REQUIRE(rnt_register_branch(bpath, "") == 0); + + // No relation registered: relation_root miss returns nonzero. + char* root = nullptr; + REQUIRE(rnt_relation_root( + "/system/branches/test_step4_unborn/multigroups/public/relations/missing", &root) != 0); +} + +// --------------------------------------------------------------------------- +// Step 5 — Session lifecycle and overrides +// --------------------------------------------------------------------------- + +TEST_CASE("Each rnt_session_open returns a distinct 64-char hex hash", + "[step5][capi][session]") +{ + InitGuard _; + char* a = nullptr; + char* b = nullptr; + REQUIRE(rnt_session_open(nullptr, &a) == 0); + REQUIRE(rnt_session_open(nullptr, &b) == 0); + const std::string ha = take_string(a); + const std::string hb = take_string(b); + REQUIRE(ha.size() == 64); + REQUIRE(hb.size() == 64); + REQUIRE(ha != hb); + + REQUIRE(rnt_session_close(ha.c_str()) == 0); + REQUIRE(rnt_session_close(hb.c_str()) == 0); +} + +TEST_CASE("rnt_session_close on an unknown hash fails", + "[step5][capi][session]") +{ + InitGuard _; + REQUIRE(rnt_session_close( + "0000000000000000000000000000000000000000000000000000000000000000") != 0); +} + +TEST_CASE("Session override redirects branch-relative reads to a different snapshot", + "[step5][capi][session][resolver]") +{ + InitGuard _; + const char* bpath = "/system/branches/test_step5_override"; + const char* rpath = "/system/branches/test_step5_override/multigroups/public/relations/items"; + REQUIRE(rnt_register_branch(bpath, "") == 0); + REQUIRE(rnt_register_relation(rpath) == 0); + + // Snapshot S1: one tuple. + char* th = nullptr; + REQUIRE(rnt_link_tuple(rpath, "id=1\n", &th) == 0); + rnt_free_string(th); + + // Capture S1's hash and pin it via a session override before the next + // commit — without the override the next link_tuple would cascade-collect + // S1 as soon as the branch advances away from it. + rnt_handle_t bh = rnt_open_handle(bpath, nullptr); + REQUIRE(bh != nullptr); + char* target = nullptr; + REQUIRE(rnt_branch_target(bh, &target) == 0); + const std::string s1 = take_string(target); + rnt_close_handle(bh); + + char* sess = nullptr; + REQUIRE(rnt_session_open(nullptr, &sess) == 0); + const std::string sid = take_string(sess); + REQUIRE(rnt_session_set_branch(sid.c_str(), + "test_step5_override", + s1.c_str()) == 0); + + // Advance the branch to S2 — global HEAD moves on; the session override + // keeps S1 resident. + REQUIRE(rnt_link_tuple(rpath, "id=2\n", &th) == 0); + rnt_free_string(th); + + // Session view: still S1 (one tuple). + const std::string spath = + "/system/sessions/" + sid + + "/branches/test_step5_override/multigroups/public/relations/items"; + + rnt_handle_t h_session = rnt_open_handle(spath.c_str(), nullptr); + REQUIRE(h_session != nullptr); + rnt_cursor_t c_session = rnt_cursor_open(h_session); + REQUIRE(c_session != nullptr); + + int rows_under_session = 0; + char* row = nullptr; + while (rnt_cursor_next(c_session, &row) == 1) + { + ++rows_under_session; + rnt_free_string(row); + } + REQUIRE(rows_under_session == 1); + + rnt_cursor_close(c_session); + rnt_close_handle(h_session); + + // Global view sees both tuples. + rnt_handle_t h_global = rnt_open_handle(rpath, nullptr); + REQUIRE(h_global != nullptr); + rnt_cursor_t c_global = rnt_cursor_open(h_global); + REQUIRE(c_global != nullptr); + int rows_global = 0; + while (rnt_cursor_next(c_global, &row) == 1) { ++rows_global; rnt_free_string(row); } + REQUIRE(rows_global == 2); + rnt_cursor_close(c_global); + rnt_close_handle(h_global); + + REQUIRE(rnt_session_close(sid.c_str()) == 0); +} + +TEST_CASE("Clearing a session override falls back to the global branch HEAD", + "[step5][capi][session][resolver]") +{ + InitGuard _; + const char* bpath = "/system/branches/test_step5_clear"; + const char* rpath = "/system/branches/test_step5_clear/multigroups/public/relations/items"; + REQUIRE(rnt_register_branch(bpath, "") == 0); + REQUIRE(rnt_register_relation(rpath) == 0); + + char* th = nullptr; + REQUIRE(rnt_link_tuple(rpath, "id=1\n", &th) == 0); + rnt_free_string(th); + rnt_handle_t bh = rnt_open_handle(bpath, nullptr); + REQUIRE(bh != nullptr); + char* target = nullptr; + REQUIRE(rnt_branch_target(bh, &target) == 0); + const std::string s1 = take_string(target); + rnt_close_handle(bh); + + // Same pattern as above: install the override on S1 before advancing. + char* sess = nullptr; + REQUIRE(rnt_session_open(nullptr, &sess) == 0); + const std::string sid = take_string(sess); + REQUIRE(rnt_session_set_branch(sid.c_str(), "test_step5_clear", s1.c_str()) == 0); + + REQUIRE(rnt_link_tuple(rpath, "id=2\n", &th) == 0); + rnt_free_string(th); + + // Clear the override. + REQUIRE(rnt_session_set_branch(sid.c_str(), "test_step5_clear", "") == 0); + + // Now the session sees the global view (two tuples). + const std::string spath = + "/system/sessions/" + sid + + "/branches/test_step5_clear/multigroups/public/relations/items"; + rnt_handle_t h = rnt_open_handle(spath.c_str(), nullptr); + REQUIRE(h != nullptr); + rnt_cursor_t c = rnt_cursor_open(h); + REQUIRE(c != nullptr); + int rows = 0; + char* row = nullptr; + while (rnt_cursor_next(c, &row) == 1) { ++rows; rnt_free_string(row); } + REQUIRE(rows == 2); + rnt_cursor_close(c); + rnt_close_handle(h); + + REQUIRE(rnt_session_close(sid.c_str()) == 0); +} + +TEST_CASE("rnt_session_set_branch rejects an unregistered snapshot", + "[step5][capi][session]") +{ + InitGuard _; + char* sess = nullptr; + REQUIRE(rnt_session_open(nullptr, &sess) == 0); + const std::string sid = take_string(sess); + + REQUIRE(rnt_session_set_branch( + sid.c_str(), + "anything", + "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff") != 0); + + REQUIRE(rnt_session_close(sid.c_str()) == 0); +} + +// --------------------------------------------------------------------------- +// Multi-mg-per-branch — sibling multigroups under one branch evolve +// independently. Inserting into one mg must not perturb the other's hash +// or its enumerable relation set. +// --------------------------------------------------------------------------- + +TEST_CASE("Two multigroups under one branch advance independently", + "[capi][multi-mg]") +{ + InitGuard _; + const std::string bpath = "/system/branches/test_multi_mg"; + REQUIRE(rnt_register_branch(bpath.c_str(), "") == 0); + + // Register one relation in each of two distinct multigroups. + REQUIRE(rnt_register_relation( + (bpath + "/multigroups/warehouse/relations/orders").c_str()) == 0); + REQUIRE(rnt_register_relation( + (bpath + "/multigroups/audit/relations/events").c_str()) == 0); + + char* mgs_raw = nullptr; + REQUIRE(rnt_list_branch_multigroups(bpath.c_str(), &mgs_raw) == 0); + const std::string mgs = take_string(mgs_raw); + REQUIRE(mgs.find("warehouse\t") != std::string::npos); + REQUIRE(mgs.find("audit\t") != std::string::npos); + + // Insert into warehouse; record audit's root before/after. + char* audit_before = nullptr; + REQUIRE(rnt_list_relations( + (bpath + "/multigroups/audit").c_str(), &audit_before) == 0); + const std::string audit_before_s = take_string(audit_before); + + char* th = nullptr; + REQUIRE(rnt_link_tuple((bpath + "/multigroups/warehouse/relations/orders").c_str(), + "id=1\n", &th) == 0); + rnt_free_string(th); + + char* audit_after = nullptr; + REQUIRE(rnt_list_relations( + (bpath + "/multigroups/audit").c_str(), &audit_after) == 0); + const std::string audit_after_s = take_string(audit_after); + + // audit's relation set is byte-identical: the warehouse-side mutation + // touched only the warehouse subtree at the multigroup level. + REQUIRE(audit_before_s == audit_after_s); + + // warehouse/orders is now non-empty. + char* root = nullptr; + REQUIRE(rnt_relation_root( + (bpath + "/multigroups/warehouse/relations/orders").c_str(), &root) == 0); + REQUIRE(!take_string(root).empty()); + + // audit/events still empty. + char* root2 = nullptr; + REQUIRE(rnt_relation_root( + (bpath + "/multigroups/audit/relations/events").c_str(), &root2) == 0); + REQUIRE(take_string(root2).empty()); +} |