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Diffstat (limited to 'tests/test_term_bank.cc')
| -rw-r--r-- | tests/test_term_bank.cc | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/tests/test_term_bank.cc b/tests/test_term_bank.cc index b62ffd0..63acc34 100644 --- a/tests/test_term_bank.cc +++ b/tests/test_term_bank.cc @@ -16,4 +16,320 @@ * along with this program. If not, see <https://www.gnu.org/licenses/>. */ +#include <gtest/gtest.h> +#include "atp/core/clause.h" +#include "atp/core/clause_store.h" +#include "atp/core/literal.h" +#include "atp/core/symbol_table.h" +#include "atp/core/term.h" +#include "atp/core/term_bank.h" +#include "atp/core/types.h" + +namespace atp { +namespace { + +// ═══════════════════════════════════════════════════════════════════════════ +// SymbolTable Tests +// ═══════════════════════════════════════════════════════════════════════════ + +TEST(SymbolTableTest, InternReturnsConsistentId) { + SymbolTable st; + SymbolId id1 = st.intern("foo", SymbolKind::kFunction, 2); + SymbolId id2 = st.intern("foo", SymbolKind::kFunction, 2); + EXPECT_EQ(id1, id2); +} + +TEST(SymbolTableTest, DifferentNamesGetDifferentIds) { + SymbolTable st; + SymbolId a = st.intern("a", SymbolKind::kConstant); + SymbolId b = st.intern("b", SymbolKind::kConstant); + EXPECT_NE(a, b); +} + +TEST(SymbolTableTest, GetNameRoundTrips) { + SymbolTable st; + SymbolId id = st.intern("hello", SymbolKind::kFunction, 1); + EXPECT_EQ(st.getName(id), "hello"); +} + +TEST(SymbolTableTest, GetInfoPreservesMetadata) { + SymbolTable st; + SymbolId id = st.intern("P", SymbolKind::kPredicate, 3, 42); + const SymbolInfo& info = st.getInfo(id); + EXPECT_EQ(info.name, "P"); + EXPECT_EQ(info.kind, SymbolKind::kPredicate); + EXPECT_EQ(info.arity, 3); + EXPECT_EQ(info.sort, 42); +} + +TEST(SymbolTableTest, IsVariableDetectsKind) { + SymbolTable st; + SymbolId var = st.intern("X", SymbolKind::kVariable); + SymbolId con = st.intern("a", SymbolKind::kConstant); + SymbolId fun = st.intern("f", SymbolKind::kFunction, 1); + EXPECT_TRUE(st.isVariable(var)); + EXPECT_FALSE(st.isVariable(con)); + EXPECT_FALSE(st.isVariable(fun)); +} + +TEST(SymbolTableTest, MismatchKindThrows) { + SymbolTable st; + st.intern("x", SymbolKind::kConstant); + EXPECT_THROW(st.intern("x", SymbolKind::kVariable), std::runtime_error); +} + +TEST(SymbolTableTest, MismatchArityThrows) { + SymbolTable st; + st.intern("f", SymbolKind::kFunction, 1); + EXPECT_THROW(st.intern("f", SymbolKind::kFunction, 2), std::runtime_error); +} + +TEST(SymbolTableTest, SizeTracksInternedSymbols) { + SymbolTable st; + EXPECT_EQ(st.size(), 0); + st.intern("a", SymbolKind::kConstant); + EXPECT_EQ(st.size(), 1); + st.intern("b", SymbolKind::kConstant); + EXPECT_EQ(st.size(), 2); + st.intern("a", SymbolKind::kConstant); // duplicate + EXPECT_EQ(st.size(), 2); +} + +// ═══════════════════════════════════════════════════════════════════════════ +// TermBank Tests +// ═══════════════════════════════════════════════════════════════════════════ + +class TermBankTest : public ::testing::Test { + protected: + SymbolTable symbols; + TermBank bank{symbols}; + + SymbolId sym_a, sym_b, sym_f, sym_g, sym_X, sym_Y; + + void SetUp() override { + sym_a = symbols.intern("a", SymbolKind::kConstant); + sym_b = symbols.intern("b", SymbolKind::kConstant); + sym_f = symbols.intern("f", SymbolKind::kFunction, 1); + sym_g = symbols.intern("g", SymbolKind::kFunction, 2); + sym_X = symbols.intern("X", SymbolKind::kVariable); + sym_Y = symbols.intern("Y", SymbolKind::kVariable); + } +}; + +TEST_F(TermBankTest, HashConsingReturnsSameId) { + TermId a1 = bank.makeTerm(sym_a, {}); + TermId a2 = bank.makeTerm(sym_a, {}); + EXPECT_EQ(a1, a2) << "Hash consing failed: same term got different IDs"; +} + +TEST_F(TermBankTest, DifferentTermsGetDifferentIds) { + TermId a = bank.makeTerm(sym_a, {}); + TermId b = bank.makeTerm(sym_b, {}); + EXPECT_NE(a, b); +} + +TEST_F(TermBankTest, CompoundTermHashConsing) { + TermId a = bank.makeTerm(sym_a, {}); + TermId b = bank.makeTerm(sym_b, {}); + // f(a) + TermId fa1 = bank.makeTerm(sym_f, {{a}}); + TermId fa2 = bank.makeTerm(sym_f, {{a}}); + EXPECT_EQ(fa1, fa2); + // f(b) != f(a) + TermId fb = bank.makeTerm(sym_f, {{b}}); + EXPECT_NE(fa1, fb); +} + +TEST_F(TermBankTest, NestedTermHashConsing) { + TermId a = bank.makeTerm(sym_a, {}); + TermId fa = bank.makeTerm(sym_f, {{a}}); + // g(f(a), a) + TermId gfa_a_1 = bank.makeTerm(sym_g, {{fa, a}}); + TermId gfa_a_2 = bank.makeTerm(sym_g, {{fa, a}}); + EXPECT_EQ(gfa_a_1, gfa_a_2); +} + +TEST_F(TermBankTest, GetTermReturnsCorrectSymbol) { + TermId a = bank.makeTerm(sym_a, {}); + const Term& t = bank.getTerm(a); + EXPECT_EQ(t.symbol_id, sym_a); + EXPECT_EQ(t.arity(), 0); +} + +TEST_F(TermBankTest, GetTermReturnsCorrectArgs) { + TermId a = bank.makeTerm(sym_a, {}); + TermId b = bank.makeTerm(sym_b, {}); + TermId gab = bank.makeTerm(sym_g, {{a, b}}); + + const Term& t = bank.getTerm(gab); + EXPECT_EQ(t.symbol_id, sym_g); + EXPECT_EQ(t.arity(), 2); + ASSERT_EQ(t.args.size(), 2); + EXPECT_EQ(t.args[0], a); + EXPECT_EQ(t.args[1], b); +} + +TEST_F(TermBankTest, MakeVarCreatesZeroArityTerm) { + TermId x = bank.makeVar(sym_X); + const Term& t = bank.getTerm(x); + EXPECT_EQ(t.symbol_id, sym_X); + EXPECT_EQ(t.arity(), 0); + EXPECT_TRUE(t.args.empty()); +} + +TEST_F(TermBankTest, IsVariableDistinguishesFromConstants) { + TermId x = bank.makeVar(sym_X); + TermId a = bank.makeTerm(sym_a, {}); + + EXPECT_TRUE(bank.isVariable(x)) << "Variable should be detected as variable"; + EXPECT_FALSE(bank.isVariable(a)) << "Constant should NOT be detected as variable"; +} + +TEST_F(TermBankTest, VariableHashConsing) { + TermId x1 = bank.makeVar(sym_X); + TermId x2 = bank.makeVar(sym_X); + EXPECT_EQ(x1, x2); + + TermId y = bank.makeVar(sym_Y); + EXPECT_NE(x1, y); +} + +TEST_F(TermBankTest, SizeTracksUniqueTerms) { + EXPECT_EQ(bank.size(), 0); + TermId a = bank.makeTerm(sym_a, {}); + EXPECT_EQ(bank.size(), 1); + bank.makeTerm(sym_a, {}); // duplicate + EXPECT_EQ(bank.size(), 1); + bank.makeTerm(sym_b, {}); + EXPECT_EQ(bank.size(), 2); + bank.makeTerm(sym_f, {{a}}); + EXPECT_EQ(bank.size(), 3); +} + +TEST_F(TermBankTest, CompoundTermWithVariableArgs) { + // f(X) — a function applied to a variable + TermId x = bank.makeVar(sym_X); + TermId fx = bank.makeTerm(sym_f, {{x}}); + + const Term& t = bank.getTerm(fx); + EXPECT_EQ(t.symbol_id, sym_f); + EXPECT_EQ(t.arity(), 1); + EXPECT_EQ(t.args[0], x); + + EXPECT_FALSE(bank.isVariable(fx)); + EXPECT_TRUE(bank.isVariable(x)); +} + +// ═══════════════════════════════════════════════════════════════════════════ +// ClauseStore Tests +// ═══════════════════════════════════════════════════════════════════════════ + +TEST(ClauseStoreTest, AddAndRetrieve) { + ClauseStore store; + Clause c; + c.literals.push_back(Literal{.atom = 0, .is_positive = true}); + c.literals.push_back(Literal{.atom = 1, .is_positive = false}); + + ClauseId id = store.addClause(std::move(c)); + EXPECT_EQ(id, 0); + + const Clause& retrieved = store.getClause(id); + EXPECT_EQ(retrieved.id, id); + EXPECT_EQ(retrieved.literals.size(), 2); + EXPECT_EQ(retrieved.literals[0].atom, 0); + EXPECT_TRUE(retrieved.literals[0].is_positive); + EXPECT_EQ(retrieved.literals[1].atom, 1); + EXPECT_FALSE(retrieved.literals[1].is_positive); +} + +TEST(ClauseStoreTest, AssignsSequentialIds) { + ClauseStore store; + ClauseId id0 = store.addClause(Clause{}); + ClauseId id1 = store.addClause(Clause{}); + ClauseId id2 = store.addClause(Clause{}); + EXPECT_EQ(id0, 0); + EXPECT_EQ(id1, 1); + EXPECT_EQ(id2, 2); + EXPECT_EQ(store.size(), 3); +} + +TEST(ClauseStoreTest, StampsClauseWithId) { + ClauseStore store; + Clause c; + c.id = kInvalidId; // unset + ClauseId id = store.addClause(std::move(c)); + EXPECT_EQ(store.getClause(id).id, id); +} + +TEST(ClauseStoreTest, MutableAccess) { + ClauseStore store; + Clause c; + c.depth = 0; + ClauseId id = store.addClause(std::move(c)); + + store.getMutableClause(id).depth = 42; + EXPECT_EQ(store.getClause(id).depth, 42); +} + +TEST(ClauseStoreTest, ForEachVisitsAll) { + ClauseStore store; + store.addClause(Clause{}); + store.addClause(Clause{}); + store.addClause(Clause{}); + + size_t count = 0; + store.forEach([&count](const Clause&) { count++; }); + EXPECT_EQ(count, 3); +} + +TEST(ClauseStoreTest, EmptyClauseDetection) { + Clause c; + EXPECT_TRUE(c.isEmpty()); + c.literals.push_back(Literal{.atom = 0, .is_positive = true}); + EXPECT_FALSE(c.isEmpty()); + EXPECT_EQ(c.size(), 1); +} + +TEST(ClauseStoreTest, ProvenancePreserved) { + ClauseStore store; + Clause c; + c.rule = InferenceRule::kResolution; + c.parent1 = 3; + c.parent2 = 7; + c.depth = 5; + + ClauseId id = store.addClause(std::move(c)); + const Clause& retrieved = store.getClause(id); + EXPECT_EQ(retrieved.rule, InferenceRule::kResolution); + EXPECT_EQ(retrieved.parent1, 3); + EXPECT_EQ(retrieved.parent2, 7); + EXPECT_EQ(retrieved.depth, 5); +} + +// ═══════════════════════════════════════════════════════════════════════════ +// Literal Tests +// ═══════════════════════════════════════════════════════════════════════════ + +TEST(LiteralTest, Complement) { + Literal pos{.atom = 42, .is_positive = true}; + Literal neg = pos.complement(); + EXPECT_EQ(neg.atom, 42); + EXPECT_FALSE(neg.is_positive); + + Literal back = neg.complement(); + EXPECT_EQ(back, pos); +} + +TEST(LiteralTest, Equality) { + Literal a{.atom = 1, .is_positive = true}; + Literal b{.atom = 1, .is_positive = true}; + Literal c{.atom = 1, .is_positive = false}; + Literal d{.atom = 2, .is_positive = true}; + EXPECT_EQ(a, b); + EXPECT_NE(a, c); + EXPECT_NE(a, d); +} + +} // namespace +} // namespace atp |