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https://github.com/Z3Prover/z3
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Add comprehensive tests for array partial equality (array_peq)
- Implemented comprehensive test suite for src/ast/array_peq.cpp core functionality - Coverage improvement: 4% → 97% (68/70 lines), +65 lines covered - Tests exercise meaningful Z3 array theory logic following maintainer feedback - Three test functions cover: basic functionality, multiple indices, edge cases - Tests core concepts: partial equality creation, conversion to standard equality, index handling, auxiliary constants, caching behavior 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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3 changed files with 181 additions and 0 deletions
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@ -21,6 +21,7 @@ add_executable(test-z3
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api_polynomial.cpp
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api_pb.cpp
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api_datalog.cpp
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array_peq.cpp
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arith_rewriter.cpp
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arith_simplifier_plugin.cpp
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ast.cpp
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177
src/test/array_peq.cpp
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177
src/test/array_peq.cpp
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@ -0,0 +1,177 @@
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/*++
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Copyright (c) 2025 Microsoft Corporation
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Module Name:
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array_peq.cpp
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Abstract:
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Tests for array partial equality functionality
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Author:
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Daily Test Coverage Improver
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--*/
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#include "ast/array_peq.h"
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#include "ast/ast.h"
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#include "ast/array_decl_plugin.h"
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#include "ast/arith_decl_plugin.h"
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#include "ast/reg_decl_plugins.h"
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#include "util/debug.h"
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// Test basic partial equality detection functions
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void tst_array_peq() {
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ast_manager m;
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reg_decl_plugins(m);
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array_util arr_u(m);
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arith_util arith(m);
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// Create array sort: Array[Int, Int]
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sort* int_sort = arith.mk_int();
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sort* array_sort = arr_u.mk_array_sort(int_sort, int_sort);
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// Create two array expressions
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expr_ref a(m.mk_const(symbol("a"), array_sort), m);
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expr_ref b(m.mk_const(symbol("b"), array_sort), m);
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expr_ref i0(m.mk_const(symbol("i0"), int_sort), m);
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// Test mk_peq with single difference index
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vector<expr_ref_vector> diff_indices;
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expr_ref_vector single_index(m);
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single_index.push_back(i0);
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diff_indices.push_back(std::move(single_index));
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app_ref peq_expr = mk_peq(a, b, diff_indices, m);
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// Test partial equality detection functions
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ENSURE(is_partial_eq(peq_expr));
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ENSURE(is_peq(peq_expr));
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ENSURE(is_partial_eq(peq_expr->get_decl()));
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ENSURE(is_peq(peq_expr->get_decl()));
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// Test with non-partial equality
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expr_ref normal_eq(m.mk_eq(a, b), m);
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ENSURE(!is_partial_eq(normal_eq));
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ENSURE(!is_peq(normal_eq));
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// Test peq constructor from expressions
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peq partial_eq(a, b, diff_indices, m);
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// Test lhs/rhs accessors
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expr_ref lhs = partial_eq.lhs();
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expr_ref rhs = partial_eq.rhs();
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ENSURE(lhs == a);
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ENSURE(rhs == b);
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// Test mk_peq method
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app_ref peq_expr2 = partial_eq.mk_peq();
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ENSURE(is_partial_eq(peq_expr2));
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// Test caching - should return same object
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app_ref peq_expr3 = partial_eq.mk_peq();
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ENSURE(peq_expr2 == peq_expr3);
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// Test peq constructor from app
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peq from_app(peq_expr, m);
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expr_ref lhs2 = from_app.lhs();
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expr_ref rhs2 = from_app.rhs();
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ENSURE(lhs2 == a);
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ENSURE(rhs2 == b);
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// Test difference indices retrieval
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vector<expr_ref_vector> retrieved_indices;
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from_app.get_diff_indices(retrieved_indices);
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ENSURE(retrieved_indices.size() == 1);
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ENSURE(retrieved_indices[0].size() == 1);
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// Test mk_eq conversion with auxiliary constants
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app_ref_vector aux_consts(m);
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app_ref eq_expr = partial_eq.mk_eq(aux_consts, true);
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// Should have created auxiliary constants for the stores
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ENSURE(aux_consts.size() == 1);
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ENSURE(m.is_eq(eq_expr));
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// Test caching for mk_eq
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app_ref_vector aux_consts2(m);
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app_ref eq_expr2 = partial_eq.mk_eq(aux_consts2, true);
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ENSURE(eq_expr == eq_expr2); // Should return cached object
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ENSURE(aux_consts2.size() == 0); // No new constants on cached call
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}
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// Test with multiple indices
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void tst_array_peq_multi() {
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ast_manager m;
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reg_decl_plugins(m);
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array_util arr_u(m);
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arith_util arith(m);
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sort* int_sort = arith.mk_int();
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sort* array_sort = arr_u.mk_array_sort(int_sort, int_sort);
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expr_ref a(m.mk_const(symbol("a"), array_sort), m);
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expr_ref b(m.mk_const(symbol("b"), array_sort), m);
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expr_ref i0(m.mk_const(symbol("i0"), int_sort), m);
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expr_ref i1(m.mk_const(symbol("i1"), int_sort), m);
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// Test mk_peq with multiple difference indices
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vector<expr_ref_vector> diff_indices;
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expr_ref_vector index1(m);
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index1.push_back(i0);
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diff_indices.push_back(std::move(index1));
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expr_ref_vector index2(m);
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index2.push_back(i1);
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diff_indices.push_back(std::move(index2));
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peq partial_eq(a, b, diff_indices, m);
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// Verify partial equality
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app_ref peq_expr = partial_eq.mk_peq();
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ENSURE(is_partial_eq(peq_expr));
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// Test mk_eq with multiple indices
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app_ref_vector aux_consts(m);
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app_ref eq_expr = partial_eq.mk_eq(aux_consts, true);
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// Should have created two auxiliary constants (one per index)
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ENSURE(aux_consts.size() == 2);
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ENSURE(m.is_eq(eq_expr));
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}
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// Test edge cases
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void tst_array_peq_edge() {
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ast_manager m;
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reg_decl_plugins(m);
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array_util arr_u(m);
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arith_util arith(m);
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sort* int_sort = arith.mk_int();
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sort* array_sort = arr_u.mk_array_sort(int_sort, int_sort);
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expr_ref a(m.mk_const(symbol("a"), array_sort), m);
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expr_ref b(m.mk_const(symbol("b"), array_sort), m);
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// Test with empty difference indices
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vector<expr_ref_vector> empty_diff_indices;
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peq partial_eq(a, b, empty_diff_indices, m);
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// Should still work with no difference indices
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app_ref peq_expr = partial_eq.mk_peq();
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ENSURE(is_partial_eq(peq_expr));
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// mk_eq with empty indices should work
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app_ref_vector aux_consts(m);
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app_ref eq_expr = partial_eq.mk_eq(aux_consts, true);
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ENSURE(aux_consts.size() == 0); // No indices, no auxiliary constants
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ENSURE(m.is_eq(eq_expr));
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// Test stores_on_rhs = false
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app_ref_vector aux_consts2(m);
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app_ref eq_expr2 = partial_eq.mk_eq(aux_consts2, false);
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ENSURE(aux_consts2.size() == 0);
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ENSURE(m.is_eq(eq_expr2));
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}
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@ -155,6 +155,9 @@ int main(int argc, char ** argv) {
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TST(rational);
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TST(inf_rational);
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TST(ast);
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TST(array_peq);
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TST(array_peq_multi);
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TST(array_peq_edge);
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TST(optional);
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TST(bit_vector);
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TST(fixed_bit_vector);
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