mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2026-03-20 20:05:51 +00:00
Code Activity

Add tests for ackermannization module and Z3_algebraic_eval

Browse source 
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot] 2026-02-19 18:18:19 +00:00
parent cd32dbe403
commit 879dc93d2a
4 changed files with 328 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

37
src/test/api_algebraic.cpp
View file

@ -193,5 +193,42 @@ void tst_api_algebraic() {
ENSURE(Z3_algebraic_eq(ctx, result, neg_quarter));
}
// Test Z3_algebraic_eval: evaluate the sign of a polynomial at algebraic values.
// The mutation swapped "r > 0" with "r < 0", so tests must distinguish positive
// from negative results.
//
// Polynomial p(x0) = x0 - 2. Built using a free variable (de Bruijn index 0).
// p(3) = 1 > 0 → should return 1
// p(1) = -1 < 0 → should return -1
// p(2) = 0 = 0 → should return 0
{
Z3_sort real_sort = Z3_mk_real_sort(ctx);
// x0 is the free variable at de Bruijn index 0.
Z3_ast x0 = Z3_mk_bound(ctx, 0, real_sort);
Z3_ast c2 = Z3_mk_real(ctx, 2, 1);
Z3_ast poly_args[2] = { x0, c2 };
// p = x0 - 2
Z3_ast poly = Z3_mk_sub(ctx, 2, poly_args);
// Evaluate at 3: p(3) = 1 > 0 → +1
Z3_ast val3 = Z3_mk_real(ctx, 3, 1);
ENSURE(Z3_algebraic_is_value(ctx, val3));
int sign3 = Z3_algebraic_eval(ctx, poly, 1, &val3);
ENSURE(sign3 == 1);
// Evaluate at 1: p(1) = -1 < 0 → -1
Z3_ast val1 = Z3_mk_real(ctx, 1, 1);
ENSURE(Z3_algebraic_is_value(ctx, val1));
int sign1 = Z3_algebraic_eval(ctx, poly, 1, &val1);
ENSURE(sign1 == -1);
// Evaluate at 2: p(2) = 0 → 0
Z3_ast val2 = Z3_mk_real(ctx, 2, 1);
ENSURE(Z3_algebraic_is_value(ctx, val2));
int sign2 = Z3_algebraic_eval(ctx, poly, 1, &val2);
ENSURE(sign2 == 0);
}
Z3_del_context(ctx);
}