@Before
public void loadZ3() throws Exception {
NativeLibraries.loadLibrary("z3j");
Configuration config = Configuration.defaultConfiguration();
LogManager logger = TestLogManager.getInstance();
mgr = Z3FormulaManager.create(logger, config, ShutdownNotifier.create(), null, 42);
ifmgr = (Z3IntegerFormulaManager) mgr.getIntegerFormulaManager();
}
@Test
public void testInterpolation() throws Exception {
try (Z3InterpolatingProver prover = mgr.newProverEnvironmentWithInterpolation(false)) {
IntegerFormula x, y, z;
x = ifmgr.makeVariable("x");
y = ifmgr.makeVariable("y");
z = ifmgr.makeVariable("z");
BooleanFormula f1 = ifmgr.equal(y, ifmgr.multiply(ifmgr.makeNumber(2), x));
BooleanFormula f2 =
ifmgr.equal(y, ifmgr.add(ifmgr.makeNumber(1), ifmgr.multiply(z, ifmgr.makeNumber(2))));
prover.push(f1);
long id2 = prover.push(f2);
boolean check = prover.isUnsat();
assert check : "formulas must be contradicting";
prover.getInterpolant(Collections.singletonList(id2));
// we actually only check for a successful execution here, the result is irrelevant.
}
}