#[cfg(all(test, not(feature = "jit-direct-only")))]
mod tests {
    use crate::backend::VM;
    use crate::mir::{BasicBlockId, BinaryOp, ConstValue, EffectMask, MirInstruction, MirType};
    use crate::mir::{FunctionSignature, MirFunction, MirModule};

    fn make_add_main(a: i64, b: i64) -> MirModule {
        let sig = FunctionSignature {
            name: "main".to_string(),
            params: vec![],
            return_type: MirType::Integer,
            effects: EffectMask::PURE,
        };
        let mut func = MirFunction::new(sig, BasicBlockId::new(0));
        let bb = func.entry_block;
        let v0 = func.next_value_id();
        func.get_block_mut(bb)
            .unwrap()
            .add_instruction(MirInstruction::Const {
                dst: v0,
                value: ConstValue::Integer(a),
            });
        let v1 = func.next_value_id();
        func.get_block_mut(bb)
            .unwrap()
            .add_instruction(MirInstruction::Const {
                dst: v1,
                value: ConstValue::Integer(b),
            });
        let v2 = func.next_value_id();
        func.get_block_mut(bb)
            .unwrap()
            .add_instruction(MirInstruction::BinOp {
                dst: v2,
                op: BinaryOp::Add,
                lhs: v0,
                rhs: v1,
            });
        func.get_block_mut(bb)
            .unwrap()
            .add_instruction(MirInstruction::Return { value: Some(v2) });
        let mut module = MirModule::new("identical".to_string());
        module.add_function(func);
        module
    }

    #[cfg(feature = "cranelift-jit")]
    #[test]
    fn identical_vm_and_jit_add() {
        let module = make_add_main(7, 35);
        // Run VM
        let mut vm = VM::new();
        let vm_out = vm.execute_module(&module).expect("VM exec");
        let vm_s = vm_out.to_string_box().value;

        // Run JIT (Cranelift minimal)
        let jit_out = crate::backend::cranelift_compile_and_execute(&module, "identical_jit")
            .expect("JIT exec");
        let jit_s = jit_out.to_string_box().value;

        assert_eq!(vm_s, jit_s, "VM and JIT results should match");
    }

    #[cfg(feature = "cranelift-jit")]
    #[test]
    fn identical_vm_and_jit_console_log_side_effect_free() {
        // Build: const 1; extern_call env.console.log(1); return 1
        use crate::mir::{EffectMask, FunctionSignature, MirFunction, MirInstruction, MirModule};
        let sig = FunctionSignature {
            name: "main".into(),
            params: vec![],
            return_type: crate::mir::MirType::Integer,
            effects: EffectMask::PURE,
        };
        let mut func = MirFunction::new(sig, crate::mir::BasicBlockId::new(0));
        let bb = func.entry_block;
        let v0 = func.next_value_id();
        func.get_block_mut(bb)
            .unwrap()
            .add_instruction(MirInstruction::Const {
                dst: v0,
                value: crate::mir::ConstValue::Integer(1),
            });
        func.get_block_mut(bb)
            .unwrap()
            .add_instruction(MirInstruction::ExternCall {
                dst: None,
                iface_name: "env.console".to_string(),
                method_name: "log".to_string(),
                args: vec![v0],
                effects: EffectMask::IO,
            });
        func.get_block_mut(bb)
            .unwrap()
            .add_instruction(MirInstruction::Return { value: Some(v0) });
        let mut module = MirModule::new("identical_console".into());
        module.add_function(func);

        // Run VM
        let mut vm = VM::new();
        let vm_out = vm.execute_module(&module).expect("VM exec");
        let vm_s = vm_out.to_string_box().value;

        // Run JIT (Cranelift minimal) — ExternCallはスキップされる想定
        let jit_out = crate::backend::cranelift_compile_and_execute(&module, "identical_console")
            .expect("JIT exec");
        let jit_s = jit_out.to_string_box().value;

        assert_eq!(
            vm_s, jit_s,
            "VM and JIT results should match despite console.log side effects"
        );
    }
}