test_clz_stack_underflow()

Documentation for tests/osaka/eip7939_count_leading_zeros/test_count_leading_zeros.py::test_clz_stack_underflow@21507778.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/osaka/eip7939_count_leading_zeros/test_count_leading_zeros.py::test_clz_stack_underflow --fork Amsterdam

Test CLZ opcode with empty stack (should revert due to stack underflow).

Source code in tests/osaka/eip7939_count_leading_zeros/test_count_leading_zeros.py

@EIPChecklist.Opcode.Test.StackUnderflow()
@EIPChecklist.Opcode.Test.StackComplexOperations.StackHeights.Zero()
@pytest.mark.valid_from("Osaka")
def test_clz_stack_underflow(state_test: StateTestFiller, pre: Alloc) -> None:
    """
    Test CLZ opcode with empty stack (should revert due to stack underflow).
    """
    sender = pre.fund_eoa()
    callee_address = pre.deploy_contract(
        code=Op.CLZ + Op.STOP,  # No stack items, should underflow
    )
    caller_address = pre.deploy_contract(
        code=Op.SSTORE(0, Op.CALL(gas=0xFFFF, address=callee_address)),
        storage={"0x00": "0xdeadbeef"},
    )
    tx = Transaction(
        to=caller_address,
        sender=sender,
        gas_limit=200_000,
    )
    post = {
        caller_address: Account(
            storage={"0x00": 0}  # Call failed due to stack underflow
        ),
    }
    state_test(pre=pre, post=post, tx=tx)

Parametrized Test Cases

This test generates 1 parametrized test case across 2 forks.