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feat(tests): add test for CLZ opcode with varying gas costs #1859

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Merged
merged 5 commits into from
Jul 7, 2025
Merged

feat(tests): add test for CLZ opcode with varying gas costs #1859

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23a2dd2
feat(tests): add test for CLZ opcode with varying gas costs
LouisTsai-Csie Jul 4, 2025
9bed579
refactor(tests): rename and update CLZ gas cost test to handle bounda…
LouisTsai-Csie Jul 4, 2025
f82626f
refactor(tests): rename CLZ gas cost test for clarity
LouisTsai-Csie Jul 4, 2025
052e6f5
refactor(tests): parameterize for varying leading zero lengths
LouisTsai-Csie Jul 4, 2025
b0433ff
refactor(tests): update contract deployment to include storage
LouisTsai-Csie Jul 7, 2025
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36 changes: 35 additions & 1 deletion tests/osaka/eip7939_count_leading_zeros/test_count_leading_zeros.py
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Original file line number Diff line number Diff line change
Expand Up @@ -108,7 +108,7 @@ def test_clz_opcode_scenarios(


@pytest.mark.valid_from("Osaka")
def test_clz_gas(state_test: StateTestFiller, pre: Alloc, fork: Fork):
def test_clz_gas_cost(state_test: StateTestFiller, pre: Alloc, fork: Fork):
"""Test CLZ opcode gas cost."""
contract_address = pre.deploy_contract(
Op.SSTORE(
Expand All @@ -131,6 +131,40 @@ def test_clz_gas(state_test: StateTestFiller, pre: Alloc, fork: Fork):
state_test(pre=pre, post=post, tx=tx)


@pytest.mark.valid_from("Osaka")
@pytest.mark.parametrize("bits", [0, 64, 128, 255])
@pytest.mark.parametrize("gas_cost_delta", [-2, -1, 0, 1, 2])
def test_clz_gas_cost_boundary(
state_test: StateTestFiller,
pre: Alloc,
fork: Fork,
bits: int,
gas_cost_delta: int,
):
"""Test CLZ opcode gas cost boundary."""
code = Op.PUSH32(1 << bits) + Op.CLZ

contract_address = pre.deploy_contract(code=code)

call_code = Op.SSTORE(
0,
Op.CALL(
gas=fork.gas_costs().G_VERY_LOW + Spec.CLZ_GAS_COST + gas_cost_delta,
address=contract_address,
),
)
call_address = pre.deploy_contract(
code=call_code,
storage={"0x00": "0xdeadbeef"},
)

tx = Transaction(to=call_address, sender=pre.fund_eoa(), gas_limit=200_000)

post = {call_address: Account(storage={"0x00": 0 if gas_cost_delta < 0 else 1})}

state_test(pre=pre, post=post, tx=tx)


@pytest.mark.valid_from("Osaka")
def test_clz_stack_underflow(state_test: StateTestFiller, pre: Alloc):
"""Test CLZ opcode with empty stack (should revert due to stack underflow)."""
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