test_swapn_basic()
Documentation for tests/amsterdam/eip8024_dupn_swapn_exchange/test_swapn.py::test_swapn_basic@b314d18e.
Generate fixtures for these test cases for Amsterdam with:
fill -v tests/amsterdam/eip8024_dupn_swapn_exchange/test_swapn.py::test_swapn_basic --fork Amsterdam
Test SWAPN with various stack indices (17-235).
Source code in tests/amsterdam/eip8024_dupn_swapn_exchange/test_swapn.py
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86 | @pytest.mark.parametrize(
"stack_index",
[17, 18, 32, 64, 107, 108, 200, 235],
ids=lambda x: f"swapn_stack_{x}",
)
def test_swapn_basic(
stack_index: int,
pre: Alloc,
state_test: StateTestFiller,
) -> None:
"""Test SWAPN with various stack indices (17-235)."""
sender = pre.fund_eoa()
# SWAPN with decoded value n swaps position 1 with position (n+1)
# So we need stack_height = stack_index + 1 items
stack_height = stack_index + 1
top_value = 0xAAAA
swap_target_value = 0xBBBB
# Build stack with known values at top and swap position (n+1)
code = Bytecode()
# First push ends up at position (stack_index+1) from top
code += Op.PUSH2(swap_target_value)
# Pushes in-between
for i in range(1, stack_height - 1):
code += Op.PUSH2(0x1000 + i)
# Last push ends up at top
code += Op.PUSH2(top_value)
# Pass stack index directly - encoder will handle encoding
code += Op.SWAPN[stack_index]
# Store both swapped values to verify
code += Op.PUSH1(0) + Op.SSTORE # New top (was swap_target_value)
# Pop intermediate values to get to the swapped position
for _ in range(stack_index - 1):
code += Op.POP
code += Op.PUSH1(1) + Op.SSTORE # New position (was top_value)
code += Op.STOP
contract_address = pre.deploy_contract(code=code)
tx = Transaction(to=contract_address, sender=sender)
post = {
contract_address: Account(
storage={
0: swap_target_value, # Top now has the swapped value
1: top_value, # Position (stack_index+1) now has original top
}
)
}
state_test(pre=pre, post=post, tx=tx)
|
Parametrized Test Cases
This test generates 8 parametrized test cases across 1 fork.