Documentation for tests/amsterdam/eip8024_dupn_swapn_exchange/test_swapn.py::test_swapn_valid_immediates@b314d18e.
Generate fixtures for these test cases for Amsterdam with:
fill -v tests/amsterdam/eip8024_dupn_swapn_exchange/test_swapn.py::test_swapn_valid_immediates --fork Amsterdam
Test SWAPN with valid immediate values (0-90 and 128-255).
Source code in tests/amsterdam/eip8024_dupn_swapn_exchange/test_swapn.py
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141 | @pytest.mark.parametrize(
"immediate",
[0, 45, 90, 128, 200, 255],
ids=lambda x: f"swapn_imm_{x}",
)
def test_swapn_valid_immediates(
immediate: int,
pre: Alloc,
state_test: StateTestFiller,
) -> None:
"""Test SWAPN with valid immediate values (0-90 and 128-255)."""
sender = pre.fund_eoa()
# Decode the immediate to get the stack index
# SWAPN with decoded value n swaps position 1 with position (n+1)
stack_index = decode_single(immediate)
stack_height = stack_index + 1
top_value = 0xAAAA
swap_target_value = 0xBBBB
# Build stack
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 immediate as bytes (raw immediate byte for testing)
code += Op.SWAPN[immediate.to_bytes(1, "big")]
# Store the new top value
code += Op.PUSH1(0) + Op.SSTORE
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
}
)
}
state_test(pre=pre, post=post, tx=tx)
|
Parametrized Test Cases
This test generates 6 parametrized test cases across 1 fork.