def test_custom_virtual_machines():
if not is_pyevm_available():
pytest.skip("PyEVM is not available")
backend = PyEVMBackend(vm_configuration=(
(0, FrontierVM),
(3, BerlinVM),
))
# This should be a FrontierVM block
VM_at_2 = backend.chain.get_vm_class_for_block_number(2)
# This should be a BerlinVM block
VM_at_3 = backend.chain.get_vm_class_for_block_number(3)
assert issubclass(VM_at_2, FrontierVM)
assert not issubclass(VM_at_2, BerlinVM)
assert issubclass(VM_at_3, BerlinVM)
# Right now, just test that EthereumTester doesn't crash
# Maybe some more sophisticated test to make sure the VMs are set correctly?
# We should to make sure the VM config translates all the way to the main
# tester, maybe with a custom VM that hard-codes some block value? that can
# be found with tester.get_block_by_number()?
EthereumTester(backend=backend)
def eth_tester():
if not is_pyevm_available():
pytest.skip("PyEVM is not available")
backend = PyEVMBackend()
return EthereumTester(backend=backend)