def test_does_not_exist():
with pytest.raises(NameError):
contract_strategy("Foo").validate()
class StateMachine:
# stateful test information
pool_info = {}
added_pools = set()
# state machine rules
st_pool = contract_strategy("PoolMock")
st_coin = contract_strategy("yERC20")
st_coin2 = contract_strategy("yERC20")
st_underlying = contract_strategy("ERC20")
st_underlying2 = contract_strategy("ERC20")
st_decimals = strategy('uint8[8]', min_value=1, max_value=42)
st_amount = strategy('uint256', max_value=1e18)
def __init__(cls, PoolMock, accounts, registry, coins, underlying, USDT):
"""
Initial state machine setup.
This method only runs once, prior to the initial snapshot.
"""
cls.accounts = accounts
cls.registry = registry
# fund test account with initial balances
for coin in coins + underlying:
coin._mint_for_testing(1e18, {'from': accounts[0]})
coin.approve(registry, 2**256 - 1, {'from': accounts[0]})
# create pools
for i in range(3):
cls._create_pool(PoolMock, 2, coins[:2], underlying[:2], USDT)
coins.insert(0, coins.pop())
underlying.insert(0, underlying.pop())
for i in range(2):
cls._create_pool(PoolMock, 3, coins[:3], underlying[:3], USDT)
coins.insert(0, coins.pop())
underlying.insert(0, underlying.pop())
cls._create_pool(PoolMock, 4, coins, underlying, USDT)
@classmethod
def _create_pool(cls, PoolMock, n_coins, coins, underlying, USDT):
# Create a pool and add it to `cls.pool_info`
coins = coins + ([ZERO_ADDRESS] * (8 - n_coins))
underlying = underlying + ([ZERO_ADDRESS] * (8 - n_coins))
pool = PoolMock.deploy(n_coins, coins[:4], underlying[:4], 70, 4000000,
{'from': cls.accounts[0]})
cls.pool_info[pool] = {'coins': coins, 'underlying': underlying}
def setup(self):
"""
Reset test conditions between each run.
"""
self.added_pools.clear()
def rule_add_pool(self, st_pool, st_decimals):
"""
Attempt to add a pool to the registry.
Decimal values are randomized with `st_decimals` - this has no effect on
other rules, and helps to verify `Registry.get_pool_coins`
Revert Paths
------------
* The pool has already been added
"""
n_coins = st_pool.n_coins()
if st_pool in self.added_pools:
with brownie.reverts("dev: pool exists"):
self.registry.add_pool(st_pool, n_coins, ZERO_ADDRESS,
ZERO_ADDRESS, "0x00", "0x00", "0x00",
True, True, {'from': self.accounts[0]})
else:
decimals = st_decimals[:n_coins] + [0] * (8 - n_coins)
udecimals = st_decimals[-n_coins:] + [0] * (8 - n_coins)
self.registry.add_pool(st_pool, n_coins, ZERO_ADDRESS,
ZERO_ADDRESS, "0x00", pack_values(decimals),
pack_values(udecimals), True, True,
{'from': self.accounts[0]})
self.added_pools.add(st_pool)
self.pool_info[st_pool]['decimals'] = decimals
self.pool_info[st_pool]['underlying_decimals'] = udecimals
def rule_remove_pool(self, st_pool):
"""
Attempt to remove a pool from the registry.
Revert Paths
------------
* The pool has not been added, or was already removed
"""
if st_pool in self.added_pools:
self.registry.remove_pool(st_pool, {'from': self.accounts[0]})
self.added_pools.discard(st_pool)
else:
with brownie.reverts("dev: pool does not exist"):
self.registry.remove_pool(st_pool, {'from': self.accounts[0]})
def _exchange(self, pool, coin, coin2, amount):
# attempt to perform an exchange
if pool in self.added_pools and coin != coin2:
from_balance = coin.balanceOf(self.accounts[0])
to_balance = coin2.balanceOf(self.accounts[0])
if amount <= from_balance:
expected = self.registry.get_exchange_amount(
pool, coin, coin2, amount)
self.registry.exchange(pool, coin, coin2, amount, 0)
assert coin.balanceOf(
self.accounts[0]) == from_balance - amount
assert coin2.balanceOf(
self.accounts[0]) == to_balance + expected
else:
with brownie.reverts():
self.registry.exchange(pool, coin, coin2, amount, 0)
else:
with brownie.reverts():
self.registry.exchange(pool, coin, coin2, amount, 0)
def rule_exchange(self, st_coin, st_coin2, st_amount):
"""
Attempt to perform a token exchange.
The exchange is attempted with the first pool in `cls.pool_info` that
provides a market for `st_coin` and `st_coin2`.
Revert Paths
------------
* The pool has not been added
* `st_coin` and `st_coin2` are the same coin
* `accounts[0]` has an insufficient balance of `st_coin`
"""
pool = next(k for k, v in self.pool_info.items()
if st_coin in v['coins'] and st_coin2 in v['coins'])
self._exchange(pool, st_coin, st_coin2, st_amount)
def rule_exchange_underlying(self, st_underlying, st_underlying2,
st_amount):
"""
Attempt to perform a token exchange with underlying tokens.
The exchange is attempted with the first pool in `cls.pool_info` that
provides a market for `st_underlying` and `st_underlying2`.
Revert Paths
------------
* The pool has not been added
* `st_underlying` and `st_underlying` are the same coin
* `accounts[0]` has an insufficient balance of `st_underlying`
"""
pool = next(k for k, v in self.pool_info.items()
if st_underlying in v['underlying']
and st_underlying2 in v['underlying'])
self._exchange(pool, st_underlying, st_underlying2, st_amount)
def invariant_coins(self):
"""
Invariant for `get_pool_coins`
Checks
------
* Added pools should return the correct coins, underlying coins, and decimals
* Pools that were not added, or were removed, should return zero values
"""
for pool in self.pool_info:
coins = self.registry.get_pool_coins(pool)
if pool in self.added_pools:
coins = self.registry.get_pool_coins(pool)
assert coins['coins'] == self.pool_info[pool]['coins']
assert coins['underlying_coins'] == self.pool_info[pool][
'underlying']
assert coins['decimals'] == self.pool_info[pool]['decimals']
assert coins['underlying_decimals'] == self.pool_info[pool][
'underlying_decimals']
else:
assert coins['coins'] == [ZERO_ADDRESS] * 8
assert coins['underlying_coins'] == [ZERO_ADDRESS] * 8
assert coins['decimals'] == [0] * 8
assert coins['underlying_decimals'] == [0] * 8
def test_repr():
assert repr(contract_strategy("Token")) == "sampled_from(Token)"
def test_strategy():
assert isinstance(contract_strategy("ERC20"), DeferredStrategy)
#!/usr/bin/python3
import pytest
from hypothesis import HealthCheck, given, settings
from hypothesis.strategies._internal.deferred import DeferredStrategy
from brownie.network.contract import ProjectContract
from brownie.test import contract_strategy
def test_strategy():
assert isinstance(contract_strategy("ERC20"), DeferredStrategy)
def test_repr():
assert repr(contract_strategy("Token")) == "sampled_from(Token)"
def test_does_not_exist():
with pytest.raises(NameError):
contract_strategy("Foo").validate()
@given(contract=contract_strategy("BrownieTester"))
@settings(suppress_health_check=[HealthCheck.function_scoped_fixture])
def test_given(tester, contract):
assert isinstance(contract, ProjectContract)
class StateMachine:
st_contract = contract_strategy("ERC20")
st_token = strategy("uint256", max_value=9)
st_amount = strategy("uint256", max_value=2**16 * 10**18)
def __init__(cls, alice: Account, ERC20: ContractContainer,
xhibit: Contract):
cls.alice = alice
cls.xhibit = xhibit
# create 10 mock ERC20 contracts
for i in range(10):
instance = alice.deploy(ERC20, f"Test Token {i}", f"TST{i}", 18)
# mint a s#!t ton of tokens :)
instance._mint_for_testing(alice, 2**256 - 1, {"from": alice})
# approve ahead of time
instance.approve(xhibit, 2**256 - 1, {"from": alice})
# create 10 xhibit NFTs as well
xhibit.mint(alice, {"from": alice})
def setup(self):
self.state = State()
def rule_receive_erc20(
self,
st_contract: Contract,
st_token: int,
st_amount: int,
):
if st_contract.balanceOf(self.alice) >= st_amount:
st_contract.approve(self.xhibit, 2**256 - 1, {"from": self.alice})
self.xhibit.getERC20(self.alice, st_token, st_contract, st_amount)
self.state.receive_erc20(st_token, str(st_contract), st_amount)
def rule_remove_erc20(self, st_contract: Contract, st_token: int,
st_amount: int):
if self.xhibit.balanceOfERC20(st_token, st_contract) >= st_amount:
self.xhibit.transferERC20(st_token, self.alice, st_contract,
st_amount)
self.state.remove_erc20(st_token, str(st_contract), st_amount)
def rule_clear_erc20(self, st_contract: Contract, st_token: int):
balance = self.xhibit.balanceOfERC20(st_token, st_contract)
if balance > 0:
self.xhibit.transferERC20(st_token, self.alice, st_contract,
balance)
self.state.remove_erc20(st_token, str(st_contract), balance)
def invariant_totalERC20Contracts(self):
# for each xhibit NFT verify the total # of child contracts
for i in range(10):
assert self.xhibit.totalERC20Contracts(
i) == self.state.total_erc20_contracts(i)
def invariant_erc20ContractByIndex(self):
# for each xhibit NFT
for i in range(10):
erc20_contracts = {
self.xhibit.erc20ContractByIndex(i, j)
for j in range(self.state.total_erc20_contracts(i))
}
assert erc20_contracts == self.state.erc20_contracts(i)
def invariant_erc20_balance(self):
# for each xhibit NFT
for i in range(10):
erc20_contracts = {
self.xhibit.erc20ContractByIndex(i, j)
for j in range(self.state.total_erc20_contracts(i))
}
for contract in erc20_contracts:
assert (self.xhibit.balanceOfERC20(
i, contract) == self.state.tokens[i][contract])
class StateMachine:
st_contract = contract_strategy("ERC721")
st_token = strategy("uint", max_value=9)
def __init__(cls, alice: Account, ERC721: ContractContainer,
xhibit: Contract):
cls.alice = alice
cls.xhibit = xhibit
# create 10 mock ERC721 contracts
for _ in range(10):
instance = alice.deploy(ERC721)
# create 10 xhibit NFTs as well
xhibit.mint(alice, {"from": alice})
# create 10 NFTs in this contract instance
for _ in range(10):
instance._mint_for_testing(alice, {"from": alice})
def setup(self):
self.state = State()
def rule_receive_child(
self,
st_contract: Contract,
token_id: int = "st_token",
receiving_token: int = "st_token",
):
if st_contract.ownerOf(token_id) == self.alice:
st_contract.safeTransferFrom(self.alice, self.xhibit, token_id,
receiving_token, {"from": self.alice})
self.state.receive_child(receiving_token, str(st_contract),
token_id)
def rule_remove_child(
self,
st_contract: Contract,
child_token: int = "st_token",
):
if st_contract.ownerOf(child_token) == self.xhibit:
from_token = self.xhibit.ownerOfChild(st_contract, child_token)[1]
self.xhibit.transferChild(from_token, self.alice, st_contract,
child_token, {"from": self.alice})
self.state.remove_child(from_token, str(st_contract), child_token)
def invariant_totalChildContracts(self):
# for each xhibit NFT verify the total # of child contracts
for i in range(10):
assert self.xhibit.totalChildContracts(
i) == self.state.total_child_contracts(i)
def invariant_childContracts(self):
# for each xhibit NFT
for i in range(10):
child_contracts = {
self.xhibit.childContractByIndex(i, j)
for j in range(self.state.total_child_contracts(i))
}
assert child_contracts == self.state.child_contracts(i)
def invariant_totalChildTokens(self):
# for each xhibit NFT
for i in range(10):
for child_contract in self.state.child_contracts(i):
assert self.xhibit.totalChildTokens(
i, child_contract) == self.state.total_child_tokens(
i, child_contract)
def invariant_childTokens(self):
for i in range(10):
for child_contract in self.state.child_contracts(i):
child_tokens = {
self.xhibit.childTokenByIndex(i, child_contract, j)
for j in range(
self.state.total_child_tokens(i, child_contract))
}
assert child_tokens == self.state.child_tokens(
i, child_contract)
