def create_debt(web3: Web3, mcd: DssDeployment, our_address: Address, deployment_address: Address):
assert isinstance(web3, Web3)
assert isinstance(mcd, DssDeployment)
assert isinstance(our_address, Address)
assert isinstance(deployment_address, Address)
# Create a vault
collateral = mcd.collaterals['ETH-A']
ilk = collateral.ilk
wrap_eth(mcd, deployment_address, Wad.from_number(1))
collateral.approve(deployment_address)
assert collateral.adapter.join(deployment_address, Wad.from_number(1)).transact(
from_address=deployment_address)
frob(mcd, collateral, deployment_address, dink=Wad.from_number(1), dart=Wad(0))
dart = max_dart(mcd, collateral, deployment_address) - Wad(1)
frob(mcd, collateral, deployment_address, dink=Wad(0), dart=dart)
assert not mcd.cat.can_bite(ilk, mcd.vat.urn(collateral.ilk, deployment_address))
# Undercollateralize by dropping the spot price, and then bite the vault
to_price = Wad(Web3.toInt(collateral.pip.read())) / Wad.from_number(2)
set_collateral_price(mcd, collateral, to_price)
urn = mcd.vat.urn(collateral.ilk, deployment_address)
assert urn.ink is not None and urn.art is not None
assert ilk.spot is not None
safe = Ray(urn.art) * mcd.vat.ilk(ilk.name).rate <= Ray(urn.ink) * ilk.spot
assert not safe
assert mcd.cat.can_bite(collateral.ilk, urn)
assert mcd.cat.bite(collateral.ilk, urn).transact()
flip_kick = collateral.flipper.kicks()
# Generate some Dai, bid on and win the flip auction without covering all the debt
wrap_eth(mcd, our_address, Wad.from_number(10))
collateral.approve(our_address)
assert collateral.adapter.join(our_address, Wad.from_number(10)).transact(from_address=our_address)
web3.eth.defaultAccount = our_address.address
frob(mcd, collateral, our_address, dink=Wad.from_number(10), dart=Wad.from_number(200))
collateral.flipper.approve(mcd.vat.address, approval_function=hope_directly())
current_bid = collateral.flipper.bids(flip_kick)
urn = mcd.vat.urn(collateral.ilk, our_address)
assert Rad(urn.art) > current_bid.tab
bid = Rad.from_number(6)
TestFlipper.tend(collateral.flipper, flip_kick, our_address, current_bid.lot, bid)
mcd.vat.can(our_address, collateral.flipper.address)
wait(mcd, our_address, collateral.flipper.ttl()+1)
assert collateral.flipper.deal(flip_kick).transact()
# Raise debt from the queue (note that vow.wait is 0 on our testchain)
bites = mcd.cat.past_bites(100)
for bite in bites:
era_bite = bite.era(web3)
assert era_bite > int(datetime.now().timestamp()) - 120
assert mcd.vow.sin_of(era_bite) > Rad(0)
assert mcd.vow.flog(era_bite).transact()
assert mcd.vow.sin_of(era_bite) == Rad(0)
# Cancel out surplus and debt
dai_vow = mcd.vat.dai(mcd.vow.address)
assert dai_vow <= mcd.vow.woe()
assert mcd.vow.heal(dai_vow).transact()
assert mcd.vow.woe() >= mcd.vow.sump()
def open_underwater_urn(mcd: DssDeployment, collateral: Collateral, address: Address):
open_cdp(mcd, collateral, address, 50)
previous_eth_price = mcd.vat.ilk(collateral.ilk.name).spot
print(f"PREV ETH PRICE {previous_eth_price}")
set_collateral_price(mcd, collateral, Wad.from_number(49))
urn = mcd.vat.urn(collateral.ilk, address)
ilk = mcd.vat.ilk(collateral.ilk.name)
mat = mcd.spotter.mat(ilk)
assert (urn.art * ilk.rate) > (urn.ink * ilk.spot * mat)
return previous_eth_price
def test_scenario(self, web3, mcd, flopper, our_address, other_address,
deployment_address):
create_debt(web3, mcd, our_address, deployment_address)
# Kick off the flop auction
assert flopper.kicks() == 0
assert len(flopper.active_auctions()) == 0
assert mcd.vat.dai(mcd.vow.address) == Rad(0)
assert mcd.vow.flop().transact()
kick = flopper.kicks()
assert kick == 1
assert len(flopper.active_auctions()) == 1
check_active_auctions(flopper)
current_bid = flopper.bids(kick)
log = self.last_log(flopper)
assert isinstance(log, Flopper.KickLog)
assert log.id == kick
assert log.lot == current_bid.lot
assert log.bid == current_bid.bid
assert log.gal == mcd.vow.address
# Allow the auction to expire, and then resurrect it
time_travel_by(web3, flopper.tau() + 1)
assert flopper.tick(kick).transact()
assert flopper.bids(kick).lot == current_bid.lot * flopper.pad()
# Bid on the resurrected auction
bid = Wad.from_number(0.000005)
flopper.approve(mcd.vat.address, hope_directly())
assert mcd.vat.can(our_address, flopper.address)
TestFlopper.dent(flopper, kick, our_address, bid, current_bid.bid)
current_bid = flopper.bids(kick)
assert current_bid.guy == our_address
# Confirm victory
time_travel_by(web3, flopper.ttl() + 1)
assert flopper.live()
now = int(datetime.now().timestamp())
assert (current_bid.tic < now
and current_bid.tic != 0) or current_bid.end < now
mkr_before = mcd.mkr.balance_of(our_address)
assert flopper.deal(kick).transact(from_address=our_address)
mkr_after = mcd.mkr.balance_of(our_address)
assert mkr_after > mkr_before
log = self.last_log(flopper)
assert isinstance(log, Flopper.DealLog)
assert log.usr == our_address
assert log.id == kick
# Cleanup
collateral = mcd.collaterals['ETH-A']
set_collateral_price(mcd, collateral, Wad.from_number(230))
def create_flip_auction(mcd: DssDeployment, deployment_address: Address,
our_address: Address):
assert isinstance(mcd, DssDeployment)
assert isinstance(our_address, Address)
assert isinstance(deployment_address, Address)
# Create a CDP
collateral = mcd.collaterals['ETH-A']
ilk = collateral.ilk
wrap_eth(mcd, deployment_address, Wad.from_number(1))
collateral.approve(deployment_address)
assert collateral.adapter.join(
deployment_address,
Wad.from_number(1)).transact(from_address=deployment_address)
frob(mcd,
collateral,
deployment_address,
dink=Wad.from_number(1),
dart=Wad(0))
dart = max_dart(mcd, collateral, deployment_address) - Wad(1)
frob(mcd, collateral, deployment_address, dink=Wad(0), dart=dart)
# Undercollateralize and bite the CDP
to_price = Wad(mcd.web3.toInt(collateral.pip.read())) / Wad.from_number(2)
set_collateral_price(mcd, collateral, to_price)
urn = mcd.vat.urn(collateral.ilk, deployment_address)
ilk = mcd.vat.ilk(ilk.name)
safe = Ray(urn.art) * mcd.vat.ilk(ilk.name).rate <= Ray(urn.ink) * ilk.spot
assert not safe
assert mcd.cat.can_bite(collateral.ilk, Urn(deployment_address))
assert mcd.cat.bite(collateral.ilk, Urn(deployment_address)).transact()
flip_kick = collateral.flipper.kicks()
# Generate some Dai, bid on the flip auction without covering all the debt
wrap_eth(mcd, our_address, Wad.from_number(10))
collateral.approve(our_address)
assert collateral.adapter.join(
our_address, Wad.from_number(10)).transact(from_address=our_address)
mcd.web3.eth.defaultAccount = our_address.address
frob(mcd,
collateral,
our_address,
dink=Wad.from_number(10),
dart=Wad.from_number(200))
collateral.flipper.approve(mcd.vat.address,
approval_function=hope_directly())
current_bid = collateral.flipper.bids(flip_kick)
urn = mcd.vat.urn(collateral.ilk, our_address)
assert Rad(urn.art) > current_bid.tab
bid = Rad.from_number(6)
tend(collateral.flipper, flip_kick, our_address, current_bid.lot, bid)
def test_get_underwater_urns(self, mcd: DssDeployment, keeper: CageKeeper, guy_address: Address, our_address: Address):
print_out("test_get_underwater_urns")
previous_eth_price = open_underwater_urn(mcd, mcd.collaterals['ETH-A'], guy_address)
open_cdp(mcd, mcd.collaterals['ETH-C'], our_address)
urns = keeper.get_underwater_urns()
assert type(urns) is list
assert all(isinstance(x, Urn) for x in urns)
assert len(urns) == 1
assert urns[0].address.address == guy_address.address
set_collateral_price(mcd, mcd.collaterals['ETH-A'], Wad(previous_eth_price))
pytest.global_urns = urns
def test_get_underwater_urns(self, mcd: DssDeployment, keeper: CageKeeper,
guy_address: Address, our_address: Address):
print_out("test_get_underwater_urns")
previous_eth_price = open_underwater_urn(mcd, mcd.collaterals['ETH-A'],
guy_address)
open_vault(mcd, mcd.collaterals['ETH-C'], our_address)
ilks = keeper.get_ilks()
urns = keeper.get_underwater_urns(ilks)
assert type(urns) is list
assert all(isinstance(x, Urn) for x in urns)
assert len(urns) == 1
assert urns[0].address.address == guy_address.address
## We've multiplied by a small Ray amount to counteract
## the residual dust (or lack thereof) in this step that causes
## create_flop_auction fail
set_collateral_price(mcd, mcd.collaterals['ETH-A'],
Wad(previous_eth_price * Ray.from_number(1.0001)))
pytest.global_urns = urns
def test_scenario(self, web3, mcd, collateral, clipper, our_address,
other_address, deployment_address):
dirt_before = mcd.dog.dog_dirt()
vice_before = mcd.vat.vice()
sin_before = mcd.vow.sin()
# Create a vault
ilk = collateral.ilk
ink = Wad.from_number(1)
wrap_eth(mcd, deployment_address, ink)
collateral.approve(deployment_address)
assert collateral.adapter.join(
deployment_address, ink).transact(from_address=deployment_address)
frob(mcd, collateral, deployment_address, dink=ink, dart=Wad(0))
dart = max_dart(mcd, collateral, deployment_address) - Wad(1)
frob(mcd, collateral, deployment_address, dink=Wad(0), dart=dart)
# Mint and withdraw all the Dai
mcd.approve_dai(deployment_address)
assert mcd.dai_adapter.exit(
deployment_address, dart).transact(from_address=deployment_address)
# Undercollateralize the vault
to_price = Wad(Web3.toInt(collateral.pip.read())) / Wad.from_number(2)
set_collateral_price(mcd, collateral, to_price)
urn = mcd.vat.urn(collateral.ilk, deployment_address)
ilk = mcd.vat.ilk(ilk.name)
safe = Ray(urn.art) * mcd.vat.ilk(ilk.name).rate <= Ray(
urn.ink) * ilk.spot
assert not safe
assert clipper.active_count() == 0
# Bark the vault, which moves debt to the vow and kicks the clipper
dai_before_bark: Rad = mcd.vat.dai(our_address)
urn = mcd.vat.urn(collateral.ilk, deployment_address)
assert urn.ink > Wad(0)
tab = urn.art * ilk.rate # Wad
assert tab == dart
assert mcd.dog.bark(ilk, urn).transact()
barks = mcd.dog.past_barks(1)
assert len(barks) == 1
last_bite = barks[0]
assert last_bite.due > Rad(0)
assert clipper.active_count() == 1
kick = clipper.kicks()
assert kick == 1
assert len(clipper.active_auctions()) == 1
assert clipper.active_auctions()[0].id == 1
assert mcd.active_auctions()['clips']['ETH-B'][0].id == 1
urn = mcd.vat.urn(collateral.ilk, deployment_address)
(needs_redo, price, lot, tab) = clipper.status(kick)
assert not needs_redo
assert price == Ray.from_number(172.5)
assert lot == ink
assert float(tab) == 105.0
# Check vat, vow, and dog
assert urn.ink == Wad(0)
assert vice_before < mcd.vat.vice()
assert sin_before < mcd.vow.sin()
assert dirt_before < mcd.dog.dog_dirt()
# Check the clipper
current_sale = clipper.sales(kick)
assert isinstance(current_sale, Clipper.Sale)
assert current_sale.pos == 0
assert float(current_sale.tab) == 105.0
assert current_sale.lot == ink
assert current_sale.usr == deployment_address
assert current_sale.tic > 0
assert round(current_sale.top, 1) == price
coin = Rad(clipper.tip() + (current_sale.tab * clipper.chip()))
# Confirm we received our liquidation reward
dai_after_bark: Rad = mcd.vat.dai(our_address)
assert dai_after_bark == dai_before_bark + coin
kick_log = self.last_log(clipper)
assert isinstance(kick_log, Clipper.KickLog)
assert kick_log.id == kick
assert kick_log.top == current_sale.top
assert kick_log.tab == current_sale.tab
assert kick_log.lot == current_sale.lot
assert kick_log.usr == deployment_address
assert kick_log.kpr == our_address
assert kick_log.coin == coin
# Wrap some eth and handle approvals before bidding
eth_required = Wad(
current_sale.tab / Rad(ilk.spot)) * Wad.from_number(1.1)
wrap_eth(mcd, our_address, eth_required)
collateral.approve(our_address)
assert collateral.adapter.join(
our_address, eth_required).transact(from_address=our_address)
clipper.approve(
mcd.vat.address,
approval_function=hope_directly(from_address=our_address))
# Ensure we cannot take collateral below the current price
(needs_redo, price, lot, tab) = clipper.status(kick)
with pytest.raises(AssertionError):
clipper.validate_take(kick, ink, price - Ray.from_number(1))
assert not clipper.take(
kick, ink, Ray.from_number(140)).transact(from_address=our_address)
# Take some collateral with max above the top price
clipper.validate_take(kick, Wad.from_number(0.07),
Ray.from_number(180))
assert web3.eth.defaultAccount == our_address.address
assert clipper.take(
kick, Wad.from_number(0.07),
Ray.from_number(180)).transact(from_address=our_address)
(needs_redo, price, lot, tab) = clipper.status(kick)
assert not needs_redo
current_sale = clipper.sales(kick)
assert current_sale.lot > Wad(0)
assert current_sale.top > price
assert Rad(0) < current_sale.tab < kick_log.tab
first_take_log = self.last_log(clipper)
assert first_take_log.id == 1
assert first_take_log.max == Ray.from_number(180)
assert first_take_log.price == price
assert first_take_log.lot == current_sale.lot
assert first_take_log.usr == deployment_address
assert first_take_log.sender == our_address
assert round(first_take_log.owe,
18) == round(Rad.from_number(0.07) * Rad(price), 18)
# Allow the auction to expire, and then resurrect it
# TODO: If abaci contract is ever wrapped, read tau from it
time_travel_by(web3, 24)
(needs_redo, price, lot, tab) = clipper.status(kick)
assert needs_redo
assert len(clipper.active_auctions()) == clipper.active_count()
assert clipper.redo(kick, our_address).transact()
(needs_redo, price, lot, tab) = clipper.status(kick)
assert not needs_redo
current_sale = clipper.sales(kick)
assert current_sale.lot > Wad(0)
redo_log = self.last_log(clipper)
assert isinstance(redo_log, Clipper.RedoLog)
assert redo_log.id == kick
assert redo_log.top == current_sale.top
assert redo_log.tab == current_sale.tab
assert redo_log.lot == current_sale.lot
assert redo_log.usr == deployment_address
assert redo_log.kpr == our_address
coin = Rad(clipper.tip() + (current_sale.tab * clipper.chip()))
assert round(float(redo_log.coin), 18) == round(float(coin), 18)
# Sleep until price has gone down enough to bid with remaining Dai
dai = mcd.vat.dai(our_address)
last_price = price
print(
f"Bid cost={float(price * Ray(current_sale.lot))}, Dai balance={float(dai)}"
)
while price * Ray(current_sale.lot) > Ray(dai):
print(
f"Bid cost {price * Ray(current_sale.lot)} exceeds Dai balance {dai}"
)
time_travel_by(web3, 2)
(needs_redo, price, lot, tab) = clipper.status(kick)
assert price < last_price
assert not needs_redo
last_price = price
clipper.validate_take(kick, current_sale.lot, price)
assert clipper.take(kick, current_sale.lot,
price).transact(from_address=our_address)
current_sale = clipper.sales(kick)
assert current_sale.lot == Wad(0)
assert current_sale.tab == Rad(0)
assert clipper.active_count() == 0
assert len(clipper.active_auctions()) == 0
# Ensure we can retrieve our collateral
collateral_before = collateral.gem.balance_of(our_address)
assert collateral.adapter.exit(our_address,
ink).transact(from_address=our_address)
collateral_after = collateral.gem.balance_of(our_address)
assert collateral_before < collateral_after
# Cleanup
set_collateral_price(mcd, collateral, Wad.from_number(230))
cleanup_urn(mcd, collateral, our_address)
def test_scenario(self, web3, mcd, collateral, flipper, our_address,
other_address, deployment_address):
# Create a vault
kicks_before = flipper.kicks()
ilk = collateral.ilk
ink = Wad.from_number(0.5)
wrap_eth(mcd, deployment_address, ink)
collateral.approve(deployment_address)
assert collateral.adapter.join(
deployment_address, ink).transact(from_address=deployment_address)
frob(mcd, collateral, deployment_address, dink=ink, dart=Wad(0))
dart = max_dart(mcd, collateral, deployment_address) - Wad(1)
frob(mcd, collateral, deployment_address, dink=Wad(0), dart=dart)
# Mint and withdraw all the Dai
mcd.approve_dai(deployment_address)
assert mcd.dai_adapter.exit(
deployment_address, dart).transact(from_address=deployment_address)
assert mcd.dai.balance_of(deployment_address) == dart
# Undercollateralize the vault
to_price = Wad(Web3.toInt(collateral.pip.read())) / Wad.from_number(2)
set_collateral_price(mcd, collateral, to_price)
urn = mcd.vat.urn(collateral.ilk, deployment_address)
ilk = mcd.vat.ilk(ilk.name)
assert ilk.rate is not None
assert ilk.spot is not None
safe = Ray(urn.art) * mcd.vat.ilk(ilk.name).rate <= Ray(
urn.ink) * ilk.spot
assert not safe
assert len(flipper.active_auctions()) == 0
litter_before = mcd.cat.litter()
# Bite the vault, which moves debt to the vow and kicks the flipper
urn = mcd.vat.urn(collateral.ilk, deployment_address)
assert urn.ink > Wad(0)
art = min(urn.art, Wad(mcd.cat.dunk(ilk))) # Wad
tab = art * ilk.rate # Wad
assert tab == dart
assert mcd.cat.can_bite(ilk, urn)
assert mcd.cat.bite(ilk, urn).transact()
kick = flipper.kicks()
assert kick == kicks_before + 1
urn = mcd.vat.urn(collateral.ilk, deployment_address)
# Check vat, vow, and cat
assert urn.ink == Wad(0)
assert urn.art == dart - art
assert mcd.vat.vice() > Rad(0)
assert mcd.vow.sin() == Rad(tab)
bites = mcd.cat.past_bites(1)
assert len(bites) == 1
last_bite = bites[0]
assert last_bite.tab > Rad(0)
assert last_bite.id == 1
litter_after = mcd.cat.litter()
assert litter_before < litter_after
# Check the flipper
current_bid = flipper.bids(kick)
assert isinstance(current_bid, Flipper.Bid)
assert current_bid.lot > Wad(0)
assert current_bid.tab > Rad(0)
assert current_bid.bid == Rad(0)
# Cat doesn't incorporate the liquidation penalty (chop), but the kicker includes it.
# Awaiting word from @dc why this is so.
#assert last_bite.tab == current_bid.tab
log = self.last_log(flipper)
assert isinstance(log, Flipper.KickLog)
assert log.id == kick
assert log.lot == current_bid.lot
assert log.bid == current_bid.bid
assert log.tab == current_bid.tab
assert log.usr == deployment_address
assert log.gal == mcd.vow.address
# Allow the auction to expire, and then resurrect it
time_travel_by(web3, flipper.tau() + 1)
assert flipper.tick(kick).transact()
# Wrap some eth and handle approvals before bidding
eth_required = Wad(
current_bid.tab / Rad(ilk.spot)) * Wad.from_number(1.13)
wrap_eth(mcd, other_address, eth_required)
collateral.approve(other_address)
assert collateral.adapter.join(
other_address, eth_required).transact(from_address=other_address)
wrap_eth(mcd, our_address, eth_required)
collateral.approve(our_address)
assert collateral.adapter.join(
our_address, eth_required).transact(from_address=our_address)
# Test the _tend_ phase of the auction
flipper.approve(
mcd.vat.address,
approval_function=hope_directly(from_address=other_address))
# Add Wad(1) to counter precision error converting tab from Rad to Wad
frob(mcd,
collateral,
other_address,
dink=eth_required,
dart=Wad(current_bid.tab) + Wad(1))
urn = mcd.vat.urn(collateral.ilk, other_address)
assert Rad(urn.art) >= current_bid.tab
# Bid the tab to instantly transition to dent stage
TestFlipper.tend(flipper, kick, other_address, current_bid.lot,
current_bid.tab)
current_bid = flipper.bids(kick)
assert current_bid.guy == other_address
assert current_bid.bid == current_bid.tab
assert len(flipper.active_auctions()) == 1
check_active_auctions(flipper)
log = self.last_log(flipper)
assert isinstance(log, Flipper.TendLog)
assert log.guy == current_bid.guy
assert log.id == current_bid.id
assert log.lot == current_bid.lot
assert log.bid == current_bid.bid
# Test the _dent_ phase of the auction
flipper.approve(
mcd.vat.address,
approval_function=hope_directly(from_address=our_address))
frob(mcd,
collateral,
our_address,
dink=eth_required,
dart=Wad(current_bid.tab) + Wad(1))
lot = current_bid.lot - Wad.from_number(0.3)
assert flipper.beg() * lot <= current_bid.lot
TestFlipper.dent(flipper, kick, our_address, lot, current_bid.tab)
current_bid = flipper.bids(kick)
assert current_bid.guy == our_address
assert current_bid.bid == current_bid.tab
assert current_bid.lot == lot
log = self.last_log(flipper)
assert isinstance(log, Flipper.DentLog)
assert log.guy == current_bid.guy
assert log.id == current_bid.id
assert log.lot == current_bid.lot
assert log.bid == current_bid.bid
# Exercise _deal_ after bid has expired
time_travel_by(web3, flipper.ttl() + 1)
now = datetime.now().timestamp()
assert 0 < current_bid.tic < now or current_bid.end < now
assert flipper.deal(kick).transact(from_address=our_address)
assert len(flipper.active_auctions()) == 0
log = self.last_log(flipper)
assert isinstance(log, Flipper.DealLog)
assert log.usr == our_address
# Grab our collateral
collateral_before = collateral.gem.balance_of(our_address)
assert collateral.adapter.exit(
our_address, current_bid.lot).transact(from_address=our_address)
collateral_after = collateral.gem.balance_of(our_address)
assert collateral_before < collateral_after
# Cleanup
set_collateral_price(mcd, collateral, Wad.from_number(230))
cleanup_urn(mcd, collateral, other_address)
def test_scenario(self, web3, mcd, collateral, flipper, our_address,
other_address, deployment_address):
# Create a CDP
collateral = mcd.collaterals['ETH-A']
kicks_before = flipper.kicks()
ilk = collateral.ilk
wrap_eth(mcd, deployment_address, Wad.from_number(1))
collateral.approve(deployment_address)
assert collateral.adapter.join(
deployment_address,
Wad.from_number(1)).transact(from_address=deployment_address)
frob(mcd,
collateral,
deployment_address,
dink=Wad.from_number(1),
dart=Wad(0))
dart = max_dart(mcd, collateral, deployment_address) - Wad(1)
frob(mcd, collateral, deployment_address, dink=Wad(0), dart=dart)
# Mint and withdraw all the Dai
mcd.approve_dai(deployment_address)
assert mcd.dai_adapter.exit(
deployment_address, dart).transact(from_address=deployment_address)
assert mcd.dai.balance_of(deployment_address) == dart
assert mcd.vat.dai(deployment_address) == Rad(0)
# Undercollateralize the CDP
to_price = Wad(Web3.toInt(collateral.pip.read())) / Wad.from_number(2)
set_collateral_price(mcd, collateral, to_price)
urn = mcd.vat.urn(collateral.ilk, deployment_address)
ilk = mcd.vat.ilk(ilk.name)
assert ilk.rate is not None
assert ilk.spot is not None
safe = Ray(urn.art) * mcd.vat.ilk(ilk.name).rate <= Ray(
urn.ink) * ilk.spot
assert not safe
assert len(flipper.active_auctions()) == 0
# Bite the CDP, which moves debt to the vow and kicks the flipper
urn = mcd.vat.urn(collateral.ilk, deployment_address)
assert urn.ink > Wad(0)
lot = min(urn.ink, mcd.cat.lump(ilk)) # Wad
art = min(urn.art, (lot * urn.art) / urn.ink) # Wad
tab = art * ilk.rate # Wad
assert tab == dart
simulate_bite(mcd, collateral, deployment_address)
assert mcd.cat.bite(collateral.ilk, Urn(deployment_address)).transact()
kick = flipper.kicks()
assert kick == kicks_before + 1
urn = mcd.vat.urn(collateral.ilk, deployment_address)
# Check vat, vow, and cat
assert urn.ink == Wad(0)
assert urn.art == dart - art
assert mcd.vat.vice() > Rad(0)
assert mcd.vow.sin() == Rad(tab)
bites = mcd.cat.past_bite(10)
assert len(bites) == 1
last_bite = bites[0]
assert last_bite.tab > Rad(0)
# Check the flipper
current_bid = flipper.bids(kick)
assert isinstance(current_bid, Flipper.Bid)
assert current_bid.lot > Wad(0)
assert current_bid.tab > Rad(0)
assert current_bid.bid == Rad(0)
# Cat doesn't incorporate the liquidation penalty (chop), but the kicker includes it.
# Awaiting word from @dc why this is so.
#assert last_bite.tab == current_bid.tab
# Wrap some eth and handle approvals before bidding
eth_required = Wad(
current_bid.tab / Rad(ilk.spot)) * Wad.from_number(1.1)
wrap_eth(mcd, other_address, eth_required)
collateral.approve(other_address)
assert collateral.adapter.join(
other_address, eth_required).transact(from_address=other_address)
wrap_eth(mcd, our_address, eth_required)
collateral.approve(our_address)
assert collateral.adapter.join(
our_address, eth_required).transact(from_address=our_address)
# Test the _tend_ phase of the auction
flipper.approve(
mcd.vat.address,
approval_function=hope_directly(from_address=other_address))
# Add Wad(1) to counter precision error converting tab from Rad to Wad
frob(mcd,
collateral,
other_address,
dink=eth_required,
dart=Wad(current_bid.tab) + Wad(1))
urn = mcd.vat.urn(collateral.ilk, other_address)
assert Rad(urn.art) >= current_bid.tab
# Bid the tab to instantly transition to dent stage
TestFlipper.tend(flipper, kick, other_address, current_bid.lot,
current_bid.tab)
current_bid = flipper.bids(kick)
assert current_bid.guy == other_address
assert current_bid.bid == current_bid.tab
# Test the _dent_ phase of the auction
flipper.approve(
mcd.vat.address,
approval_function=hope_directly(from_address=our_address))
frob(mcd,
collateral,
our_address,
dink=eth_required,
dart=Wad(current_bid.tab) + Wad(1))
lot = current_bid.lot - Wad.from_number(0.2)
assert flipper.beg() * Ray(lot) <= Ray(current_bid.lot)
assert mcd.vat.can(our_address, flipper.address)
TestFlipper.dent(flipper, kick, our_address, lot, current_bid.tab)
current_bid = flipper.bids(kick)
assert current_bid.guy == our_address
assert current_bid.bid == current_bid.tab
assert current_bid.lot == lot
# Exercise _deal_ after bid has expired
wait(mcd, our_address, flipper.ttl() + 1)
now = datetime.now().timestamp()
assert 0 < current_bid.tic < now or current_bid.end < now
assert flipper.deal(kick).transact(from_address=our_address)
assert len(flipper.active_auctions()) == 0
# Grab our collateral
collateral_before = collateral.gem.balance_of(our_address)
assert collateral.adapter.exit(
our_address, current_bid.lot).transact(from_address=our_address)
collateral_after = collateral.gem.balance_of(our_address)
assert collateral_before < collateral_after
# Cleanup
set_collateral_price(mcd, collateral, Wad.from_number(230))
# TODO: Determine why frobbing the art away fails
# cleanup_urn(mcd, collateral, our_address)
cleanup_urn(mcd, collateral, other_address)
