def test_revenuebeforelastTrade():
t = Trades()
t.sell(Trade(0.0, -1, "S", 1.0))
t.sell(Trade(1.0, -1, "S", 1.0))
assert -1.0 == t.revenue(0.1)
def test_buyOnesellOne_sameDate():
t = Trades()
t.buy(Trade(0.0, 1, "S", 1.0))
t.sell(Trade(0.0, -1, "S", 1.0))
assert 0.0 == t.expense(1) + t.revenue(1)
def test_sellTwodifferent_revenueminusTwo():
t = Trades()
t.sell(Trade(0.0, -1, "S", 1.0))
t.sell(Trade(0.0, -1, "D", 1.0))
assert -2.0 == t.revenue(1)
def test_buyOneSellOne_revenueIsminusOne():
t = Trades()
t.buy(Trade(0.0, 1, "S", 1.0))
t.sell(Trade(1.0, -1, "S", 1.0))
assert -1.0 == t.revenue(2)