def test_8(self):
project, i = Project(1000, 500, 300, 10), EfInt(0.6)
x, y = project.cash_flows, link(
(project.cash_flows, project.cash_flows))
self.assertAlmostEqual(aw(x, i), aw(y, i))
def test_3(self):
i = EfInt(0.05)
aw_cr = aw(Project(300000, 14000, 0, 20).cash_flows, i)
aw_ed = aw(Project(220000, 21000, 0, 20).cash_flows, i) + aw(
(CashFlow(8, 35000), ), i)
self.assertAlmostEqual(aw_cr, 38072.77615720737)
self.assertAlmostEqual(aw_ed, 42318.6326589209)
def test_2(self):
cr = tuple(Project(300000, 14000, 0, 20).cash_flows)
ed = tuple(Project(220000, 21000, 0, 20).cash_flows) + (CashFlow(
8, 35000), CashFlow(16, 35000))
i = EfInt(0.05)
self.assertAlmostEqual(pw(cr, i), 474470.94479555974)
self.assertAlmostEqual(pw(ed, i), 521429.6981340426)
self.assertAlmostEqual(aw(cr, i), 38072.77615720737)
self.assertAlmostEqual(aw(ed, i), 41840.86801633675)
self.assertLess(pw(cr, i), pw(ed, i))
self.assertLess(aw(cr, i), aw(ed, i))
def test_projects(self):
self.assertAlmostEqual(
pw(Project(-20000, 4000 - 1000, 4000, 10).cash_flows, EfInt(0.05)),
5620.857801717468)
self.assertAlmostEqual(
aw(Project(-20000, 4000 - 1000, 4000, 10).cash_flows, EfInt(0.05)),
727.9268005526942)
def test_5(self):
i = EfInt(0.07)
sa = aw(
chain((CashFlow(0, 5e6), ),
repeated(Project(0, 2e5, 1e6, 6).cash_flows, 25)), i, 25)
sb = aw(
chain((CashFlow(0, 6e6), ),
repeated(Project(0, 1.5e5, 1.1e6, 11).cash_flows, 25)), i,
25)
ba = aw(
chain((CashFlow(0, 5e6), ),
repeated(Project(0, 5e5 - 3e5, 1e6, 14).cash_flows, 25)), i,
25)
bb = aw(
chain((CashFlow(0, 3e6), ),
repeated(Project(0, 3e5, 6e5, 5).cash_flows, 25)), i, 25)
self.assertAlmostEqual(sa, 766638.1419621999)
self.assertAlmostEqual(sb, 731013.277560719)
self.assertAlmostEqual(ba, 662331.3841421161)
self.assertAlmostEqual(bb, 661765.9683268208)
self.assertAlmostEqual(min(sa + ba, sa + bb, sb + ba, sb + bb),
sb + bb)