def test_evaluation_works(self):
random.seed("satisfaction 1")
values = set()
for depth in xrange(10):
for _ in xrange(10):
formula = random_formula(depth)
a = random_assignment(formula)
x = formula.evaluate(a)
values.add(x)
self.assertIn(x, (True, False))
symbol = random.choice(list(a))
del a[symbol]
self.assertRaises(UnassignedSymbol, formula.evaluate, a)
if depth == 0:
break
self.assertEqual(len(values), 2)
def brute_t3st_transformation(self, transformer, checker=None,
implies=False):
for depth in xrange(4):
for _ in xrange(10):
formula = random_formula(depth)
transformed = transformer(formula)
if checker is not None:
self.assertTrue(checker(transformed))
for _ in xrange(1000):
a = random_assignment(transformed)
x = formula.evaluate(a)
y = transformed.evaluate(a)
if implies:
self.assertTrue(not y or x)
else:
self.assertEqual(x, y)
if depth == 0:
break
