def test_addition(self):
rules1 = rules(
(gt(0), 'positive'),
(lt(0), 'negative'),
)
rules2 = rules((eq(0), 'zero'), )
these_rules = rules1 + rules2
self.assertEqual(len(these_rules), 3)
self.assertEqual(decide(these_rules, 0), 'zero')
def test_addition(self):
rules1 = rules(
(gt(0), 'positive'),
(lt(0), 'negative'),
)
rules2 = rules(
(eq(0), 'zero'),
)
these_rules = rules1 + rules2
self.assertEqual(len(these_rules), 3)
self.assertEqual(decide(these_rules, 0), 'zero')
def test_partial_application(self):
positivity = decide(self.positivity_rules)
self.assertIsInstance(positivity, collections.Callable)
value = positivity(10)
self.assertEqual(value, 'positive')
def test_non_rules_objects_as_rules(self):
with self.assertRaises(TypeError):
decide(['something', 'whatever'], 20)
def test_no_matching_rules(self):
with self.assertRaises(NoMatchingRule):
decide(self.positivity_rules, 0)
def test_nested_rules(self):
value = decide(self.type_rules, 0)
self.assertEqual(value, 'zero')
def test_flat_rules(self):
value = decide(self.positivity_rules, -10)
self.assertEqual(value, 'negative')
