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from __future__ import absolute_import
import pickle
from kombu.utils.functional import promise, maybe_promise
from kombu.tests.utils import TestCase
def double(x):
return x * 2
class test_promise(TestCase):
def test__str__(self):
self.assertEqual(str(promise(lambda: 'the quick brown fox')),
'the quick brown fox')
def test__repr__(self):
self.assertEqual(repr(promise(lambda: 'fi fa fo')),
"'fi fa fo'")
def test_evaluate(self):
self.assertEqual(promise(lambda: 2 + 2)(), 4)
self.assertEqual(promise(lambda x: x * 4, 2), 8)
self.assertEqual(promise(lambda x: x * 8, 2)(), 16)
def test_cmp(self):
self.assertEqual(promise(lambda: 10), promise(lambda: 10))
self.assertNotEqual(promise(lambda: 10), promise(lambda: 20))
def test__reduce__(self):
x = promise(double, 4)
y = pickle.loads(pickle.dumps(x))
self.assertEqual(x(), y())
def test__deepcopy__(self):
from copy import deepcopy
x = promise(double, 4)
y = deepcopy(x)
self.assertEqual(x._fun, y._fun)
self.assertEqual(x._args, y._args)
self.assertEqual(x(), y())
class test_maybe_promise(TestCase):
def test_evaluates(self):
self.assertEqual(maybe_promise(promise(lambda: 10)), 10)
self.assertEqual(maybe_promise(20), 20)
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