def test_create_option(self):
self.assertIsInstance(option.Option("A"), option.Full)
self.assertIsInstance(option.Option(10), option.Full)
self.assertIsInstance(option.Option(10, lambda x: x > 7), option.Full)
self.assertIsInstance(option.Option(None), option.Empty)
self.assertIsInstance(option.Option(False), option.Full)
self.assertIsInstance(option.Option(0), option.Full)
self.assertIsInstance(option.Option(False, checker=bool), option.Empty)
self.assertIsInstance(option.Option(0, checker=bool), option.Empty)
self.assertIsInstance(option.Option(10, lambda x: x > 70),
option.Empty)
def test_lazy_orcall(self):
def from_mimetype(request):
# you can return both value or Option
return request.get("mimetype", None)
def from_extension(request):
# you can return both value or Option
return option.Option(request.get("url", None))\
.map(lambda s: s.split(".")[-1])
# extract value from extension
r = dict(url="myfile.png")
self.assertEqual(
"PNG",
option.Option(r.get("type", None)).or_call(
from_mimetype,
r).or_call(from_extension,
r).map(operator.methodcaller("upper")).get_or(""))
# extract value from mimetype
r = dict(url="myfile.svg", mimetype="png")
self.assertEqual(
"PNG",
option.Option(r.get("type", None)).or_call(
from_mimetype,
r).or_call(from_extension,
r).map(operator.methodcaller("upper")).get_or(""))
# type is set directly
r = dict(url="myfile.jpeg", mimetype="svg", type="png")
self.assertEqual(
"PNG",
option.Option(r.get("type", None)).or_call(
from_mimetype,
r).or_call(from_extension,
r).map(operator.methodcaller("upper")).get_or(""))
def from_extension(request):
# you can return both value or Option
return option.Option(request.get("url", None))\
.map(lambda s: s.split(".")[-1])
def test_empty_check(self):
self.assertTrue(option.Empty().empty)
self.assertTrue(option.Option(None).empty)
self.assertTrue(option.Option.from_call(lambda: None).empty)
self.assertFalse(option.Option(10).empty)
self.assertFalse(option.Full(10).empty)
def parameter(self, name):
return option.Option(self.get(name, None))
def test_option_repr(self):
self.assertEqual("Full(10)", repr(option.Full(10)))
self.assertEqual("Full(in box!)", repr(option.Full("in box!")))
self.assertEqual("Empty()", repr(option.Empty()))
self.assertEqual("Empty()", repr(option.Option(None)))
def test_stringify(self):
self.assertEqual("Full(10)", str(option.Full(10)))
self.assertEqual("Full(in box!)", str(option.Full("in box!")))
self.assertEqual("Empty()", str(option.Empty()))
self.assertEqual("Empty()", str(option.Option(None)))