def test_constrained_instance_override():
def make_checker(*ok_values):
def is_valid(element, value):
assert isinstance(element, Constrained)
return value in ok_values
return is_valid
el = Constrained(valid_value=make_checker(u'a'))
assert el.set(u'a')
assert el.value == u'a'
assert el.u == u'a'
assert not el.set(u'b')
assert el.value is None
assert el.u == u'b'
el = Constrained(child_type=Integer, valid_value=make_checker(1, 2))
assert el.set(u'1')
assert el.value == 1
assert el.u == u'1'
assert el.set(u'2')
assert el.value == 2
assert el.u == u'2'
for invalid in u'3', u'x':
assert not el.set(invalid)
assert el.value == None
assert el.u == invalid
def test_constrained_instance_override():
def make_checker(*ok_values):
def is_valid(element, value):
assert isinstance(element, Constrained)
return value in ok_values
return is_valid
el = Constrained(valid_value=make_checker(u'a'))
assert el.set(u'a')
assert el.value == u'a'
assert el.u == u'a'
assert not el.set(u'b')
assert el.value is None
assert el.u == u'b'
el = Constrained(child_type=Integer, valid_value=make_checker(1, 2))
assert el.set(u'1')
assert el.value == 1
assert el.u == u'1'
assert el.set(u'2')
assert el.value == 2
assert el.u == u'2'
for invalid in u'3', u'x':
assert not el.set(invalid)
assert el.value == None
assert el.u == invalid
def test_constrained_instance_contrived():
# check that fringe types that adapt as None can used in bounds
class CustomInteger(Integer):
def adapt(self, value):
try:
return Integer.adapt(self, value)
except:
return None
el = Constrained(child_type=CustomInteger,
valid_value=lambda e, v: v in (1, None))
assert el.set(u'1')
for out_of_bounds in u'2', u'3':
assert not el.set(out_of_bounds)
for invalid in u'x', u'':
assert el.set(invalid)
assert el.value is None
assert el.u == u''
def test_constrained_instance_contrived():
# check that fringe types that adapt as None can used in bounds
class CustomInteger(Integer):
def adapt(self, value):
try:
return Integer.adapt(self, value)
except:
return None
el = Constrained(child_type=CustomInteger,
valid_value=lambda e, v: v in (1, None))
assert el.set(u'1')
for out_of_bounds in u'2', u'3':
assert not el.set(out_of_bounds)
for invalid in u'x', u'':
assert el.set(invalid)
assert el.value is None
assert el.u == u''
def test_constrained_no_default_validity():
el = Constrained(u'anything')
assert el.value is None
assert el.u == u'anything'
