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"""
Unit tests for checking the API defended to create custom Parameters.
"""
import param
import pytest
from .utils import check_defaults
@pytest.fixture
def custom_parameter():
class CustomParameter(param.Parameter):
def __init__(self, default='custom', **params):
super().__init__(default=default, **params)
return CustomParameter
@pytest.fixture
def custom_parameter_with_slot():
class CustomParameter(param.Parameter):
__slots__ = ['foo', 'bar']
def __init__(self, default='custom', foo=True, bar=None, **params):
super().__init__(default=default, **params)
self.foo = foo
self.bar = bar
return CustomParameter
def _check_simple_defaults(param):
assert param.default == 'custom'
assert param.allow_None is False
def _check_slot_defaults(param):
assert param.default == 'custom'
assert param.allow_None is False
assert param.foo is True
assert param.bar is None
def test_customparam_defaults_unbound(custom_parameter):
c = custom_parameter()
check_defaults(c, label=None)
_check_simple_defaults(c)
def test_customparam_defaults_class(custom_parameter):
class P(param.Parameterized):
c = custom_parameter()
check_defaults(P.param.c, label='C')
_check_simple_defaults(P.param.c)
def test_customparam_defaults_inst(custom_parameter):
class P(param.Parameterized):
c = custom_parameter()
p = P()
check_defaults(p.param.c, label='C')
_check_simple_defaults(p.param.c)
def test_customparam_slot_defaults_unbound(custom_parameter_with_slot):
c = custom_parameter_with_slot()
check_defaults(c, label=None)
_check_slot_defaults(c)
def test_customparam_slot_defaults_class(custom_parameter_with_slot):
class P(param.Parameterized):
c = custom_parameter_with_slot()
check_defaults(P.param.c, label='C')
_check_slot_defaults(P.param.c)
def test_customparam_slot_defaults_inst(custom_parameter_with_slot):
class P(param.Parameterized):
c = custom_parameter_with_slot()
p = P()
check_defaults(p.param.c, label='C')
_check_slot_defaults(p.param.c)
def test_customparam_inheritance(custom_parameter_with_slot):
class A(param.Parameterized):
c = param.Parameter(doc='foo')
class B(A):
c = custom_parameter_with_slot()
assert B.param.c.doc == 'foo'
assert B().param.c.doc == 'foo'
def test_customparam_inheritance_override(custom_parameter_with_slot):
class A(param.Parameterized):
c = param.Parameter(doc='foo')
class B(A):
c = custom_parameter_with_slot(doc='bar')
assert B.param.c.doc == 'bar'
assert B().param.c.doc == 'bar'
def test_inheritance_parameter_attribute_without_default():
class CustomParameter(param.Parameter):
__slots__ = ['foo']
# foo has no default value defined in _slot_defaults
def __init__(self, foo=param.Undefined, **params):
super().__init__(**params)
# To trigger Parameter.__getattribute__
self.foo = foo
if self.foo == 'bar':
pass
with pytest.raises(
KeyError,
match="Slot 'foo' on unbound parameter 'CustomParameter' has no default value defined in `_slot_defaults`"
):
CustomParameter()
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