pythonnet/tests/test_dynamic.py at v3.2.0-rc2 · pythonnet/pythonnet · GitHub

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# -*- coding: utf-8 -*-

import pytest

from System.Collections.Generic import Dictionary

from System.Dynamic import ExpandoObject

from Python.Test import DynamicMappingObject

from Python.Test import RejectingDeleteDynamicObject

from Python.Test import RejectingSetDynamicObject

from Python.Test import ThrowingDeleteDynamicObject

from Python.Test import ThrowingGetDynamicObject

from Python.Test import ThrowingSetDynamicObject

def _mro_names(obj):

return [f"{t.__module__}.{t.__name__}" for t in type(obj).__mro__]

@pytest.mark.parametrize(

"obj, expected",

[

(DynamicMappingObject(), True),

(ExpandoObject(), True),

(Dictionary[str, int](), False),

)

def test_dlr_mixin_presence(obj, expected):

has_mixin = "clr._extras.dlr.DynamicMetaObjectProviderMixin" in _mro_names(obj)

assert has_mixin is expected

@pytest.mark.parametrize("obj", [DynamicMappingObject(), ExpandoObject()])

def test_dynamic_binder(obj):

assert "answer" not in dir(obj)

assert "wrong_answer" not in dir(obj)

setattr(obj, "answer", 42)

obj.wrong_answer = 54

assert obj.answer == 42

assert obj.wrong_answer == 54

assert "answer" in dir(obj)

assert "wrong_answer" in dir(obj)

def test_native_members_are_accessible_and_keep_priority():

obj = DynamicMappingObject()

setattr(obj, "answer", 42)

obj.SetDynamicValue("Multiplier", 999)

# Native field

assert obj.Label == "default"

obj.Label = "changed"

assert obj.Label == "changed"

# Native property takes precedence over dynamic fallback

assert obj.Multiplier == 1

obj.Multiplier = 7

assert obj.Multiplier == 7

# Native method

obj.Multiplier = 3

assert obj.Multiply(5) == 15

def test_dynamic_and_native_members_coexist():

obj = DynamicMappingObject()

setattr(obj, "answer", 42)

obj.Multiplier = 2

assert obj.answer == 42

assert obj.Multiplier == 2

assert obj.Multiply(10) == 20

@pytest.mark.parametrize("obj", [DynamicMappingObject(), ExpandoObject()])

def test_set_and_get_dynamic_property(obj):

"""Test that setting and getting dynamic properties goes through DLR binder."""

# Get initial value (should be None for non-existent property)

assert not hasattr(obj, "MyProp")

# Set a dynamic property to a value

obj.MyProp = 42

assert obj.MyProp == 42

# Set to None and verify it stays None through DLR

obj.MyProp = None

assert obj.MyProp is None

# Set to another value and verify

obj.MyProp = "hello"

assert obj.MyProp == "hello"

def test_update_dynamic_value():

"""Dynamic-only members should use DLR get/set/modify/delete end-to-end."""

obj = DynamicMappingObject()

assert not hasattr(obj, "DynamicOnly")

# Initial set should create a dynamic member

obj.DynamicOnly = "initial"

assert obj.DynamicOnly == "initial"

# Modify flows through TrySetMember

obj.DynamicOnly = "updated"

assert obj.DynamicOnly == "updated"

# Setting None keeps a present member with None value

obj.DynamicOnly = None

assert obj.DynamicOnly is None

# Delete flows through TryDeleteMember

del obj.DynamicOnly

assert "DynamicOnly" not in dir(obj)

assert not hasattr(obj, "DynamicOnly")

def test_dynamic_set_none_updates_managed_store_after_get():

"""Regression: get->set(None)->get must route through DLR and update managed storage."""

obj = DynamicMappingObject()

obj.SetDynamicValue("MyProp", "initial")

x = obj.MyProp

assert x == "initial"

obj.MyProp = None

y = obj.MyProp

assert y is None

assert obj.GetDynamicValue("MyProp") is None

@pytest.mark.parametrize("obj", [DynamicMappingObject(), ExpandoObject()])

def test_dynamic_member_lifecycle(obj):

"""Dynamic members should support set/modify/get/delete via the DLR binder."""

name = "LifecycleMember"

assert not hasattr(obj, name)

setattr(obj, name, 1)

assert getattr(obj, name) == 1

setattr(obj, name, 2)

assert getattr(obj, name) == 2

delattr(obj, name)

assert not hasattr(obj, name)

def test_derive_from_dynamic_class():

class MyMappingObject(DynamicMappingObject):

__namespace__ = "PythonNetTest"

def __init__(self):

self._custom = 0

@property

def custom_property(self):

return self._custom

@custom_property.setter

def custom_property(self, i):

self._custom += i

obj = MyMappingObject()

with pytest.raises(AttributeError):

x = obj.unknown_property

assert obj.custom_property == 0

obj.custom_property = 5

assert obj.custom_property == 5

obj.custom_property = 5

assert obj.custom_property == 10

obj.other_property = None

assert obj.other_property is None

def test_trysetmember_false_raises_attributeerror_instead_of_silent_python_setattr():

obj = RejectingSetDynamicObject()

with pytest.raises(AttributeError):

obj.typoed_name = 42

assert not hasattr(obj, "typoed_name")

def test_trygetmember_exception_is_raised_in_python():

obj = ThrowingGetDynamicObject()

obj.AddDynamicMember("any_key", 1)

with pytest.raises(Exception, match="TryGetMember failed for 'any_key'"):

_ = obj.any_key

def test_trysetmember_exception_is_raised_in_python():

obj = ThrowingSetDynamicObject()

with pytest.raises(Exception, match="TrySetMember failed for 'bad_name'"):

obj.bad_name = 42

def test_trydeletemember_false_raises_attributeerror():

obj = RejectingDeleteDynamicObject()

obj.AddDynamicMember("existing_name", 42)

with pytest.raises(AttributeError):

del obj.missing_name

def test_trydeletemember_exception_is_raised_in_python():

obj = ThrowingDeleteDynamicObject()

obj.bad_name = 42

with pytest.raises(Exception, match="TryDeleteMember failed for 'bad_name'"):

del obj.bad_name

pythonnet/tests/test_dynamic.py at v3.2.0-rc2 · pythonnet/pythonnet · GitHub

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