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test_delegate.py
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287 lines (192 loc) · 7.24 KB
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# -*- coding: utf-8 -*-
"""Test CLR delegate support."""
import Python.Test as Test
import System
import pytest
from Python.Test import DelegateTest, StringDelegate
from .utils import HelloClass, hello_func, MultipleHandler, DictProxyType
def test_delegate_standard_attrs():
"""Test standard delegate attributes."""
from Python.Test import PublicDelegate
assert PublicDelegate.__name__ == 'PublicDelegate'
assert PublicDelegate.__module__ == 'Python.Test'
assert isinstance(PublicDelegate.__dict__, DictProxyType)
assert PublicDelegate.__doc__ is None
def test_global_delegate_visibility():
"""Test visibility of module-level delegates."""
from Python.Test import PublicDelegate
assert PublicDelegate.__name__ == 'PublicDelegate'
assert Test.PublicDelegate.__name__ == 'PublicDelegate'
with pytest.raises(ImportError):
from Python.Test import InternalDelegate
_ = InternalDelegate
with pytest.raises(AttributeError):
_ = Test.InternalDelegate
def test_nested_delegate_visibility():
"""Test visibility of nested delegates."""
ob = DelegateTest.PublicDelegate
assert ob.__name__ == 'PublicDelegate'
ob = DelegateTest.ProtectedDelegate
assert ob.__name__ == 'ProtectedDelegate'
with pytest.raises(AttributeError):
_ = DelegateTest.InternalDelegate
with pytest.raises(AttributeError):
_ = DelegateTest.PrivateDelegate
def test_delegate_from_function():
"""Test delegate implemented with a Python function."""
d = StringDelegate(hello_func)
ob = DelegateTest()
assert ob.CallStringDelegate(d) == "hello"
assert d() == "hello"
ob.stringDelegate = d
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
def test_delegate_from_method():
"""Test delegate implemented with a Python instance method."""
inst = HelloClass()
d = StringDelegate(inst.hello)
ob = DelegateTest()
assert ob.CallStringDelegate(d) == "hello"
assert d() == "hello"
ob.stringDelegate = d
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
def test_delegate_from_unbound_method():
"""Test failure mode for unbound methods."""
with pytest.raises(TypeError):
d = StringDelegate(HelloClass.hello)
d()
def test_delegate_from_static_method():
"""Test delegate implemented with a Python static method."""
d = StringDelegate(HelloClass.s_hello)
ob = DelegateTest()
assert ob.CallStringDelegate(d) == "hello"
assert d() == "hello"
ob.stringDelegate = d
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
inst = HelloClass()
d = StringDelegate(inst.s_hello)
ob = DelegateTest()
assert ob.CallStringDelegate(d) == "hello"
assert d() == "hello"
ob.stringDelegate = d
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
def test_delegate_from_class_method():
"""Test delegate implemented with a Python class method."""
d = StringDelegate(HelloClass.c_hello)
ob = DelegateTest()
assert ob.CallStringDelegate(d) == "hello"
assert d() == "hello"
ob.stringDelegate = d
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
inst = HelloClass()
d = StringDelegate(inst.c_hello)
ob = DelegateTest()
assert ob.CallStringDelegate(d) == "hello"
assert d() == "hello"
ob.stringDelegate = d
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
def test_delegate_from_callable():
"""Test delegate implemented with a Python callable object."""
inst = HelloClass()
d = StringDelegate(inst)
ob = DelegateTest()
assert ob.CallStringDelegate(d) == "hello"
assert d() == "hello"
ob.stringDelegate = d
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
def test_delegate_from_managed_instance_method():
"""Test delegate implemented with a managed instance method."""
ob = DelegateTest()
d = StringDelegate(ob.SayHello)
assert ob.CallStringDelegate(d) == "hello"
assert d() == "hello"
ob.stringDelegate = d
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
def test_delegate_from_managed_static_method():
"""Test delegate implemented with a managed static method."""
d = StringDelegate(DelegateTest.StaticSayHello)
ob = DelegateTest()
assert ob.CallStringDelegate(d) == "hello"
assert d() == "hello"
ob.stringDelegate = d
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
def test_delegate_from_delegate():
"""Test delegate implemented with another delegate."""
d1 = StringDelegate(hello_func)
d2 = StringDelegate(d1)
ob = DelegateTest()
assert ob.CallStringDelegate(d2) == "hello"
assert d2() == "hello"
ob.stringDelegate = d2
assert ob.CallStringDelegate(ob.stringDelegate) == "hello"
assert ob.stringDelegate() == "hello"
def test_delegate_with_invalid_args():
"""Test delegate instantiation with invalid (non-callable) args."""
with pytest.raises(TypeError):
_ = StringDelegate(None)
with pytest.raises(TypeError):
_ = StringDelegate("spam")
with pytest.raises(TypeError):
_ = StringDelegate(1)
def test_multicast_delegate():
"""Test multicast delegates."""
inst = MultipleHandler()
d1 = StringDelegate(inst.count)
d2 = StringDelegate(inst.count)
md = System.Delegate.Combine(d1, d2)
ob = DelegateTest()
assert ob.CallStringDelegate(md) == "ok"
assert inst.value == 2
assert md() == "ok"
assert inst.value == 4
def test_subclass_delegate_fails():
"""Test that subclassing of a delegate type fails."""
from Python.Test import PublicDelegate
with pytest.raises(TypeError):
class Boom(PublicDelegate):
pass
_ = Boom
def test_delegate_equality():
"""Test delegate equality."""
d = StringDelegate(hello_func)
ob = DelegateTest()
ob.stringDelegate = d
assert ob.stringDelegate == d
def test_bool_delegate():
"""Test boolean delegate."""
from Python.Test import BoolDelegate
def always_so_negative():
return 0
d = BoolDelegate(always_so_negative)
ob = DelegateTest()
ob.CallBoolDelegate(d)
assert not d()
assert not ob.CallBoolDelegate(d)
def test_object_delegate():
"""Test object delegate."""
from Python.Test import ObjectDelegate
def create_object():
return DelegateTest()
d = ObjectDelegate(create_object)
ob = DelegateTest()
ob.CallObjectDelegate(d)
def test_invalid_object_delegate():
"""Test invalid object delegate with mismatched return type."""
from Python.Test import ObjectDelegate
d = ObjectDelegate(hello_func)
ob = DelegateTest()
with pytest.raises(TypeError):
ob.CallObjectDelegate(d)
# test async delegates
# test multicast delegates
# test explicit op_
# test sig mismatch, both on managed and Python side
# test return wrong type