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test_delegate.py
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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)
def test_out_int_delegate():
"""Test delegate with an out int parameter."""
from Python.Test import OutIntDelegate
value = 7
def out_hello_func(ignored):
return 5
d = OutIntDelegate(out_hello_func)
result = d(value)
assert result == 5
ob = DelegateTest()
result = ob.CallOutIntDelegate(d, value)
assert result == 5
def invalid_handler(ignored):
return '5'
d = OutIntDelegate(invalid_handler)
with pytest.raises(TypeError):
result = d(value)
def test_out_string_delegate():
"""Test delegate with an out string parameter."""
from Python.Test import OutStringDelegate
value = 'goodbye'
def out_hello_func(ignored):
return 'hello'
d = OutStringDelegate(out_hello_func)
result = d(value)
assert result == 'hello'
ob = DelegateTest()
result = ob.CallOutStringDelegate(d, value)
assert result == 'hello'
def test_ref_int_delegate():
"""Test delegate with a ref string parameter."""
from Python.Test import RefIntDelegate
value = 7
def ref_hello_func(data):
assert data == value
return data + 1
d = RefIntDelegate(ref_hello_func)
result = d(value)
assert result == value + 1
ob = DelegateTest()
result = ob.CallRefIntDelegate(d, value)
assert result == value + 1
def test_ref_string_delegate():
"""Test delegate with a ref string parameter."""
from Python.Test import RefStringDelegate
value = 'goodbye'
def ref_hello_func(data):
assert data == value
return 'hello'
d = RefStringDelegate(ref_hello_func)
result = d(value)
assert result == 'hello'
ob = DelegateTest()
result = ob.CallRefStringDelegate(d, value)
assert result == 'hello'
def test_ref_int_ref_string_delegate():
"""Test delegate with a ref int and ref string parameter."""
from Python.Test import RefIntRefStringDelegate
intData = 7
stringData = 'goodbye'
def ref_hello_func(intValue, stringValue):
assert intData == intValue
assert stringData == stringValue
return (intValue + 1, stringValue + '!')
d = RefIntRefStringDelegate(ref_hello_func)
result = d(intData, stringData)
assert result == (intData + 1, stringData + '!')
ob = DelegateTest()
result = ob.CallRefIntRefStringDelegate(d, intData, stringData)
assert result == (intData + 1, stringData + '!')
def not_a_tuple(intValue, stringValue):
return 'a'
d = RefIntRefStringDelegate(not_a_tuple)
with pytest.raises(TypeError):
result = d(intData, stringData)
def short_tuple(intValue, stringValue):
return (5,)
d = RefIntRefStringDelegate(short_tuple)
with pytest.raises(TypeError):
result = d(intData, stringData)
def long_tuple(intValue, stringValue):
return (5, 'a', 'b')
d = RefIntRefStringDelegate(long_tuple)
with pytest.raises(TypeError):
result = d(intData, stringData)
def wrong_tuple_item(intValue, stringValue):
return ('a', 'b')
d = RefIntRefStringDelegate(wrong_tuple_item)
with pytest.raises(TypeError):
result = d(intData, stringData)
def test_int_ref_int_ref_string_delegate():
"""Test delegate with a ref int and ref string parameter."""
from Python.Test import IntRefIntRefStringDelegate
intData = 7
stringData = 'goodbye'
def ref_hello_func(intValue, stringValue):
assert intData == intValue
assert stringData == stringValue
return (intValue + len(stringValue), intValue + 1, stringValue + '!')
d = IntRefIntRefStringDelegate(ref_hello_func)
result = d(intData, stringData)
assert result == (intData + len(stringData), intData + 1, stringData + '!')
ob = DelegateTest()
result = ob.CallIntRefIntRefStringDelegate(d, intData, stringData)
assert result == (intData + len(stringData), intData + 1, stringData + '!')
def not_a_tuple(intValue, stringValue):
return 'a'
d = IntRefIntRefStringDelegate(not_a_tuple)
with pytest.raises(TypeError):
result = d(intData, stringData)
def short_tuple(intValue, stringValue):
return (5,)
d = IntRefIntRefStringDelegate(short_tuple)
with pytest.raises(TypeError):
result = d(intData, stringData)
def wrong_return_type(intValue, stringValue):
return ('a', 7, 'b')
d = IntRefIntRefStringDelegate(wrong_return_type)
with pytest.raises(TypeError):
result = d(intData, stringData)
# test async delegates
# test multicast delegates
# test explicit op_
# test sig mismatch, both on managed and Python side
# test return wrong type