pythonnet/src/tests/test_subclass.py at master · sdpython/pythonnet · GitHub

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

# FIXME: This test module randomly passes/fails even if all tests are skipped.

# Something fishy is going on with the Test fixtures. Behavior seen on CI on

# both Linux and Windows

# TODO: Remove delay of class creations. Adding SetUp/TearDown may help

"""Test sub-classing managed types"""

import System

import pytest

from Python.Test import (IInterfaceTest, SubClassTest, EventArgsTest,

FunctionsTest)

from System.Collections.Generic import List

def interface_test_class_fixture(subnamespace):

"""Delay creation of class until test starts."""

class InterfaceTestClass(IInterfaceTest):

"""class that implements the test interface"""

__namespace__ = "Python.Test." + subnamespace

def foo(self):

return "InterfaceTestClass"

def bar(self, x, i):

return "/".join([x] * i)

return InterfaceTestClass

def derived_class_fixture(subnamespace):

"""Delay creation of class until test starts."""

class DerivedClass(SubClassTest):

"""class that derives from a class deriving from IInterfaceTest"""

__namespace__ = "Python.Test." + subnamespace

def foo(self):

return "DerivedClass"

def base_foo(self):

return SubClassTest.foo(self)

def super_foo(self):

return super(DerivedClass, self).foo()

def bar(self, x, i):

return "_".join([x] * i)

def return_list(self):

l = List[str]()

l.Add("A")

l.Add("B")

l.Add("C")

return l

return DerivedClass

def derived_event_test_class_fixture(subnamespace):

"""Delay creation of class until test starts."""

class DerivedEventTest(IInterfaceTest):

"""class that implements IInterfaceTest.TestEvent"""

__namespace__ = "Python.Test." + subnamespace

def __init__(self):

self.event_handlers = []

# event handling

def add_TestEvent(self, handler):

self.event_handlers.append(handler)

def remove_TestEvent(self, handler):

self.event_handlers.remove(handler)

def OnTestEvent(self, value):

args = EventArgsTest(value)

for handler in self.event_handlers:

handler(self, args)

return DerivedEventTest

def test_base_class():

"""Test base class managed type"""

ob = SubClassTest()

assert ob.foo() == "foo"

assert FunctionsTest.test_foo(ob) == "foo"

assert ob.bar("bar", 2) == "bar"

assert FunctionsTest.test_bar(ob, "bar", 2) == "bar"

assert ob.not_overriden() == "not_overriden"

assert list(ob.return_list()) == ["a", "b", "c"]

assert list(SubClassTest.test_list(ob)) == ["a", "b", "c"]

def test_interface():

"""Test python classes can derive from C# interfaces"""

InterfaceTestClass = interface_test_class_fixture(test_interface.__name__)

ob = InterfaceTestClass()

assert ob.foo() == "InterfaceTestClass"

assert FunctionsTest.test_foo(ob) == "InterfaceTestClass"

assert ob.bar("bar", 2) == "bar/bar"

assert FunctionsTest.test_bar(ob, "bar", 2) == "bar/bar"

# pass_through will convert from InterfaceTestClass -> IInterfaceTest,

# causing a new wrapper object to be created. Hence id will differ.

x = FunctionsTest.pass_through_interface(ob)

assert id(x) != id(ob)

def test_derived_class():

"""Test python class derived from managed type"""

DerivedClass = derived_class_fixture(test_derived_class.__name__)

ob = DerivedClass()

assert ob.foo() == "DerivedClass"

assert ob.base_foo() == "foo"

assert ob.super_foo() == "foo"

assert FunctionsTest.test_foo(ob) == "DerivedClass"

assert ob.bar("bar", 2) == "bar_bar"

assert FunctionsTest.test_bar(ob, "bar", 2) == "bar_bar"

assert ob.not_overriden() == "not_overriden"

assert list(ob.return_list()) == ["A", "B", "C"]

assert list(SubClassTest.test_list(ob)) == ["A", "B", "C"]

x = FunctionsTest.pass_through(ob)

assert id(x) == id(ob)

def test_derived_traceback():

"""Test python exception traceback in class derived from managed base"""

class DerivedClass(SubClassTest):

__namespace__ = "Python.Test.traceback"

def foo(self):

print (xyzname)

return None

import sys,traceback

ob = DerivedClass()

# direct call

try:

ob.foo()

assert False

except:

e = sys.exc_info()

assert "xyzname" in str(e[1])

location = traceback.extract_tb(e[2])[-1]

assert location[2] == "foo"

# call through managed code

try:

FunctionsTest.test_foo(ob)

assert False

except:

e = sys.exc_info()

assert "xyzname" in str(e[1])

location = traceback.extract_tb(e[2])[-1]

assert location[2] == "foo"

def test_create_instance():

"""Test derived instances can be created from managed code"""

DerivedClass = derived_class_fixture(test_create_instance.__name__)

ob = FunctionsTest.create_instance(DerivedClass)

assert ob.foo() == "DerivedClass"

assert FunctionsTest.test_foo(ob) == "DerivedClass"

assert ob.bar("bar", 2) == "bar_bar"

assert FunctionsTest.test_bar(ob, "bar", 2) == "bar_bar"

assert ob.not_overriden() == "not_overriden"

x = FunctionsTest.pass_through(ob)

assert id(x) == id(ob)

InterfaceTestClass = interface_test_class_fixture(test_create_instance.__name__)

ob2 = FunctionsTest.create_instance_interface(InterfaceTestClass)

assert ob2.foo() == "InterfaceTestClass"

assert FunctionsTest.test_foo(ob2) == "InterfaceTestClass"

assert ob2.bar("bar", 2) == "bar/bar"

assert FunctionsTest.test_bar(ob2, "bar", 2) == "bar/bar"

y = FunctionsTest.pass_through_interface(ob2)

assert id(y) != id(ob2)

def test_events():

class EventHandler(object):

def handler(self, x, args):

self.value = args.value

event_handler = EventHandler()

x = SubClassTest()

x.TestEvent += event_handler.handler

assert FunctionsTest.test_event(x, 1) == 1

assert event_handler.value == 1

InterfaceTestClass = interface_test_class_fixture(test_events.__name__)

i = InterfaceTestClass()

with pytest.raises(System.NotImplementedException):

FunctionsTest.test_event(i, 2)

DerivedEventTest = derived_event_test_class_fixture(test_events.__name__)

d = DerivedEventTest()

d.add_TestEvent(event_handler.handler)

assert FunctionsTest.test_event(d, 3) == 3

assert event_handler.value == 3

assert len(d.event_handlers) == 1

def test_isinstance_check():

a = [str(x) for x in range(0, 1000)]

b = [System.String(x) for x in a]

for x in a:

assert not isinstance(x, System.Object)

assert not isinstance(x, System.String)

for x in b:

assert isinstance(x, System.Object)

assert isinstance(x, System.String)

def test_namespace_and_init():

calls = []

class TestX(System.Object):

__namespace__ = "test_clr_subclass_with_init_args"

def __init__(self, *args, **kwargs):

calls.append((args, kwargs))

t = TestX(1,2,3,foo="bar")

assert len(calls) == 1

assert calls[0][0] == (1,2,3)

assert calls[0][1] == {"foo":"bar"}

def test_namespace_and_argless_init():

calls = []

class TestX(System.Object):

__namespace__ = "test_clr_subclass_without_init_args"

def __init__(self):

calls.append(True)

t = TestX()

assert len(calls) == 1

assert calls[0] == True

def test_namespace_and_no_init():

class TestX(System.Object):

__namespace__ = "test_clr_subclass_without_init"

q = 1

t = TestX()

assert t.q == 1

def test_construction_from_clr():

import clr

calls = []

class TestX(System.Object):

__namespace__ = "test_clr_subclass_init_from_clr"

@clr.clrmethod(None, [int, str])

def __init__(self, i, s):

calls.append((i, s))

# Construct a TestX from Python

t = TestX(1, "foo")

assert len(calls) == 1

assert calls[0][0] == 1

assert calls[0][1] == "foo"

# Reset calls and construct a TestX from CLR

calls = []

tp = t.GetType()

t2 = tp.GetConstructors()[0].Invoke(None)

assert len(calls) == 0

# The object has only been constructed, now it needs to be initialized as well

tp.GetMethod("__init__").Invoke(t2, [1, "foo"])

assert len(calls) == 1

assert calls[0][0] == 1

assert calls[0][1] == "foo"

pythonnet/src/tests/test_subclass.py at master · sdpython/pythonnet · GitHub

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