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'''
TestFacade
==========
Tested platforms:
* Android
* iOS
* Windows
* MacOS
* Linux
'''
import unittest
import sys
from types import MethodType
from unittest.mock import Mock, patch
import plyer
def mock_platform_module(mod, platform, cls):
'''
Create a stub module for a specific platform. This module contains:
* class inheriting from facade implementing the desired feature
* 'instance' function returning an instance of the implementing class
'''
# assemble an instance returned from the instance() function
# which is created from a dynamically created class
# <class '<mod>.<platform><cls>'> e.g.:
# <class 'plyer.platforms.win.dummy . WinDummy'>
stub_inst = Mock(
__module__=mod,
__class__=type(
'{}{}'.format(platform.title(), cls), (object, ), {
'__module__': mod
}
),
)
# manual 'return_value' assign to Mock, so that the instance() call
# can return stub_inst's own instance instead of creating another
# unnecessary Mock object
stub_inst.return_value = stub_inst
# bind custom function returning the class name to stub_inst instance,
# so that instance().show() call requires 'self' i.e. instance parameter
# for the function to access the instance's class name
stub_inst.show = MethodType(lambda slf: slf, stub_inst)
stub_mod = Mock(instance=stub_inst)
return stub_mod
# dummy pyjnius class to silence the import + config
class DummyJnius:
'''
Mocked PyJNIus module.
'''
def __init__(self, *args, **kwargs):
class JavaClass:
'''
Mocked PyJNIus JavaClass object.
'''
def __init__(self):
self.ANDROID_VERSION = None
self.SDK_INT = 1
self.mActivity = None
self.autoclass = lambda *a, **kw: JavaClass()
class TestFacade(unittest.TestCase):
'''
TestCase for plyer.utils.Proxy and plyer.facades.
'''
def test_facade_existing_platforms(self):
'''
Test for returning an object for Android API implementation
from Proxy object using a dynamically generated dummy objects.
'''
_original = plyer.utils.platform
for plat in {'android', 'ios', 'win', 'macosx', 'linux'}:
plyer.utils.platform = plat
if plat == 'android':
# android platform automatically imports jnius
sys.modules['jnius'] = DummyJnius()
# create stub module with instance func and class
stub_mod = mock_platform_module(
mod='plyer.platforms.{}.dummy'.format(plat),
platform=plyer.utils.platform,
cls='Dummy'
)
proxy_cls = plyer.utils.Proxy
target = 'builtins.__import__'
with patch(target=target, return_value=stub_mod):
dummy = proxy_cls('dummy', stub_mod)
self.assertEqual(
str(dummy.__class__).split("'")[1],
'plyer.platforms.{}.dummy.{}Dummy'.format(
plat, plat.title()
)
)
self.assertEqual(
str(dummy.show().__class__).split("'")[1],
'plyer.platforms.{}.dummy.{}Dummy'.format(
plat, plat.title()
)
)
plyer.utils.platform = _original
def test_facade_unknown(self):
'''
Test fallback of Proxy to facade if there
is no such requested platform.
'''
_original = plyer.utils.platform
plyer.utils.platform = 'unknown'
# no 'unknown' platform (folder), fallback to facade
class MockedProxy(plyer.utils.Proxy):
'''
Partially mocked Proxy class, so that we pull the error
from traceback.print_exc to the test and check the calls.
'''
# _ensure_obj is called only once, to either
# get the platform object or fall back to facade
# therefore the three self.asserts below will return
# different values
expected_asserts = [True, False, False]
def _ensure_obj(inst):
# called once, prints to stderr
# mock stderr because traceback.print_exc uses it
# https://github.com/python/cpython/blob/
# 16dfca4d829e45f36e71bf43f83226659ce49315/Lib/traceback.py#L99
sys.stderr = Mock()
# call the original function to trigger
# ImportError warnings in stderr
super(MockedProxy, inst)._ensure_obj()
# Traceback (most recent call last):
# File "/app/plyer/utils.py", line 88, in _ensure_obj
# mod = __import__(module, fromlist='.')
# ImportError: No module named unknown.dummy
# must not use self.assertX
# (has to be checked on the go!)
expected_bool = MockedProxy.expected_asserts.pop(0)
call_count = sys.stderr.write.call_count
assert (call_count == 6) == expected_bool, call_count
# return stderr to the original state
sys.stderr = sys.__stderr__
proxy_cls = MockedProxy
facade = Mock()
dummy = proxy_cls('dummy', facade)
self.assertEqual(dummy._mock_new_parent, facade)
plyer.utils.platform = _original
if __name__ == '__main__':
unittest.main()
|
