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437 lines
12 KiB
Python
437 lines
12 KiB
Python
from functools import update_wrapper, wraps
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from unittest import TestCase
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from django.contrib.admin.views.decorators import staff_member_required
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from django.contrib.auth.decorators import (
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login_required,
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permission_required,
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user_passes_test,
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)
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from django.http import HttpResponse
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from django.test import SimpleTestCase
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from django.utils.decorators import method_decorator
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from django.utils.functional import keep_lazy, keep_lazy_text, lazy
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from django.utils.safestring import mark_safe
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from django.views.decorators.cache import cache_control, cache_page, never_cache
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from django.views.decorators.http import (
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condition,
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require_GET,
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require_http_methods,
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require_POST,
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require_safe,
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)
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from django.views.decorators.vary import vary_on_cookie, vary_on_headers
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def fully_decorated(request):
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"""Expected __doc__"""
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return HttpResponse("<html><body>dummy</body></html>")
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fully_decorated.anything = "Expected __dict__"
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def compose(*functions):
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# compose(f, g)(*args, **kwargs) == f(g(*args, **kwargs))
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functions = list(reversed(functions))
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def _inner(*args, **kwargs):
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result = functions[0](*args, **kwargs)
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for f in functions[1:]:
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result = f(result)
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return result
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return _inner
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full_decorator = compose(
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# django.views.decorators.http
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require_http_methods(["GET"]),
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require_GET,
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require_POST,
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require_safe,
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condition(lambda r: None, lambda r: None),
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# django.views.decorators.vary
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vary_on_headers("Accept-language"),
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vary_on_cookie,
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# django.views.decorators.cache
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cache_page(60 * 15),
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cache_control(private=True),
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never_cache,
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# django.contrib.auth.decorators
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# Apply user_passes_test twice to check #9474
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user_passes_test(lambda u: True),
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login_required,
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permission_required("change_world"),
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# django.contrib.admin.views.decorators
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staff_member_required,
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# django.utils.functional
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keep_lazy(HttpResponse),
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keep_lazy_text,
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lazy,
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# django.utils.safestring
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mark_safe,
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)
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fully_decorated = full_decorator(fully_decorated)
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class DecoratorsTest(TestCase):
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def test_attributes(self):
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"""
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Built-in decorators set certain attributes of the wrapped function.
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"""
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self.assertEqual(fully_decorated.__name__, "fully_decorated")
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self.assertEqual(fully_decorated.__doc__, "Expected __doc__")
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self.assertEqual(fully_decorated.__dict__["anything"], "Expected __dict__")
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def test_user_passes_test_composition(self):
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"""
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The user_passes_test decorator can be applied multiple times (#9474).
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"""
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def test1(user):
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user.decorators_applied.append("test1")
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return True
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def test2(user):
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user.decorators_applied.append("test2")
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return True
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def callback(request):
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return request.user.decorators_applied
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callback = user_passes_test(test1)(callback)
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callback = user_passes_test(test2)(callback)
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class DummyUser:
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pass
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class DummyRequest:
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pass
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request = DummyRequest()
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request.user = DummyUser()
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request.user.decorators_applied = []
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response = callback(request)
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self.assertEqual(response, ["test2", "test1"])
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# For testing method_decorator, a decorator that assumes a single argument.
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# We will get type arguments if there is a mismatch in the number of arguments.
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def simple_dec(func):
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@wraps(func)
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def wrapper(arg):
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return func("test:" + arg)
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return wrapper
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simple_dec_m = method_decorator(simple_dec)
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# For testing method_decorator, two decorators that add an attribute to the function
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def myattr_dec(func):
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def wrapper(*args, **kwargs):
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return func(*args, **kwargs)
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wrapper.myattr = True
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return wrapper
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myattr_dec_m = method_decorator(myattr_dec)
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def myattr2_dec(func):
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def wrapper(*args, **kwargs):
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return func(*args, **kwargs)
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wrapper.myattr2 = True
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return wrapper
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myattr2_dec_m = method_decorator(myattr2_dec)
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class ClsDec:
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def __init__(self, myattr):
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self.myattr = myattr
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def __call__(self, f):
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def wrapper():
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return f() and self.myattr
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return update_wrapper(wrapper, f)
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class MethodDecoratorTests(SimpleTestCase):
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"""
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Tests for method_decorator
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"""
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def test_preserve_signature(self):
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class Test:
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@simple_dec_m
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def say(self, arg):
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return arg
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self.assertEqual("test:hello", Test().say("hello"))
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def test_preserve_attributes(self):
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# Sanity check myattr_dec and myattr2_dec
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@myattr_dec
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def func():
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pass
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self.assertIs(getattr(func, "myattr", False), True)
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@myattr2_dec
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def func():
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pass
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self.assertIs(getattr(func, "myattr2", False), True)
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@myattr_dec
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@myattr2_dec
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def func():
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pass
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self.assertIs(getattr(func, "myattr", False), True)
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self.assertIs(getattr(func, "myattr2", False), False)
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# Decorate using method_decorator() on the method.
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class TestPlain:
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@myattr_dec_m
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@myattr2_dec_m
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def method(self):
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"A method"
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pass
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# Decorate using method_decorator() on both the class and the method.
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# The decorators applied to the methods are applied before the ones
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# applied to the class.
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@method_decorator(myattr_dec_m, "method")
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class TestMethodAndClass:
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@method_decorator(myattr2_dec_m)
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def method(self):
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"A method"
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pass
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# Decorate using an iterable of function decorators.
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@method_decorator((myattr_dec, myattr2_dec), "method")
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class TestFunctionIterable:
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def method(self):
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"A method"
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pass
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# Decorate using an iterable of method decorators.
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decorators = (myattr_dec_m, myattr2_dec_m)
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@method_decorator(decorators, "method")
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class TestMethodIterable:
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def method(self):
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"A method"
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pass
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tests = (
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TestPlain,
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TestMethodAndClass,
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TestFunctionIterable,
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TestMethodIterable,
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)
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for Test in tests:
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with self.subTest(Test=Test):
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self.assertIs(getattr(Test().method, "myattr", False), True)
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self.assertIs(getattr(Test().method, "myattr2", False), True)
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self.assertIs(getattr(Test.method, "myattr", False), True)
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self.assertIs(getattr(Test.method, "myattr2", False), True)
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self.assertEqual(Test.method.__doc__, "A method")
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self.assertEqual(Test.method.__name__, "method")
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def test_new_attribute(self):
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"""A decorator that sets a new attribute on the method."""
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def decorate(func):
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func.x = 1
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return func
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class MyClass:
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@method_decorator(decorate)
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def method(self):
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return True
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obj = MyClass()
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self.assertEqual(obj.method.x, 1)
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self.assertIs(obj.method(), True)
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def test_bad_iterable(self):
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decorators = {myattr_dec_m, myattr2_dec_m}
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msg = "'set' object is not subscriptable"
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with self.assertRaisesMessage(TypeError, msg):
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@method_decorator(decorators, "method")
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class TestIterable:
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def method(self):
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"A method"
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pass
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# Test for argumented decorator
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def test_argumented(self):
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class Test:
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@method_decorator(ClsDec(False))
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def method(self):
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return True
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self.assertIs(Test().method(), False)
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def test_descriptors(self):
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def original_dec(wrapped):
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def _wrapped(arg):
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return wrapped(arg)
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return _wrapped
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method_dec = method_decorator(original_dec)
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class bound_wrapper:
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def __init__(self, wrapped):
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self.wrapped = wrapped
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self.__name__ = wrapped.__name__
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def __call__(self, arg):
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return self.wrapped(arg)
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def __get__(self, instance, cls=None):
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return self
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class descriptor_wrapper:
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def __init__(self, wrapped):
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self.wrapped = wrapped
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self.__name__ = wrapped.__name__
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def __get__(self, instance, cls=None):
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return bound_wrapper(self.wrapped.__get__(instance, cls))
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class Test:
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@method_dec
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@descriptor_wrapper
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def method(self, arg):
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return arg
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self.assertEqual(Test().method(1), 1)
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def test_class_decoration(self):
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"""
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@method_decorator can be used to decorate a class and its methods.
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"""
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def deco(func):
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def _wrapper(*args, **kwargs):
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return True
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return _wrapper
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@method_decorator(deco, name="method")
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class Test:
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def method(self):
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return False
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self.assertTrue(Test().method())
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def test_tuple_of_decorators(self):
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"""
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@method_decorator can accept a tuple of decorators.
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"""
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def add_question_mark(func):
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def _wrapper(*args, **kwargs):
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return func(*args, **kwargs) + "?"
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return _wrapper
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def add_exclamation_mark(func):
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def _wrapper(*args, **kwargs):
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return func(*args, **kwargs) + "!"
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return _wrapper
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# The order should be consistent with the usual order in which
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# decorators are applied, e.g.
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# @add_exclamation_mark
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# @add_question_mark
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# def func():
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# ...
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decorators = (add_exclamation_mark, add_question_mark)
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@method_decorator(decorators, name="method")
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class TestFirst:
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def method(self):
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return "hello world"
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class TestSecond:
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@method_decorator(decorators)
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def method(self):
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return "hello world"
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self.assertEqual(TestFirst().method(), "hello world?!")
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self.assertEqual(TestSecond().method(), "hello world?!")
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def test_invalid_non_callable_attribute_decoration(self):
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"""
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@method_decorator on a non-callable attribute raises an error.
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"""
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msg = (
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"Cannot decorate 'prop' as it isn't a callable attribute of "
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"<class 'Test'> (1)"
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)
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with self.assertRaisesMessage(TypeError, msg):
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@method_decorator(lambda: None, name="prop")
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class Test:
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prop = 1
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@classmethod
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def __module__(cls):
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return "tests"
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def test_invalid_method_name_to_decorate(self):
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"""
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@method_decorator on a nonexistent method raises an error.
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"""
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msg = (
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"The keyword argument `name` must be the name of a method of the "
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"decorated class: <class 'Test'>. Got 'nonexistent_method' instead"
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)
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with self.assertRaisesMessage(ValueError, msg):
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@method_decorator(lambda: None, name="nonexistent_method")
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class Test:
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@classmethod
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def __module__(cls):
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return "tests"
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def test_wrapper_assignments(self):
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"""@method_decorator preserves wrapper assignments."""
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func_name = None
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func_module = None
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def decorator(func):
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@wraps(func)
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def inner(*args, **kwargs):
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nonlocal func_name, func_module
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func_name = getattr(func, "__name__", None)
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func_module = getattr(func, "__module__", None)
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return func(*args, **kwargs)
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return inner
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class Test:
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@method_decorator(decorator)
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def method(self):
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return "tests"
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Test().method()
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self.assertEqual(func_name, "method")
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self.assertIsNotNone(func_module)
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