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from __future__ import absolute_import
import sys
import doctest
import unittest
import decimal
import inspect
import functools
import collections
from collections import defaultdict
try:
c = collections.abc
except AttributeError:
c = collections
from decorator import dispatch_on, contextmanager, decorator
try:
from . import documentation as doc
except (ImportError, ValueError, SystemError): # depending on the py-version
import documentation as doc
@contextmanager
def assertRaises(etype):
"""This works in Python 2.6 too"""
try:
yield
except etype:
pass
else:
raise Exception('Expected %s' % etype.__name__)
if sys.version_info >= (3, 5):
exec('''from asyncio import get_event_loop
@decorator
async def before_after(coro, *args, **kwargs):
return "<before>" + (await coro(*args, **kwargs)) + "<after>"
@decorator
def coro_to_func(coro, *args, **kw):
return get_event_loop().run_until_complete(coro(*args, **kw))
class CoroutineTestCase(unittest.TestCase):
def test_before_after(self):
@before_after
async def coro(x):
return x
self.assertTrue(inspect.iscoroutinefunction(coro))
out = get_event_loop().run_until_complete(coro('x'))
self.assertEqual(out, '<before>x<after>')
def test_coro_to_func(self):
@coro_to_func
async def coro(x):
return x
self.assertFalse(inspect.iscoroutinefunction(coro))
self.assertEqual(coro('x'), 'x')
''')
def gen123():
yield 1
yield 2
yield 3
class GeneratorCallerTestCase(unittest.TestCase):
def test_gen123(self):
@decorator
def square(func, *args, **kw):
for x in gen123():
yield x * x
new = square(gen123)
self.assertTrue(inspect.isgeneratorfunction(new))
self.assertEqual(list(new()), [1, 4, 9])
class DocumentationTestCase(unittest.TestCase):
def test(self):
err = doctest.testmod(doc)[0]
self.assertEqual(err, 0)
def test_singledispatch1(self):
if hasattr(functools, 'singledispatch'):
with assertRaises(RuntimeError):
doc.singledispatch_example1()
def test_singledispatch2(self):
if hasattr(functools, 'singledispatch'):
doc.singledispatch_example2()
class ExtraTestCase(unittest.TestCase):
def test_qualname(self):
if sys.version_info >= (3, 3):
self.assertEqual(doc.hello.__qualname__, 'hello')
else:
with assertRaises(AttributeError):
doc.hello.__qualname__
def test_signature(self):
if hasattr(inspect, 'signature'):
sig = inspect.signature(doc.f1)
self.assertEqual(str(sig), '(x)')
def test_unique_filenames(self):
@decorator
def d1(f, *args, **kwargs):
return f(*args, **kwargs)
@decorator
def d2(f, *args, **kwargs):
return f(*args, **kwargs)
@d1
def f1(x, y, z):
pass
@d2
def f2(x, y, z):
pass
f1_orig = f1
@d1
def f1(x, y, z):
pass
self.assertNotEqual(d1.__code__.co_filename, d2.__code__.co_filename)
self.assertNotEqual(f1.__code__.co_filename, f2.__code__.co_filename)
self.assertNotEqual(f1_orig.__code__.co_filename,
f1.__code__.co_filename)
def test_no_first_arg(self):
@decorator
def example(*args, **kw):
return args[0](*args[1:], **kw)
@example
def func(**kw):
return kw
# there is no confusion when passing args as a keyword argument
self.assertEqual(func(args='a'), {'args': 'a'})
def test_decorator_factory(self):
# similar to what IPython is doing in traitlets.config.application
@decorator
def catch_config_error(method, app, *args, **kwargs):
return method(app)
catch_config_error(lambda app: None)
def test_add1(self):
# similar to what IPython is doing in traitlets.config.application
@decorator
def add(func, const=1, *args, **kwargs):
return const + func(*args, **kwargs)
def f(x):
return x
self.assertEqual(add(f, 2)(0), 2)
# ################### test dispatch_on ############################# #
# adapted from test_functools in Python 3.5
singledispatch = dispatch_on('obj')
class TestSingleDispatch(unittest.TestCase):
def test_simple_overloads(self):
@singledispatch
def g(obj):
return "base"
@g.register(int)
def g_int(i):
return "integer"
self.assertEqual(g("str"), "base")
self.assertEqual(g(1), "integer")
self.assertEqual(g([1, 2, 3]), "base")
def test_mro(self):
@singledispatch
def g(obj):
return "base"
class A(object):
pass
class C(A):
pass
class B(A):
pass
class D(C, B):
pass
@g.register(A)
def g_A(a):
return "A"
@g.register(B)
def g_B(b):
return "B"
self.assertEqual(g(A()), "A")
self.assertEqual(g(B()), "B")
self.assertEqual(g(C()), "A")
self.assertEqual(g(D()), "B")
def test_register_decorator(self):
@singledispatch
def g(obj):
return "base"
@g.register(int)
def g_int(i):
return "int %s" % (i,)
self.assertEqual(g(""), "base")
self.assertEqual(g(12), "int 12")
def test_register_error(self):
@singledispatch
def g(obj):
return "base"
with assertRaises(TypeError):
# wrong number of arguments
@g.register(int)
def g_int():
return "int"
def test_wrapping_attributes(self):
@singledispatch
def g(obj):
"Simple test"
return "Test"
self.assertEqual(g.__name__, "g")
if sys.flags.optimize < 2:
self.assertEqual(g.__doc__, "Simple test")
def test_c_classes(self):
@singledispatch
def g(obj):
return "base"
@g.register(decimal.DecimalException)
def _(obj):
return obj.args
subn = decimal.Subnormal("Exponent < Emin")
rnd = decimal.Rounded("Number got rounded")
self.assertEqual(g(subn), ("Exponent < Emin",))
self.assertEqual(g(rnd), ("Number got rounded",))
@g.register(decimal.Subnormal)
def _g(obj):
return "Too small to care."
self.assertEqual(g(subn), "Too small to care.")
self.assertEqual(g(rnd), ("Number got rounded",))
def test_register_abc(self):
d = {"a": "b"}
l = [1, 2, 3]
s = set([object(), None])
f = frozenset(s)
t = (1, 2, 3)
@singledispatch
def g(obj):
return "base"
self.assertEqual(g(d), "base")
self.assertEqual(g(l), "base")
self.assertEqual(g(s), "base")
self.assertEqual(g(f), "base")
self.assertEqual(g(t), "base")
g.register(c.Sized)(lambda obj: "sized")
self.assertEqual(g(d), "sized")
self.assertEqual(g(l), "sized")
self.assertEqual(g(s), "sized")
self.assertEqual(g(f), "sized")
self.assertEqual(g(t), "sized")
g.register(c.MutableMapping)(lambda obj: "mutablemapping")
self.assertEqual(g(d), "mutablemapping")
self.assertEqual(g(l), "sized")
self.assertEqual(g(s), "sized")
self.assertEqual(g(f), "sized")
self.assertEqual(g(t), "sized")
if hasattr(c, 'ChainMap'):
g.register(c.ChainMap)(lambda obj: "chainmap")
# irrelevant ABCs registered
self.assertEqual(g(d), "mutablemapping")
self.assertEqual(g(l), "sized")
self.assertEqual(g(s), "sized")
self.assertEqual(g(f), "sized")
self.assertEqual(g(t), "sized")
g.register(c.MutableSequence)(lambda obj: "mutablesequence")
self.assertEqual(g(d), "mutablemapping")
self.assertEqual(g(l), "mutablesequence")
self.assertEqual(g(s), "sized")
self.assertEqual(g(f), "sized")
self.assertEqual(g(t), "sized")
g.register(c.MutableSet)(lambda obj: "mutableset")
self.assertEqual(g(d), "mutablemapping")
self.assertEqual(g(l), "mutablesequence")
self.assertEqual(g(s), "mutableset")
self.assertEqual(g(f), "sized")
self.assertEqual(g(t), "sized")
g.register(c.Mapping)(lambda obj: "mapping")
self.assertEqual(g(d), "mutablemapping") # not specific enough
self.assertEqual(g(l), "mutablesequence")
self.assertEqual(g(s), "mutableset")
self.assertEqual(g(f), "sized")
self.assertEqual(g(t), "sized")
g.register(c.Sequence)(lambda obj: "sequence")
self.assertEqual(g(d), "mutablemapping")
self.assertEqual(g(l), "mutablesequence")
self.assertEqual(g(s), "mutableset")
self.assertEqual(g(f), "sized")
self.assertEqual(g(t), "sequence")
g.register(c.Set)(lambda obj: "set")
self.assertEqual(g(d), "mutablemapping")
self.assertEqual(g(l), "mutablesequence")
self.assertEqual(g(s), "mutableset")
self.assertEqual(g(f), "set")
self.assertEqual(g(t), "sequence")
g.register(dict)(lambda obj: "dict")
self.assertEqual(g(d), "dict")
self.assertEqual(g(l), "mutablesequence")
self.assertEqual(g(s), "mutableset")
self.assertEqual(g(f), "set")
self.assertEqual(g(t), "sequence")
g.register(list)(lambda obj: "list")
self.assertEqual(g(d), "dict")
self.assertEqual(g(l), "list")
self.assertEqual(g(s), "mutableset")
self.assertEqual(g(f), "set")
self.assertEqual(g(t), "sequence")
g.register(set)(lambda obj: "concrete-set")
self.assertEqual(g(d), "dict")
self.assertEqual(g(l), "list")
self.assertEqual(g(s), "concrete-set")
self.assertEqual(g(f), "set")
self.assertEqual(g(t), "sequence")
g.register(frozenset)(lambda obj: "frozen-set")
self.assertEqual(g(d), "dict")
self.assertEqual(g(l), "list")
self.assertEqual(g(s), "concrete-set")
self.assertEqual(g(f), "frozen-set")
self.assertEqual(g(t), "sequence")
g.register(tuple)(lambda obj: "tuple")
self.assertEqual(g(d), "dict")
self.assertEqual(g(l), "list")
self.assertEqual(g(s), "concrete-set")
self.assertEqual(g(f), "frozen-set")
self.assertEqual(g(t), "tuple")
def test_mro_conflicts(self):
@singledispatch
def g(obj):
return "base"
class O(c.Sized):
def __len__(self):
return 0
o = O()
self.assertEqual(g(o), "base")
g.register(c.Iterable)(lambda arg: "iterable")
g.register(c.Container)(lambda arg: "container")
g.register(c.Sized)(lambda arg: "sized")
g.register(c.Set)(lambda arg: "set")
self.assertEqual(g(o), "sized")
c.Iterable.register(O)
self.assertEqual(g(o), "sized")
c.Container.register(O)
with assertRaises(RuntimeError): # was "sized" because in mro
self.assertEqual(g(o), "sized")
c.Set.register(O)
self.assertEqual(g(o), "set")
class P(object):
pass
p = P()
self.assertEqual(g(p), "base")
c.Iterable.register(P)
self.assertEqual(g(p), "iterable")
c.Container.register(P)
with assertRaises(RuntimeError):
self.assertEqual(g(p), "iterable")
class Q(c.Sized):
def __len__(self):
return 0
q = Q()
self.assertEqual(g(q), "sized")
c.Iterable.register(Q)
self.assertEqual(g(q), "sized")
c.Set.register(Q)
self.assertEqual(g(q), "set")
# because c.Set is a subclass of c.Sized and c.Iterable
@singledispatch
def h(obj):
return "base"
@h.register(c.Sized)
def h_sized(arg):
return "sized"
@h.register(c.Container)
def h_container(arg):
return "container"
# Even though Sized and Container are explicit bases of MutableMapping,
# this ABC is implicitly registered on defaultdict which makes all of
# MutableMapping's bases implicit as well from defaultdict's
# perspective.
with assertRaises(RuntimeError):
self.assertEqual(h(defaultdict(lambda: 0)), "sized")
class R(defaultdict):
pass
c.MutableSequence.register(R)
@singledispatch
def i(obj):
return "base"
@i.register(c.MutableMapping)
def i_mapping(arg):
return "mapping"
@i.register(c.MutableSequence)
def i_sequence(arg):
return "sequence"
r = R()
with assertRaises(RuntimeError): # was no error
self.assertEqual(i(r), "sequence")
class S(object):
pass
class T(S, c.Sized):
def __len__(self):
return 0
t = T()
self.assertEqual(h(t), "sized")
c.Container.register(T)
self.assertEqual(h(t), "sized") # because it's explicitly in the MRO
class U(object):
def __len__(self):
return 0
u = U()
self.assertEqual(h(u), "sized")
# implicit Sized subclass inferred
# from the existence of __len__()
c.Container.register(U)
# There is no preference for registered versus inferred ABCs.
with assertRaises(RuntimeError):
h(u)
if __name__ == '__main__':
unittest.main()
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