Skip test that builtin signature can't be inspected

Builtins can now provide a signature, and sum() does so as of Python
3.5. I thought this is related to PEP 436, but that still appears to be
in draft status, so I'm not sure.

IPython/core/tests/test_oinspect.py

@@ -1,382 +1,383 b''
 """Tests for the object inspection functionality.
 """
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2010-2011 The IPython Development Team.
 #
 #  Distributed under the terms of the BSD License.
 #
 #  The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 from __future__ import print_function
 
 # Stdlib imports
 import os
 import re
 
 # Third-party imports
 import nose.tools as nt
 
 # Our own imports
 from .. import oinspect
 from IPython.core.magic import (Magics, magics_class, line_magic,
                                 cell_magic, line_cell_magic,
                                 register_line_magic, register_cell_magic,
                                 register_line_cell_magic)
 from decorator import decorator
 from IPython.testing.decorators import skipif
 from IPython.testing.tools import AssertPrints
 from IPython.utils.path import compress_user
 from IPython.utils import py3compat
 
 
 #-----------------------------------------------------------------------------
 # Globals and constants
 #-----------------------------------------------------------------------------
 
 inspector = oinspect.Inspector()
 ip = get_ipython()
 
 #-----------------------------------------------------------------------------
 # Local utilities
 #-----------------------------------------------------------------------------
 
 # WARNING: since this test checks the line number where a function is
 # defined, if any code is inserted above, the following line will need to be
 # updated.  Do NOT insert any whitespace between the next line and the function
 # definition below.
 THIS_LINE_NUMBER = 51  # Put here the actual number of this line
 def test_find_source_lines():
     nt.assert_equal(oinspect.find_source_lines(test_find_source_lines), 
                     THIS_LINE_NUMBER+1)
 
 
 # A couple of utilities to ensure these tests work the same from a source or a
 # binary install
 def pyfile(fname):
     return os.path.normcase(re.sub('.py[co]$', '.py', fname))
 
 
 def match_pyfiles(f1, f2):
     nt.assert_equal(pyfile(f1), pyfile(f2))
 
 
 def test_find_file():
     match_pyfiles(oinspect.find_file(test_find_file), os.path.abspath(__file__))
 
 
 def test_find_file_decorated1():
 
     @decorator
     def noop1(f):
         def wrapper():
             return f(*a, **kw)
         return wrapper
 
     @noop1
     def f(x):
         "My docstring"
     
     match_pyfiles(oinspect.find_file(f), os.path.abspath(__file__))
     nt.assert_equal(f.__doc__, "My docstring")
 
 
 def test_find_file_decorated2():
 
     @decorator
     def noop2(f, *a, **kw):
         return f(*a, **kw)
 
     @noop2
     def f(x):
         "My docstring 2"
     
     match_pyfiles(oinspect.find_file(f), os.path.abspath(__file__))
     nt.assert_equal(f.__doc__, "My docstring 2")
     
 
 def test_find_file_magic():
     run = ip.find_line_magic('run')
     nt.assert_not_equal(oinspect.find_file(run), None)
 
 
 # A few generic objects we can then inspect in the tests below
 
 class Call(object):
     """This is the class docstring."""
 
     def __init__(self, x, y=1):
         """This is the constructor docstring."""
 
     def __call__(self, *a, **kw):
         """This is the call docstring."""
 
     def method(self, x, z=2):
         """Some method's docstring"""
 
 class SimpleClass(object):
     def method(self, x, z=2):
         """Some method's docstring"""
 
 
 class OldStyle:
     """An old-style class for testing."""
     pass
 
 
 def f(x, y=2, *a, **kw):
     """A simple function."""
 
 
 def g(y, z=3, *a, **kw):
     pass  # no docstring
 
 
 @register_line_magic
 def lmagic(line):
     "A line magic"
 
 
 @register_cell_magic
 def cmagic(line, cell):
     "A cell magic"
 
 
 @register_line_cell_magic
 def lcmagic(line, cell=None):
     "A line/cell magic"
 
 
 @magics_class
 class SimpleMagics(Magics):
     @line_magic
     def Clmagic(self, cline):
         "A class-based line magic"
         
     @cell_magic
     def Ccmagic(self, cline, ccell):
         "A class-based cell magic"
         
     @line_cell_magic
     def Clcmagic(self, cline, ccell=None):
         "A class-based line/cell magic"
 
 
 class Awkward(object):
     def __getattr__(self, name):
         raise Exception(name)
 
 
 def check_calltip(obj, name, call, docstring):
     """Generic check pattern all calltip tests will use"""
     info = inspector.info(obj, name)
     call_line, ds = oinspect.call_tip(info)
     nt.assert_equal(call_line, call)
     nt.assert_equal(ds, docstring)
 
 #-----------------------------------------------------------------------------
 # Tests
 #-----------------------------------------------------------------------------
 
 def test_calltip_class():
     check_calltip(Call, 'Call', 'Call(x, y=1)', Call.__init__.__doc__)
 
 
 def test_calltip_instance():
     c = Call(1)
     check_calltip(c, 'c', 'c(*a, **kw)', c.__call__.__doc__)
 
 
 def test_calltip_method():
     c = Call(1)
     check_calltip(c.method, 'c.method', 'c.method(x, z=2)', c.method.__doc__)
 
 
 def test_calltip_function():
     check_calltip(f, 'f', 'f(x, y=2, *a, **kw)', f.__doc__)
 
 
 def test_calltip_function2():
     check_calltip(g, 'g', 'g(y, z=3, *a, **kw)', '<no docstring>')
 
 
+@skipif(sys.version_info >= (3, 5))
 def test_calltip_builtin():
     check_calltip(sum, 'sum', None, sum.__doc__)
 
 
 def test_calltip_line_magic():
     check_calltip(lmagic, 'lmagic', 'lmagic(line)', "A line magic")
 
         
 def test_calltip_cell_magic():
     check_calltip(cmagic, 'cmagic', 'cmagic(line, cell)', "A cell magic")
 
         
 def test_calltip_line_cell_magic():
     check_calltip(lcmagic, 'lcmagic', 'lcmagic(line, cell=None)', 
                   "A line/cell magic")
         
 
 def test_class_magics():
     cm = SimpleMagics(ip)
     ip.register_magics(cm)
     check_calltip(cm.Clmagic, 'Clmagic', 'Clmagic(cline)',
                   "A class-based line magic")
     check_calltip(cm.Ccmagic, 'Ccmagic', 'Ccmagic(cline, ccell)',
                   "A class-based cell magic")
     check_calltip(cm.Clcmagic, 'Clcmagic', 'Clcmagic(cline, ccell=None)',
                   "A class-based line/cell magic")
     
 
 def test_info():
     "Check that Inspector.info fills out various fields as expected."
     i = inspector.info(Call, oname='Call')
     nt.assert_equal(i['type_name'], 'type')
     expted_class = str(type(type))  # <class 'type'> (Python 3) or <type 'type'>
     nt.assert_equal(i['base_class'], expted_class)
     nt.assert_equal(i['string_form'], "<class 'IPython.core.tests.test_oinspect.Call'>")
     fname = __file__
     if fname.endswith(".pyc"):
         fname = fname[:-1]
     # case-insensitive comparison needed on some filesystems
     # e.g. Windows:
     nt.assert_equal(i['file'].lower(), compress_user(fname).lower())
     nt.assert_equal(i['definition'], None)
     nt.assert_equal(i['docstring'], Call.__doc__)
     nt.assert_equal(i['source'], None)
     nt.assert_true(i['isclass'])
     nt.assert_equal(i['init_definition'], "Call(self, x, y=1)\n")
     nt.assert_equal(i['init_docstring'], Call.__init__.__doc__)
 
     i = inspector.info(Call, detail_level=1)
     nt.assert_not_equal(i['source'], None)
     nt.assert_equal(i['docstring'], None)
 
     c = Call(1)
     c.__doc__ = "Modified instance docstring"
     i = inspector.info(c)
     nt.assert_equal(i['type_name'], 'Call')
     nt.assert_equal(i['docstring'], "Modified instance docstring")
     nt.assert_equal(i['class_docstring'], Call.__doc__)
     nt.assert_equal(i['init_docstring'], Call.__init__.__doc__)
     nt.assert_equal(i['call_docstring'], Call.__call__.__doc__)
 
     # Test old-style classes, which for example may not have an __init__ method.
     if not py3compat.PY3:
         i = inspector.info(OldStyle)
         nt.assert_equal(i['type_name'], 'classobj')
 
         i = inspector.info(OldStyle())
         nt.assert_equal(i['type_name'], 'instance')
         nt.assert_equal(i['docstring'], OldStyle.__doc__)
 
 def test_info_awkward():
     # Just test that this doesn't throw an error.
     i = inspector.info(Awkward())
 
 def test_calldef_none():
     # We should ignore __call__ for all of these.
     for obj in [f, SimpleClass().method, any, str.upper]:
         print(obj)
         i = inspector.info(obj)
         nt.assert_is(i['call_def'], None)
 
 if py3compat.PY3:
     exec("def f_kwarg(pos, *, kwonly): pass")
 
 @skipif(not py3compat.PY3)
 def test_definition_kwonlyargs():
     i = inspector.info(f_kwarg, oname='f_kwarg')  # analysis:ignore
     nt.assert_equal(i['definition'], "f_kwarg(pos, *, kwonly)\n")
 
 def test_getdoc():
     class A(object):
         """standard docstring"""
         pass
     
     class B(object):
         """standard docstring"""
         def getdoc(self):
             return "custom docstring"
     
     class C(object):
         """standard docstring"""
         def getdoc(self):
             return None
     
     a = A()
     b = B()
     c = C()
     
     nt.assert_equal(oinspect.getdoc(a), "standard docstring")
     nt.assert_equal(oinspect.getdoc(b), "custom docstring")
     nt.assert_equal(oinspect.getdoc(c), "standard docstring")
 
 
 def test_empty_property_has_no_source():
     i = inspector.info(property(), detail_level=1)
     nt.assert_is(i['source'], None)
 
 
 def test_property_sources():
     import zlib
 
     class A(object):
         @property
         def foo(self):
             return 'bar'
 
         foo = foo.setter(lambda self, v: setattr(self, 'bar', v))
 
         id = property(id)
         compress = property(zlib.compress)
 
     i = inspector.info(A.foo, detail_level=1)
     nt.assert_in('def foo(self):', i['source'])
     nt.assert_in('lambda self, v:', i['source'])
 
     i = inspector.info(A.id, detail_level=1)
     nt.assert_in('fget = <function id>', i['source'])
 
     i = inspector.info(A.compress, detail_level=1)
     nt.assert_in('fget = <function zlib.compress>', i['source'])
 
 
 def test_property_docstring_is_in_info_for_detail_level_0():
     class A(object):
         @property
         def foobar():
             """This is `foobar` property."""
             pass
 
     ip.user_ns['a_obj'] = A()
     nt.assert_equals(
         'This is `foobar` property.',
         ip.object_inspect('a_obj.foobar', detail_level=0)['docstring'])
 
     ip.user_ns['a_cls'] = A
     nt.assert_equals(
         'This is `foobar` property.',
         ip.object_inspect('a_cls.foobar', detail_level=0)['docstring'])
 
 
 def test_pdef():
     # See gh-1914
     def foo(): pass
     inspector.pdef(foo, 'foo')
 
 def test_pinfo_nonascii():
     # See gh-1177
     from . import nonascii2
     ip.user_ns['nonascii2'] = nonascii2
     ip._inspect('pinfo', 'nonascii2', detail_level=1)
 
 def test_pinfo_magic():
     with AssertPrints('Docstring:'):
         ip._inspect('pinfo', 'lsmagic', detail_level=0)
 
     with AssertPrints('Source:'):
         ip._inspect('pinfo', 'lsmagic', detail_level=1)