cpython/Lib/idlelib/idle_test/test_calltips.py

import unittest
import idlelib.CallTips as ct
import types

default_tip = ct._default_callable_argspec

# Test Class TC is used in multiple get_argspec test methods
class TC():
    'doc'
    tip = "(ai=None, *b)"
    def __init__(self, ai=None, *b): 'doc'
    __init__.tip = "(self, ai=None, *b)"
    def t1(self): 'doc'
    t1.tip = "(self)"
    def t2(self, ai, b=None): 'doc'
    t2.tip = "(self, ai, b=None)"
    def t3(self, ai, *args): 'doc'
    t3.tip = "(self, ai, *args)"
    def t4(self, *args): 'doc'
    t4.tip = "(self, *args)"
    def t5(self, ai, b=None, *args, **kw): 'doc'
    t5.tip = "(self, ai, b=None, *args, **kw)"
    def t6(no, self): 'doc'
    t6.tip = "(no, self)"
    def __call__(self, ci): 'doc'
    __call__.tip = "(self, ci)"
    # attaching .tip to wrapped methods does not work
    @classmethod
    def cm(cls, a): 'doc'
    @staticmethod
    def sm(b): 'doc'

tc = TC()

signature = ct.get_argspec  # 2.7 and 3.x use different functions
class Get_signatureTest(unittest.TestCase):
    # The signature function must return a string, even if blank.
    # Test a variety of objects to be sure that none cause it to raise
    # (quite aside from getting as correct an answer as possible).
    # The tests of builtins may break if inspect or the docstrings change,
    # but a red buildbot is better than a user crash (as has happened).
    # For a simple mismatch, change the expected output to the actual.

    def test_builtins(self):
        # These test will break if

        # Python class that inherits builtin methods
        class List(list): "List() doc"
        # Simulate builtin with no docstring for default argspec test
        class SB:  __call__ = None

        def gtest(obj, out):
            self.assertEqual(signature(obj), out)

        gtest(list, "list() -> new empty list")
        gtest(List, List.__doc__)
        gtest(list.__new__,
               'T.__new__(S, ...) -> a new object with type S, a subtype of T')
        gtest(list.__init__,
               'x.__init__(...) initializes x; see help(type(x)) for signature')
        append_doc =  "L.append(object) -> None -- append object to end"
        gtest(list.append, append_doc)
        gtest([].append, append_doc)
        gtest(List.append, append_doc)

        gtest(types.MethodType, "method(function, instance)")
        gtest(SB(), default_tip)

    def test_functions(self):
        def t1(): 'doc'
        t1.tip = "()"
        def t2(a, b=None): 'doc'
        t2.tip = "(a, b=None)"
        def t3(a, *args): 'doc'
        t3.tip = "(a, *args)"
        def t4(*args): 'doc'
        t4.tip = "(*args)"
        def t5(a, b=None, *args, **kw): 'doc'
        t5.tip = "(a, b=None, *args, **kw)"

        for func in (t1, t2, t3, t4, t5, TC):
            self.assertEqual(signature(func), func.tip + '\ndoc')

    def test_methods(self):
        for meth in (TC.t1, TC.t2, TC.t3, TC.t4, TC.t5, TC.t6, TC.__call__):
            self.assertEqual(signature(meth), meth.tip + "\ndoc")
        self.assertEqual(signature(TC.cm), "(a)\ndoc")
        self.assertEqual(signature(TC.sm), "(b)\ndoc")

    def test_bound_methods(self):
        # test that first parameter is correctly removed from argspec
        for meth, mtip  in ((tc.t1, "()"), (tc.t4, "(*args)"), (tc.t6, "(self)"),
                            (tc.__call__, '(ci)'), (tc, '(ci)'), (TC.cm, "(a)"),):
            self.assertEqual(signature(meth), mtip + "\ndoc")

    def test_non_ascii_name(self):
        # test that re works to delete a first parameter name that
        # includes non-ascii chars, such as various forms of A.
        uni = "(A\u0391\u0410\u05d0\u0627\u0905\u1e00\u3042, a)"
        assert ct._first_param.sub('', uni) == '(a)'

    def test_no_docstring(self):
        def nd(s): pass
        TC.nd = nd
        self.assertEqual(signature(nd), "(s)")
        self.assertEqual(signature(TC.nd), "(s)")
        self.assertEqual(signature(tc.nd), "()")

    def test_attribute_exception(self):
        class NoCall:
            def __getattr__(self, name):
                raise BaseException
        class Call(NoCall):
            def __call__(self, ci):
                pass
        for meth, mtip  in ((NoCall, default_tip), (Call, default_tip),
                            (NoCall(), ''), (Call(), '(ci)')):
            self.assertEqual(signature(meth), mtip)

    def test_non_callables(self):
        for obj in (0, 0.0, '0', b'0', [], {}):
            self.assertEqual(signature(obj), '')

class Get_entityTest(unittest.TestCase):
    def test_bad_entity(self):
        self.assertIsNone(ct.get_entity('1/0'))
    def test_good_entity(self):
        self.assertIs(ct.get_entity('int'), int)

if __name__ == '__main__':
    unittest.main(verbosity=2, exit=False)