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✏️ test_calltips.py

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import unittest
import idlelib.CallTips as ct
CTi = ct.CallTips()  # needed for get_entity test in 2.7
import textwrap
import types
import warnings

default_tip = ''

# Test Class TC is used in multiple get_argspec test methods
class TC(object):
    'doc'
    tip = "(ai=None, *args)"
    def __init__(self, ai=None, *b): 'doc'
    __init__.tip = "(self, ai=None, *args)"
    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, **kwargs)"
    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_arg_text  # 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 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):
        # 2.7 puts '()\n' where 3.x does not, other minor differences

# 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)

if List.__doc__ is not None:
            gtest(List, '()\n' + 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) -- append object to end"
        gtest(list.append, append_doc)
        gtest([].append, append_doc)
        gtest(List.append, append_doc)

gtest(types.MethodType, '()\ninstancemethod(function, instance, class)')
        gtest(SB(), default_tip)

def test_signature_wrap(self):
        # This is also a test of an old-style class
        if textwrap.TextWrapper.__doc__ is not None:
            self.assertEqual(signature(textwrap.TextWrapper), '''\
(width=70, initial_indent='', subsequent_indent='', expand_tabs=True,
    replace_whitespace=True, fix_sentence_endings=False, break_long_words=True,
    drop_whitespace=True, break_on_hyphens=True)''')

def test_docline_truncation(self):
        def f(): pass
        f.__doc__ = 'a'*300
        self.assertEqual(signature(f), '()\n' + 'a' * (ct._MAX_COLS-3) + '...')

def test_multiline_docstring(self):
        # Test fewer lines than max.
        self.assertEqual(signature(list),
                "()\nlist() -> new empty list\n"
                "list(iterable) -> new list initialized from iterable's items")

# Test max lines and line (currently) too long.
        def f():
            pass
        s = 'a\nb\nc\nd\n'
        f.__doc__ = s + 300 * 'e' + 'f'
        self.assertEqual(signature(f),
                         '()\n' + s + (ct._MAX_COLS - 3) * 'e' + '...')

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, **kwds): 'doc'
        t5.tip = "(a, b=None, *args, **kwargs)"

doc = '\ndoc' if t1.__doc__ is not None else ''
        for func in (t1, t2, t3, t4, t5, TC):
            self.assertEqual(signature(func), func.tip + doc)

def test_methods(self):
        doc = '\ndoc' if TC.__doc__ is not None else ''
        for meth in (TC.t1, TC.t2, TC.t3, TC.t4, TC.t5, TC.t6, TC.__call__):
            self.assertEqual(signature(meth), meth.tip + doc)
        self.assertEqual(signature(TC.cm), "(a)" + doc)
        self.assertEqual(signature(TC.sm), "(b)" + doc)

def test_bound_methods(self):
        # test that first parameter is correctly removed from argspec
        doc = '\ndoc' if TC.__doc__ is not None else ''
        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 + doc)

def test_starred_parameter(self):
        # test that starred first parameter is *not* removed from argspec
        class C:
            def m1(*args): pass
            def m2(**kwds): pass
        def f1(args, kwargs, *a, **k): pass
        def f2(args, kwargs, args1, kwargs1, *a, **k): pass
        c = C()
        self.assertEqual(signature(C.m1), '(*args)')
        self.assertEqual(signature(c.m1), '(*args)')
        self.assertEqual(signature(C.m2), '(**kwargs)')
        self.assertEqual(signature(c.m2), '(**kwargs)')
        self.assertEqual(signature(f1), '(args, kwargs, *args1, **kwargs1)')
        self.assertEqual(signature(f2),
                         '(args, kwargs, args1, kwargs1, *args2, **kwargs2)')

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(object):
            def __getattr__(self, name):
                raise BaseException
        class Call(NoCall):
            def __call__(self, ci):
                pass
        for meth, mtip  in ((NoCall, '()'), (Call, '()'),
                            (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):
    # In 3.x, get_entity changed from 'instance method' to module function
    # since 'self' not used. Use dummy instance until change 2.7 also.
    def test_bad_entity(self):
        self.assertIsNone(CTi.get_entity('1//0'))
    def test_good_entity(self):
        self.assertIs(CTi.get_entity('int'), int)

class Py2Test(unittest.TestCase):
    def test_paramtuple_float(self):
        # 18539: (a,b) becomes '.0' in code object; change that but not 0.0
        with warnings.catch_warnings():
            # Suppess message of py3 deprecation of parameter unpacking
            warnings.simplefilter("ignore")
            exec "def f((a,b), c=0.0): pass"
        self.assertEqual(signature(f), '(<tuple>, c=0.0)')

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

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✏️ test_calltips.py