test_collections.py

"""Unit tests for collections.py."""

import unittest
from test import test_support
from collections import NamedTuple
from collections import Hashable, Iterable, Iterator
from collections import Sized, Container, Callable
from collections import Set, MutableSet
from collections import Mapping, MutableMapping
from collections import Sequence, MutableSequence


class TestNamedTuple(unittest.TestCase):

    def test_factory(self):
        Point = NamedTuple('Point', 'x y')
        self.assertEqual(Point.__name__, 'Point')
        self.assertEqual(Point.__doc__, 'Point(x, y)')
        self.assertEqual(Point.__slots__, ())
        self.assertEqual(Point.__module__, __name__)
        self.assertEqual(Point.__getitem__, tuple.__getitem__)
        self.assertRaises(ValueError, NamedTuple, 'abc%', 'def ghi')
        self.assertRaises(ValueError, NamedTuple, 'abc', 'def g%hi')
        NamedTuple('Point0', 'x1 y2')   # Verify that numbers are allowed in names

    def test_instance(self):
        Point = NamedTuple('Point', 'x y')
        p = Point(11, 22)
        self.assertEqual(p, Point(x=11, y=22))
        self.assertEqual(p, Point(11, y=22))
        self.assertEqual(p, Point(y=22, x=11))
        self.assertEqual(p, Point(*(11, 22)))
        self.assertEqual(p, Point(**dict(x=11, y=22)))
        self.assertRaises(TypeError, Point, 1)                              # too few args
        self.assertRaises(TypeError, Point, 1, 2, 3)                        # too many args
        self.assertRaises(TypeError, eval, 'Point(XXX=1, y=2)', locals())   # wrong keyword argument
        self.assertRaises(TypeError, eval, 'Point(x=1)', locals())          # missing keyword argument
        self.assertEqual(repr(p), 'Point(x=11, y=22)')
        self.assert_('__dict__' not in dir(p))                              # verify instance has no dict
        self.assert_('__weakref__' not in dir(p))

    def test_tupleness(self):
        Point = NamedTuple('Point', 'x y')
        p = Point(11, 22)

        self.assert_(isinstance(p, tuple))
        self.assertEqual(p, (11, 22))                                       # matches a real tuple
        self.assertEqual(tuple(p), (11, 22))                                # coercable to a real tuple
        self.assertEqual(list(p), [11, 22])                                 # coercable to a list
        self.assertEqual(max(p), 22)                                        # iterable
        self.assertEqual(max(*p), 22)                                       # star-able
        x, y = p
        self.assertEqual(p, (x, y))                                         # unpacks like a tuple
        self.assertEqual((p[0], p[1]), (11, 22))                            # indexable like a tuple
        self.assertRaises(IndexError, p.__getitem__, 3)

        self.assertEqual(p.x, x)
        self.assertEqual(p.y, y)
        self.assertRaises(AttributeError, eval, 'p.z', locals())


class TestOneTrickPonyABCs(unittest.TestCase):

    def test_Hashable(self):
        # Check some non-hashables
        non_samples = [bytes(), list(), set(), dict()]
        for x in non_samples:
            self.failIf(isinstance(x, Hashable), repr(x))
            self.failIf(issubclass(type(x), Hashable), repr(type(x)))
        # Check some hashables
        samples = [None,
                   int(), float(), complex(),
                   str(),
                   tuple(), frozenset(),
                   int, list, object, type,
                   ]
        for x in samples:
            self.failUnless(isinstance(x, Hashable), repr(x))
            self.failUnless(issubclass(type(x), Hashable), repr(type(x)))
        self.assertRaises(TypeError, Hashable)
        # Check direct subclassing
        class H(Hashable):
            def __hash__(self):
                return super().__hash__()
        self.assertEqual(hash(H()), 0)
        self.failIf(issubclass(int, H))

    def test_Iterable(self):
        # Check some non-iterables
        non_samples = [None, 42, 3.14, 1j]
        for x in non_samples:
            self.failIf(isinstance(x, Iterable), repr(x))
            self.failIf(issubclass(type(x), Iterable), repr(type(x)))
        # Check some iterables
        samples = [bytes(), str(),
                   tuple(), list(), set(), frozenset(), dict(),
                   dict().keys(), dict().items(), dict().values(),
                   (lambda: (yield))(),
                   (x for x in []),
                   ]
        for x in samples:
            self.failUnless(isinstance(x, Iterable), repr(x))
            self.failUnless(issubclass(type(x), Iterable), repr(type(x)))
        # Check direct subclassing
        class I(Iterable):
            def __iter__(self):
                return super().__iter__()
        self.assertEqual(list(I()), [])
        self.failIf(issubclass(str, I))

    def test_Iterator(self):
        non_samples = [None, 42, 3.14, 1j, b"", "", (), [], {}, set()]
        for x in non_samples:
            self.failIf(isinstance(x, Iterator), repr(x))
            self.failIf(issubclass(type(x), Iterator), repr(type(x)))
        samples = [iter(bytes()), iter(str()),
                   iter(tuple()), iter(list()), iter(dict()),
                   iter(set()), iter(frozenset()),
                   iter(dict().keys()), iter(dict().items()),
                   iter(dict().values()),
                   (lambda: (yield))(),
                   (x for x in []),
                   ]
        for x in samples:
            self.failUnless(isinstance(x, Iterator), repr(x))
            self.failUnless(issubclass(type(x), Iterator), repr(type(x)))

    def test_Sized(self):
        non_samples = [None, 42, 3.14, 1j,
                       (lambda: (yield))(),
                       (x for x in []),
                       ]
        for x in non_samples:
            self.failIf(isinstance(x, Sized), repr(x))
            self.failIf(issubclass(type(x), Sized), repr(type(x)))
        samples = [bytes(), str(),
                   tuple(), list(), set(), frozenset(), dict(),
                   dict().keys(), dict().items(), dict().values(),
                   ]
        for x in samples:
            self.failUnless(isinstance(x, Sized), repr(x))
            self.failUnless(issubclass(type(x), Sized), repr(type(x)))

    def test_Container(self):
        non_samples = [None, 42, 3.14, 1j,
                       (lambda: (yield))(),
                       (x for x in []),
                       ]
        for x in non_samples:
            self.failIf(isinstance(x, Container), repr(x))
            self.failIf(issubclass(type(x), Container), repr(type(x)))
        samples = [bytes(), str(),
                   tuple(), list(), set(), frozenset(), dict(),
                   dict().keys(), dict().items(),
                   ]
        for x in samples:
            self.failUnless(isinstance(x, Container), repr(x))
            self.failUnless(issubclass(type(x), Container), repr(type(x)))

    def test_Callable(self):
        non_samples = [None, 42, 3.14, 1j,
                       "", b"", (), [], {}, set(),
                       (lambda: (yield))(),
                       (x for x in []),
                       ]
        for x in non_samples:
            self.failIf(isinstance(x, Callable), repr(x))
            self.failIf(issubclass(type(x), Callable), repr(type(x)))
        samples = [lambda: None,
                   type, int, object,
                   len,
                   list.append, [].append,
                   ]
        for x in samples:
            self.failUnless(isinstance(x, Callable), repr(x))
            self.failUnless(issubclass(type(x), Callable), repr(type(x)))

    def test_direct_subclassing(self):
        for B in Hashable, Iterable, Iterator, Sized, Container, Callable:
            class C(B):
                pass
            self.failUnless(issubclass(C, B))
            self.failIf(issubclass(int, C))

    def test_registration(self):
        for B in Hashable, Iterable, Iterator, Sized, Container, Callable:
            class C:
                __hash__ = None  # Make sure it isn't hashable by default
            self.failIf(issubclass(C, B), B.__name__)
            B.register(C)
            self.failUnless(issubclass(C, B))


class TestCollectionABCs(unittest.TestCase):

    # XXX For now, we only test some virtual inheritance properties.
    # We should also test the proper behavior of the collection ABCs
    # as real base classes or mix-in classes.

    def test_Set(self):
        for sample in [set, frozenset]:
            self.failUnless(isinstance(sample(), Set))
            self.failUnless(issubclass(sample, Set))

    def test_MutableSet(self):
        self.failUnless(isinstance(set(), MutableSet))
        self.failUnless(issubclass(set, MutableSet))
        self.failIf(isinstance(frozenset(), MutableSet))
        self.failIf(issubclass(frozenset, MutableSet))

    def test_Mapping(self):
        for sample in [dict]:
            self.failUnless(isinstance(sample(), Mapping))
            self.failUnless(issubclass(sample, Mapping))

    def test_MutableMapping(self):
        for sample in [dict]:
            self.failUnless(isinstance(sample(), MutableMapping))
            self.failUnless(issubclass(sample, MutableMapping))

    def test_Sequence(self):
        for sample in [tuple, list, bytes, str]:
            self.failUnless(isinstance(sample(), Sequence))
            self.failUnless(issubclass(sample, Sequence))
        self.failUnless(issubclass(basestring, Sequence))

    def test_MutableSequence(self):
        for sample in [tuple, str]:
            self.failIf(isinstance(sample(), MutableSequence))
            self.failIf(issubclass(sample, MutableSequence))
        for sample in [list, bytes]:
            self.failUnless(isinstance(sample(), MutableSequence))
            self.failUnless(issubclass(sample, MutableSequence))
        self.failIf(issubclass(basestring, MutableSequence))


def test_main(verbose=None):
    import collections as CollectionsModule
    test_classes = [TestNamedTuple, TestOneTrickPonyABCs, TestCollectionABCs]
    test_support.run_unittest(*test_classes)
    test_support.run_doctest(CollectionsModule, verbose)


if __name__ == "__main__":
    test_main(verbose=True)