def test_ordering(self):
s = mappings.OrderedFrozenSet('set')
assert 'set' == ''.join(s)
assert 'tes' == ''.join(reversed(s))
s = mappings.OrderedFrozenSet('setordered')
assert 'setord' == ''.join(s)
assert 'drotes' == ''.join(reversed(s))
def test_immmutability(self):
s = mappings.OrderedFrozenSet(range(9))
assert len(s) == 9
with pytest.raises(AttributeError):
s.add(9)
with pytest.raises(AttributeError):
s.discard(0)
with pytest.raises(AttributeError):
s.update(range(5))
def test_magic_methods(self):
s = mappings.OrderedFrozenSet(range(9))
for x in range(9):
assert x in s
assert len(s) == 9
# test indexing support
for i in range(9):
assert s[i] == i
with pytest.raises(IndexError, match='index out of range'):
s[9]
assert s == set(range(9))
assert str(s) == str(set(range(9)))
assert repr(s) == str(s)
assert hash(s)
def test_symmetric_difference(self):
s = mappings.OrderedFrozenSet(range(9))
new = s.symmetric_difference({0, 9})
assert new == mappings.OrderedFrozenSet(range(1, 10))
assert new == s ^ {0, 9}
assert isinstance(new, mappings.OrderedFrozenSet)
def test_difference(self):
s = mappings.OrderedFrozenSet(range(9))
new = s.difference({8})
assert new == mappings.OrderedFrozenSet(range(8))
assert new == s - {8}
assert isinstance(new, mappings.OrderedFrozenSet)
def test_union(self):
s = mappings.OrderedFrozenSet(range(9))
new = s.union({9})
assert new == mappings.OrderedFrozenSet(range(10))
assert new == s | {9}
assert isinstance(new, mappings.OrderedFrozenSet)
def test_intersection(self):
s = mappings.OrderedFrozenSet(range(9))
new = s.intersection({1, 9})
assert new == mappings.OrderedFrozenSet({1})
assert new == s & {1, 9}
assert isinstance(new, mappings.OrderedFrozenSet)
