def test_update():
a = sdict()
a.update(dict(a=[1, 2], b=[3, 4], c=[1, 4]))
assert a == {'a': set([1, 2]), 'b': set([3, 4]), 'c': set([1, 4])}
a = sdict()
a.update([('a', [1, 2]), ('b', [3, 4]), ('c', [1, 4])])
assert a == {'a': set([1, 2]), 'b': set([3, 4]), 'c': set([1, 4])}
a = sdict()
a.update([('a', [1, 2])], b=[3, 4], c=[1, 4])
assert a == {'a': set([1, 2]), 'b': set([3, 4]), 'c': set([1, 4])}
a = sdict()
a.update(a=[1, 2], b=[3, 4], c=[1, 4])
assert a == {'a': set([1, 2]), 'b': set([3, 4]), 'c': set([1, 4])}
def test_union():
b = sdict({1: ['d'], 3: ['b'], 4: ['c', 'b']})
c = b.union()
assert c == set(['d', 'b', 'c'])
def test_delete():
b = sdict({1: ['a', 'd'], 2: ['a'], 3: ['b'], 4: ['c', 'b']})
removed_from, deleted = b.delete('a')
assert removed_from == set([1, 2])
assert deleted == set([2])
assert b == {1: set(['d']), 3: set(['b']), 4: set(['c', 'b'])}
def test_setitem():
b = sdict({1: ['a', 'c'], 2: ['a'], 3: ['b'], 4: ['c', 'b']})
b[1] = ['a', 'd']
assert b == {1: set(['a', 'd']), 2: set(['a']), 3: set(['b']),
4: set(['c', 'b'])}
def test_switched():
a = sdict(a=[1, 2], b=[3, 4], c=[1, 4])
b = a.switched()
assert b == {1: set(['a', 'c']), 2: set(['a']), 3: set(['b']),
4: set(['c', 'b'])}