test_link.py 文件源码

def test_sets():
    a = Link('foo', 'bar', 'doz')
    b = Link('foo', 'bar', 'doz')
    c = Link('42')

    assert isinstance(a, collections.Hashable)
    assert hash(a) == hash(b)
    assert hash(b) != hash(c)

    s1 = set([a])
    s2 = set([b])
    s3 = set([c])

    assert (s1 - s2) == set()
    assert (s1 | s2) == set([a])
    assert (s1 | s2 | s3) == set([a,b,c])
    assert ((s1 | s2 | s3) - s1) == set([c])