import py
import extractdict

def test_extractdict():
    d = extractdict(str)
    assert 'join' in d
    saved = d['join']
    try:
        del d['join']
        assert not hasattr('', 'join')
    finally:
        d['join'] = saved

def test_typeerror():
    py.test.raises(TypeError, extractdict, 5)

class X(object):
    pass

def test_emptydict():
    x = X()
    d1 = extractdict(x)
    assert d1 is x.__dict__
    d2 = extractdict(x)
    assert d2 is d1