def test_set_parent_bad_type():
x = Locus('1',1,2)
with pytest.raises(LocusError):
x.parent = 12
def test_get_parent():
x = Locus('1',1,2)
y = Locus('1',3,4)
x.parent = y
assert x.parent == y
def test_set_parent_bad_type():
x = Locus('1',1,2)
with pytest.raises(LocusError):
x.parent = 12
def test_get_parent():
x = Locus('1',1,2)
y = Locus('1',3,4)
x.parent = y
assert x.parent == y