def test_children_detach_in_children_setter():
x = Locus('1',1,2)
y = Locus('1',3,4,name='sublocus1')
z = Locus('1',3,4,name='sublocus2')
x.children = [y]
# Now trigger a detach for current children
# when assigning new children
x.children = [z]
assert len(x.children) == 1
def test_children_len():
x = Locus('1',1,2)
y = Locus('1',3,4,name='sublocus1')
z = Locus('1',3,4,name='sublocus2')
x.children = (y,z)
assert len(x.children) == 2
