'Create index locator with 3 base, 4 offset. and change it to something
else. See if change was successful.
Should not exception.'

def test_set_params(self):

    index = mticker.IndexLocator(base=3, offset=4)
    index.set_params(base=7, offset=7)
    assert (index._base == 7)
    assert (index.offset == 7)
