def METHOD_NAME(self):
    ts = msprime.simulate(50, random_seed=1)
    ts = tsutil.jukes_cantor(ts, 5, 2, seed=2)
    num_silent = 0
    for m in ts.mutations():
        if (
            m.parent != -1
            and ts.mutation(m.parent).derived_state == m.derived_state
        ):
            num_silent += 1
    assert num_silent > 20