Set<Set<Set<Object>>> two = powerSet(one);
    Set<Set<Set<Set<Object>>>> four = powerSet(two);
    Set<Set<Set<Set<Set<Object>>>>> sixteen = powerSet(four);
    Set<Set<Set<Set<Set<Set<Object>>>>>> sixtyFiveThousandish = powerSet(sixteen);
    assertEquals(1 << 16, sixtyFiveThousandish.size());

    assertTrue(powerSet(makeSetOfZeroToTwentyNine()).contains(makeSetOfZeroToTwentyNine()));

* Add missing dependencies for testing. PR [#1026](https://github.com/tiangolo/fastapi/pull/1026) by [@sm-Fifteen](https://github.com/sm-Fifteen).

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