def METHOD_NAME(self):
    shared_server = fakeredis.FakeServer()
    r1 = fakeredis.FakeRedis()
    r2 = fakeredis.FakeRedis(server=fakeredis.FakeServer())
    r3 = fakeredis.FakeRedis(server=shared_server)
    r4 = fakeredis.FakeRedis(server=shared_server)
    r1.set('foo', 'bar')
    r3.set('bar', 'baz')
    assert 'foo' in r1
    assert 'foo' not in r2
    assert 'foo' not in r3
    assert 'bar' in r3
    assert 'bar' in r4
    assert 'bar' not in r1