async def METHOD_NAME(self):
    one1 = await self.UUIDPkModel.create()
    one2 = await self.UUIDPkModel.create()
    two1 = await self.UUIDM2MRelatedModel.create()
    two2 = await self.UUIDM2MRelatedModel.create()
    await one1.peers.add(two1, two2)
    await one2.peers.add(two1, two2)
    self.assertEqual(set(await one1.peers), {two1, two2})
    self.assertEqual(set(await one2.peers), {two1, two2})
    self.assertEqual(set(await two1.models), {one1, one2})
    self.assertEqual(set(await two2.models), {one1, one2})