public async Task Delete()
{
await user1.Unfollow(user2.ObjectId);
// 查询好友
Assert.AreEqual((await GetFriends()).Count, 0);
}
public async Task Unfollow()
{
await LCUser.BecomeWithSessionToken(user2.SessionToken);
await user2.Unfollow(user1.ObjectId);
await LCUser.BecomeWithSessionToken(user3.SessionToken);
await user3.Unfollow(user1.ObjectId);
}