Visual Studio：未为签名的程序集生成代码覆盖率(Visual Studio: Code coverage not generated for signed assemblies)

 这就解决了我的问题： 
 
 用户 ： 
 
id      username        password
1       user1           ********
2       user2           ********
3       user3           ********
4       user4           ********
5       user5           ********
6       user6           ********
 
 用户连接 ： 
 
pivot_id    parent_user_id  child_user_id   relation
1           1               2               child
2           2               1               parent
3           1               3               child
4           3               1               parent
5           3               4               child
6           4               3               parent
7           3               5               child
8           5               3               parent
 
class User extends Model
{
    public function connections()
    {
        return $this->belongsToMany('App\Newsroom','UserConnections','parent_user_id','child_user_id')->with(['user']);
    }
}

class UserConnection extends Model
{
    public function user()
    {
        $this->belongsTo('App\User','child_user_id');
    }
}
 
 感谢@Autista_z 

This is what solved my problem:
 
User:
 
id      username        password
1       user1           ********
2       user2           ********
3       user3           ********
4       user4           ********
5       user5           ********
6       user6           ********
 
UserConnections:
 
pivot_id    parent_user_id  child_user_id   relation
1           1               2               child
2           2               1               parent
3           1               3               child
4           3               1               parent
5           3               4               child
6           4               3               parent
7           3               5               child
8           5               3               parent
 
class User extends Model
{
    public function connections()
    {
        return $this->belongsToMany('App\Newsroom','UserConnections','parent_user_id','child_user_id')->with(['user']);
    }
}

class UserConnection extends Model
{
    public function user()
    {
        $this->belongsTo('App\User','child_user_id');
    }
}
 
Thanks to @Autista_z