title: TypeORM OneToMany relationship in the same entity
body: <p>I am struggling with creating a OneToMany relationship with the same entity. Is it possible in TypeORM?</p>
  
  <p>Assuming I have an entity:</p>
  
  <pre><code>export class X {
    @PrimaryGeneratedColumn()
    id: number;
  
    @OneToMany( what here???? ) 
    tests: X[];
  }
  </code></pre>
  
  <p>Can somebody help me? Thanks in advance.</p>