Please try the following:
Test1 t1=new Test1();
  | ArrayList<Test2> a=new ArrayList<Test2>();
  | Test2 t2=new Test2();
  | t2.setField(1);entityManager.persist(t2);a.add(t2);
  | t2=new Test2();
  | t2.setField(2);entityManager.persist(t2);a.add(t2);
  | t1.setTest2s(a);
  | t1.setField(1);
  | entityManager.persist(t1); 

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