}
	wg.Wait()

	var find User
	err = db.Preload(clause.Associations).Where("id = ?", user.ID).First(&find).Error
	AssertEqual(t, err, nil)
	AssertAssociationCount(t, find, "Languages", int64(count), "after concurrent append")
}

func TestMany2ManyDuplicateBelongsToAssociation(t *testing.T) {
	user1 := User{Name: "TestMany2ManyDuplicateBelongsToAssociation-1", Friends: []*User{