anchor.diff:    User u = new User();
     u.givenName = 'Sergey';
     u.familyName = 'Ustimenko';
  +  u.weight = 123.456;
     await u.save();
   
     // that should give him an 'id', so lets use that id to find him
  
positive.code:   String familyName;
  
    @ORM.DBField()
    DateTime created;
  
    String toString() {
      return 'User { id: $id, ' +
      'givenName: \'$givenName\', familyName: \'$familyName\' }';
    }
  }
  
  
negative.code:   expect(u.id, savedFound.id);
    expect(u.givenName, savedFound.givenName);
    expect(u.familyName, savedFound.familyName);
    expect(u.weight, savedFound.weight);
  
    // now lets change some properties for both instances
    savedFound.givenName = 'yegreS';
    savedFound.familyName = 'oknemitsU';
    savedFound.weight = 234.567;
  
    await savedFound.save();
  
  