anchor.diff:            'email': 'removeUserNotExistsTest@example.com',
             'password': 'pswd'
           };
  -        expect(f.removeUser(credentials), throwsA((error) {
  +        expect(fbClient.removeUser(credentials), throwsA((error) {
             expect(error['code'], 'INVALID_USER');
             return true;
           }));
  
positive.code:       });
  
        test('endAt returns items when ordering by key', () {
          f.child('endAt/key/A').set('1');
          f.child('endAt/key/B').set('2');
          f.child('endAt/key/C').set('3');
          f.child('endAt/key/D').set('4');
          f.child('endAt/key/E').set('5');
  
          return f
              .child('endAt/key')
              .endAt(value: 'C')
              .orderByKey()
  
negative.code:   group('onDisconnect', () {
      test('set', () {
        var value = {'onDisconnect set': 1};
        return fbClient.onDisconnect.set(value).then((v) {
          // Unable to check value (value set upon disconnect.)
        });
      });
  