Quality in testing means testing the application thoroughly and find all the bugs and get them fixed. Early the bug is found better will be the quality of testing.
Qualiy means meeting the customer requirments for the first time and for the everytime.this is much more that absence of defects which allows us to meet the requirments.
In addition to my previous reply Quality in testing means bug free release of application on time that fulfills all the requirements of customers and product developed under budget.