If project development goes this way then project manager's tension builds up and the estimates goes haywire. Release date gets extended by days, weeks and sometimes by a month or two. However, this kind of situations can be avoided if few things are taken into consideration:

• Functionality of the application to be developed should be clear and well documented with a support of good change management process
• Development phase of the project should be completed
• Test cases must cover entire functionality of the application and they must be executed in a controlled environment
• A robust process for determining the severity and priority of defect
• Carrying out analysis of testing phase --> No. defects found against no. of test cases executed. If application is in second stage of testing then no. of defects reoccurred, time taken for fixing up of defects according their severity.

So what do you think how a software testing can become a success story in large no. of applications?

Reference:
>> Inside the Software Testing Quagmire

Related:
>> Is Software Testing, a never-ending story?
>> Complex Software = More Bugs
>> How to achieve zero defects software quality?
>> Can software be defect free?