Interviewers are interested in hiring candidates who not only have the right skills and experience for the job but can quickly assimilate into their team. They will ask you about your experience with testing tools to determine if you are familiar with the tools they currently use and can begin contributing to their test requirements soon after joining the organization. Learning as much as you can about the organization's tools will help you respond to this question effectively. You may also want to consider a strategy of recommending tools you've used in your previous jobs to help the company improve its operations.