I've made a series of test stories from my favorite test runs. During this test run I used the card sorting method and interviews so that a web shop could optimize their product categorization, sorting and filtering.
The short answer: A lot. In December 2015 I was called to the offices of a project, who went live with their website the month before. On the website, customers could search for and buy products that could be sent to other people via both physical and virtual shipping channels. And they wanted me to test the "user experience" of the website on different platforms and devices.