More accurate to call this test design and execution, the second part of the exercise asks you to carry out the test. Having tried this exercise myself, I haven't even gotten to executing the tests. I feel like the test design activity can easily take up the 20 minutes (or more, depending on how detailed you go), mapping out what you want to test and reflecting on the why.
URL: https://www.fourhourtester.net/exercises/Testdesign.html
More accurate to call this test design and execution, the second part of the exercise asks you to carry out the test. Having tried this exercise myself, I haven't even gotten to executing the tests. I feel like the test design activity can easily take up the 20 minutes (or more, depending on how detailed you go), mapping out what you want to test and reflecting on the why.