This is an on-going series of blog posts that want to answer the classical question: How is software testing done during Scrum sprints? In the first installments, Clemens Reijnen discusses the importance of having testing knowledge in the team and implementing a collaborative culture. He then presents regression testing, test automation, end-to-end testing, avoiding overlapping tests, product backlog item implementation sequence, risk and business driven tests, writing acceptance tests. Microsoft Visual Studio is used as an example of tools supporting software testing practices in Scrum sprints.