The blockсhain is the technology of the future. It increasingly affects various areas of activity, from finance to medicine. Therefore, there are more and more applications based on the blockchain, and the more often we have the opportunity to test such applications. My talk for those who have not yet started testing the blockchain, but wants to know more about it. In the talk, you will learn about the blockchain technology, about smart contracts and ICO, their features and what tools you should use for testing the blockchain applications.