This guide is intended for future IT professionals who need to know the basics of software testing. The purpose of the manual is to reconsider the attitude of future developers to the quality of modern software. Examines testing methods, software specifications, documentation, unit testing in IntelliJ IDEA, MS Visual Studio environments, examines software development methods based on testing (TDD) and behavior (BDD) in the IDEA environment in Java, discusses functional automated testing in the IBM Rational Tester environment, gives an overview of Web testing - applications using Selenium.