This article deals with planning language tests and discusses the eligibility criteria for a good language test. At the beginning, the author gives a definition of a language test and attempts to answer the question what the aim of teachers testing their students is. Then, she outlines the general division of language tests, dividing them due to their intended purpose and, at the same time, discussing each of the mentioned type. In addition, she gives specific criteria for the correctness of a language test in the analysis of such key features as validity, reliability, practicality and objectivity. She also provides practical examples of the most common mistakes while planning a teaching language test.