https://docs.spring.io/spring-framework/reference/testing/mockmvc.html
    MockMvc can be used on its own to perform requests and verify responses using Hamcrest 
    or through MockMvcTester which provides a fluent API using AssertJ
https://docs.spring.io/spring-framework/reference/testing/mockmvc/assertj.html
https://docs.spring.io/spring-framework/reference/testing/mockmvc/assertj/setup.html
https://docs.spring.io/spring-framework/reference/testing/mockmvc/assertj/requests.html

2023
https://habr.com/ru/companies/otus/articles/747852/
https://habr.com/ru/companies/otus/articles/746414/
2021
https://www.baeldung.com/integration-testing-in-spring
2017
TechPrimers - Unit and Integration Tests in Spring Boot JPA Example of 13:59
    https://www.youtube.com/watch?v=ackhP0ubtd4