Arquillian is an example of a test tool that allows a level of testing closer to integration testing than unit testing together with mocking allows. Arquillian is specific to Java application servers, such as WildFly. Arquillian is interesting because it illustrates the struggle of reaching a closer approximation of production systems during testing. You can reach such approximations in any number of ways, and the road to there is filled with trade-offs.
There is a hello world style demonstration of Arquillian in the book's source code archive.
