https://github.com/rieckpil/testing-spring-boot-applications-primer/blame/214683e3bcd91e00d3125c38c59f5688bcea73a3/src/test/java/de/rieckpil/blog/exercise11/BasicIT.java#L33 Since, GET request has no body in this example, `List<Customer>` in `HttpEntity<List<Customer>>` is redundant instead `Void` can be used.
https://github.com/rieckpil/testing-spring-boot-applications-primer/blame/214683e3bcd91e00d3125c38c59f5688bcea73a3/src/test/java/de/rieckpil/blog/exercise11/BasicIT.java#L33
Since, GET request has no body in this example,
List<Customer>inHttpEntity<List<Customer>>is redundant insteadVoidcan be used.