The guide advises to name tests:

(deftest foo-test ...)

But functions as

(defn foo ...)

Shouldn't it be:

(defn foo-function ...)

to be consistent?

However, there is no need postfix testnames with -test, since the tests are marked in their meta-data, and the test runner can locate them this way. Clojure does not locate tests by name, such as is the case in Python and Javascript, for example, where this is required.