Comment made by: alexmiller
It's explained in the clojure.test ns docstring in more depth:
Fixtures are attached to namespaces in one of two ways. \"each\"
fixtures are run repeatedly, once for each test function created
with \"deftest\" or \"with-test\". \"each\" fixtures are useful for
establishing a consistent before/after state for each test, like
clearing out database tables.
\"each\" fixtures can be attached to the current namespace like this:
(use-fixtures :each fixture1 fixture2 ...)
The fixture1, fixture2 are just functions like the example above.
They can also be anonymous functions, like this:
(use-fixtures :each (fn [f] setup... (f) cleanup...))
The other kind of fixture, a \"once\" fixture, is only run once,
around ALL the tests in the namespace. \"once\" fixtures are useful
for tasks that only need to be performed once, like establishing
database connections, or for time-consuming tasks.
Attach \"once\" fixtures to the current namespace like this:
(use-fixtures :once fixture1 fixture2 ...)
I'm not really answering your question, just wondering if you saw that and whether it changes your question.