clojure.test unable to resolve symbol from `eval`. Works in REPL and lein run - testing

Question

Please bear with this contrived example but it was the simplest thing I could think of to recreate the issue.
(ns something.core)
(defn call-foo [something & args]
(let [a-foo (:foo (eval (:quux something)))]
(apply a-foo args)))
(def Something {
:foo (fn [& args] args)
:bar (fn [something] (call-foo something))
})
(defn make-something []
{:quux 'Something})
Running the following in the REPL or with lein run works well.
(let [subject (make-something)
actual (call-foo subject "hello" "greetings")]
(println actual))
;;=> (hello greetings)
The problem occurs only during this test and executing lein test:
(ns something.core-test
(:require [clojure.test :refer :all]
[something.core :refer :all]))
(deftest a-test
(let [subject (make-something)
actual (call-foo subject "hello" "greetings")]
(is (= ["hello" "greetings"] actual))))
This throws an error. An example output:
ERROR in (a-test) (Compiler.java:6464)
Uncaught exception, not in assertion.
expected: nil
actual: clojure.lang.Compiler$CompilerException: java.lang.RuntimeException: Unable to resolve symbol: Something in this context, compiling:(/private/var/folders/0n/c7q7860j34xfc2r1x4q51jrh0000gn/T/form-init9215140948330409114.clj:1:6436)
The line "Unable to resolve symbol: Something in this context" makes me think Something is not in context for some reason while I eval in call-foo. But why is this the case only in the test?

Answer 1

The problem is that eval does not see context. Your 'Something resolves in something.core and something.core-test since you have refered all. It won't resolve from whatever namespace where lein test runs its tests.
To fix the immediate problem change
'Something
to
`Something
so that it is namespace-qualified. The test will then run (and fail), but that's another issue (println returns nil for one thing).