phillip.l...@newcastle.ac.uk (Phillip Lord) writes:

> I know about *warn-on-reflection* but is there anyway that I can get
> an error-on-reflection instead?

I don't think so.

> I've been type hinting my application (50% done and yes it goes faster
> now), and it's a bit painful. What I would really want is to have a
> unit test which fails if reflection is used.
>
> So far, my best idea is catching standard-out and parsing it for
> reflection warnings. Not ideal.

clojure/test/clojure/test_helper.clj already contains some helper macros
for doing that, e.g., `should-not-reflect`:

https://github.com/clojure/clojure/blob/0b73494c3c855e54b1da591eeb687f24f608f346/test/clojure/test_helper.clj#L126

One problem is, though, that you not only get reflection warnings for
your own code but also for code in dependencies.  So you need to tweak
that macro with another regex that matches only reflection warnings in
your own files.  But then you should be able to do something like this:

--8<---------------cut here---------------start------------->8---
(ns myproject.test
  :require [clojure.test :as test])

(defmacro should-not-reflect ...)
  
(test/deftest no-reflection-at-all
  (should-not-reflect
    (do
      (require 'myproject.ns1 :reload)
      (require 'myproject.ns2 :reload)
      ...)))
--8<---------------cut here---------------end--------------->8---

HTH,
Tassilo

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