lein midje coudn't locate some file - unit-testing

Question

I'm trying to do unit-testing using midje, and I hit some wall.
Assuming I have this directory structure:
├── src
│   └── clj
│   └── faris
│   └── lune
│   ├── core.clj
│   ├── index
│   │   ├── comment.clj
│   │   └── place.clj
│   ├── middleware
│      └── core.clj
└── test
└── clj
└── faris
└── lune
└── middleware
└── t_core.clj
which .../faris/lune/middleware/t_core.clj contains a simple test:
(ns faris.lune.middleware.t-core
(:require [faris.lune.middleware.core :refer :all]
[midje.sweet :refer :all]))
(fact "simple test"
(+ 1 1) => 2)
It always fail with the following error message:
Exception in thread "main" java.io.FileNotFoundException: Could not locate faris/lune/middleware/t_core__init.class or faris/lune/middleware/t_core.clj on classpath: , compiling:(/tmp/form-init2527989536148890974.clj:1:90)
at clojure.lang.Compiler.load(Compiler.java:7142)
at clojure.lang.Compiler.loadFile(Compiler.java:7086)
at clojure.main$load_script.invoke(main.clj:274)
at clojure.main$init_opt.invoke(main.clj:279)
at clojure.main$initialize.invoke(main.clj:307)
at clojure.main$null_opt.invoke(main.clj:342)
at clojure.main$main.doInvoke(main.clj:420)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at clojure.lang.Var.invoke(Var.java:383)
at clojure.lang.AFn.applyToHelper(AFn.java:156)
at clojure.lang.Var.applyTo(Var.java:700)
at clojure.main.main(main.java:37)
Caused by: java.io.FileNotFoundException: Could not locate faris/lune/middleware/t_core__init.class or faris/lune/middleware/t_core.clj on classpath:
at clojure.lang.RT.load(RT.java:443)
at clojure.lang.RT.load(RT.java:411)
at clojure.core$load$fn__5066.invoke(core.clj:5641)
at clojure.core$load.doInvoke(core.clj:5640)
at clojure.lang.RestFn.invoke(RestFn.java:408)
at clojure.core$load_one.invoke(core.clj:5446)
at clojure.core$load_lib$fn__5015.invoke(core.clj:5486)
at clojure.core$load_lib.doInvoke(core.clj:5485)
at clojure.lang.RestFn.applyTo(RestFn.java:142)
at clojure.core$apply.invoke(core.clj:626)
at clojure.core$load_libs.doInvoke(core.clj:5524)
at clojure.lang.RestFn.applyTo(RestFn.java:137)
at clojure.core$apply.invoke(core.clj:626)
at clojure.core$require.doInvoke(core.clj:5607)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at midje.repl$load_facts$fn__7983.invoke(repl.clj:206)
at midje.repl$load_facts.doInvoke(repl.clj:192)
at clojure.lang.RestFn.invoke(RestFn.java:397)
at user$eval8046.invoke(form-init2527989536148890974.clj:1)
at clojure.lang.Compiler.eval(Compiler.java:6703)
at clojure.lang.Compiler.eval(Compiler.java:6693)
at clojure.lang.Compiler.load(Compiler.java:7130)
... 11 more
Subprocess failed
Which is very cryptic to me, since it was like midje found the the test file, read the ns (faris.lune.middleware.t-core) and then saying it can't find it.
Any help? I must be missing something obvious.