test: reenable mdx for tests

README.md

@@ -191,7 +191,7 @@ some text +---+
 - : unit = ()
 ```
 
-```ocaml
+```ocaml non-deterministic=command
 # let b3 = PrintBox.(
     let style = Style.(fg_color Red) in
     frame @@ grid_l [
@@ -214,10 +214,10 @@ boxes will not cut it.
 
 The advice below can be replaced by simply using `printbox.unicode` with:
 
-```ocaml
+```ocaml non-deterministic=command
 # #require "printbox.unicode";;
-# PrintBox_unicode.setup();
-````
+# PrintBox_unicode.setup();;
+```
 
 ##### The manual way
 

dune

@@ -1,7 +1,7 @@
 
-;(alias
-; (name runtest)
-; (deps README.md)
-; (action (progn
-;          (run mdx test %{deps})
-;          (diff? %{deps} %{deps}.corrected))))
+(alias
+ (name runtest)
+ (deps README.md)
+ (action (progn
+          (run mdx test %{deps})
+          (diff? %{deps} %{deps}.corrected))))

printbox.opam

@@ -15,6 +15,7 @@ depends: [
   "ocaml" { >= "4.03" }
   "uutf" {with-test}
   "uucp" {with-test}
+  "mdx" {with-test & >= "1.4" & < "1.6" }
 ]
 depopts: [
   "tyxml"