output-template: run the tests

pkgs/output-template/Makefile

@@ -1,3 +0,0 @@
-check:
-	./output-template  '{{' '}}' < example.ini > output
-	diff -u output example.ini.expected

pkgs/output-template/default.nix

@@ -2,6 +2,7 @@
   fetchurl,
   writeFennel,
   fennel,
+  fennelrepl,
   runCommand,
   lua,
   anoia,
@@ -17,9 +18,9 @@ stdenv.mkDerivation {
   src = ./.;
 
   buildInputs = [ lua ];
-  doCheck = true;
-
+  nativeBuildInputs = [ fennelrepl ] ;
   buildPhase = ''
+    fennelrepl --test ./output-template.fnl
     cp -p ${
       writeFennel name {
         packages = [
@@ -27,11 +28,11 @@ stdenv.mkDerivation {
           lualinux
           linotify
         ];
+        macros = [ anoia.dev ];
         mainFunction = "run";
       } ./output-template.fnl
     } ${name}
   '';
-  checkPhase = "make check";
   installPhase = ''
     install -D ${name} $out/bin/${name}
   '';

pkgs/output-template/output-template.fnl

@@ -41,4 +41,12 @@
         out (substitute (: (io.input) :read "*a") opening closing)]
     (io.write out)))
 
+(import-macros { : define-tests : expect : expect= } :anoia.assert)
+(define-tests
+  (fn slurp [name]
+    (with-open [f (assert (io.open name))] (f:read "*a")))
+  (expect=
+   (pick-values 1 (substitute (slurp "example.ini")  "{{" "}}"))
+   (slurp "example.ini.expected")))
+
 { : run }