haskellPackages.changelog-d: Add basic test

pkgs/development/misc/haskell/changelog-d/default.nix

@@ -3,7 +3,7 @@
 , pkgs
 }:
 
-(callPackage ./changelog-d.nix { }).overrideAttrs (oldAttrs: {
+(callPackage ./changelog-d.nix { }).overrideAttrs (finalAttrs: oldAttrs: {
 
   version = oldAttrs.version + "-git-${lib.strings.substring 0 7 oldAttrs.src.rev}";
 
@@ -17,6 +17,31 @@
       cabal2nix https://codeberg.org/fgaz/changelog-d >changelog-d.nix
     '';
   });
+  passthru.tests = {
+    basic = pkgs.runCommand "changelog-d-basic-test" {
+        nativeBuildInputs = [ finalAttrs.finalPackage ];
+      } ''
+        mkdir changelogs
+        cat > changelogs/config <<EOF
+        organization: NixOS
+        repository: boondoggle
+        EOF
+        cat > changelogs/a <<EOF
+        synopsis: Support numbers with incrementing base-10 digits
+        issues: #1234
+        description: {
+        This didn't work before.
+        }
+        EOF
+        changelog-d changelogs >$out
+        cat -n $out
+        echo Checking the generated output
+        set -x
+        grep -F 'Support numbers with incrementing base-10 digits' $out >/dev/null
+        grep -F 'https://github.com/NixOS/boondoggle/issues/1234' $out >/dev/null
+        set +x
+      '';
+  };
 
   meta = oldAttrs.meta // {
     homepage = "https://codeberg.org/fgaz/changelog-d";