use nix-unit from nixpkgs

lib/jsonschema/flake-module.nix

@@ -1,5 +1,5 @@
 {
-  perSystem = { pkgs, self', ... }: {
+  perSystem = { pkgs, ... }: {
     checks = {
 
       # check if the `clan config` example jsonschema and data is valid
@@ -19,7 +19,7 @@
       # check if the `clan config` nix jsonschema converter unit tests succeed
       lib-jsonschema-nix-unit-tests = pkgs.runCommand "lib-jsonschema-nix-unit-tests" { } ''
         export NIX_PATH=nixpkgs=${pkgs.path}
-        ${self'.packages.nix-unit}/bin/nix-unit \
+        ${pkgs.nix-unit}/bin/nix-unit \
           ${./.}/test.nix \
           --eval-store $(realpath .)
         touch $out

pkgs/clan-cli/flake-module.nix

@@ -30,8 +30,7 @@
     in
     {
       devShells.clan-cli = pkgs.callPackage ./shell.nix {
-        inherit (self'.packages) clan-cli nix-unit;
-        # inherit (inputs) democlan;
+        inherit (self'.packages) clan-cli;
       };
       packages = {
         clan-cli = pkgs.python3.pkgs.callPackage ./default.nix {

pkgs/flake-module.nix

@@ -13,7 +13,6 @@
         inherit (config.packages) tea-create-pr;
       };
       pending-reviews = pkgs.callPackage ./pending-reviews { };
-      nix-unit = pkgs.callPackage ./nix-unit { };
       meshname = pkgs.callPackage ./meshname { };
     } // lib.optionalAttrs pkgs.stdenv.isLinux {
       aemu = pkgs.callPackage ./aemu { };

pkgs/nix-unit/default.nix

@@ -1,50 +0,0 @@
-{ stdenv
-, lib
-, nixVersions
-, fetchFromGitHub
-, nlohmann_json
-, boost
-, meson
-, pkg-config
-, ninja
-, cmake
-, clang-tools
-, difftastic
-, makeWrapper
-}:
-
-stdenv.mkDerivation {
-  pname = "nix-unit";
-  version = "0.1";
-  src = fetchFromGitHub {
-    owner = "adisbladis";
-    repo = "nix-unit";
-    rev = "7e2ee1c70f930b9b65b9fc33c3f3eca0dfae00d1";
-    sha256 = "sha256-UaUkh+/lxzNCRH64YB6SbyRIvvDhgY98izX9CvWgJA4=";
-  };
-  buildInputs = [
-    nlohmann_json
-    nixVersions.nix_2_18
-    boost
-  ];
-  nativeBuildInputs = [
-    meson
-    pkg-config
-    ninja
-    # nlohmann_json can be only discovered via cmake files
-    cmake
-    makeWrapper
-  ] ++ (lib.optional stdenv.cc.isClang [ clang-tools ]);
-
-  postInstall = ''
-    wrapProgram "$out/bin/nix-unit" --prefix PATH : ${difftastic}/bin
-  '';
-
-  meta = {
-    description = "Nix unit test runner";
-    homepage = "https://github.com/adisbladis/nix-unit";
-    license = lib.licenses.gpl3;
-    maintainers = with lib.maintainers; [ adisbladis ];
-    platforms = lib.platforms.unix;
-  };
-}