Core: Add a test suite (#9297)

Adds a test suite for testing hyprland's features with a runtime tester

---------

Co-authored-by: Mihai Fufezan <mihai@fufexan.net>

nix/hyprtester.nix

@@ -0,0 +1,58 @@
+{
+  lib,
+  stdenv,
+  stdenvAdapters,
+  cmake,
+  pkg-config,
+  hyprland,
+  hyprwayland-scanner,
+  version ? "git",
+}: let
+  inherit (lib.lists) flatten foldl';
+  inherit (lib.sources) cleanSourceWith cleanSource;
+  inherit (lib.strings) hasSuffix;
+
+  adapters = flatten [
+    stdenvAdapters.useMoldLinker
+    stdenvAdapters.keepDebugInfo
+  ];
+
+  customStdenv = foldl' (acc: adapter: adapter acc) stdenv adapters;
+in
+  customStdenv.mkDerivation (finalAttrs: {
+    pname = "hyprtester";
+    inherit version;
+
+    src = cleanSourceWith {
+      filter = name: _type: let
+        baseName = baseNameOf (toString name);
+      in
+        ! (hasSuffix ".nix" baseName);
+      src = cleanSource ../.;
+    };
+
+    nativeBuildInputs = [
+      cmake
+      pkg-config
+      hyprwayland-scanner
+    ];
+
+    buildInputs = hyprland.buildInputs;
+
+    preConfigure = ''
+      cmake -S . -B .
+      cmake --build . --target generate-protocol-headers -j`nproc 2>/dev/null || getconf NPROCESSORS_CONF`
+
+      cd hyprtester
+    '';
+
+    cmakeBuildType = "Debug";
+
+    meta = {
+      homepage = "https://github.com/hyprwm/Hyprland";
+      description = "Hyprland testing framework";
+      license = lib.licenses.bsd3;
+      platforms = hyprland.meta.platforms;
+      mainProgram = "hyprtester";
+    };
+  })