libwacom: run tests

pkgs/development/libraries/libwacom/default.nix

@@ -8,6 +8,7 @@
 , udev
 , libgudev
 , python3
+, valgrind
 }:
 
 stdenv.mkDerivation rec {
@@ -23,6 +24,10 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-9zqW6zPrFcxv/yAAtFgdVavKVMXeDBoMP3E/XriUcT0=";
   };
 
+  postPatch = ''
+    patchShebangs test/check-files-in-git.sh
+  '';
+
   nativeBuildInputs = [
     pkg-config
     meson
@@ -36,10 +41,20 @@ stdenv.mkDerivation rec {
     libgudev
   ];
 
+  doCheck = stdenv.hostPlatform == stdenv.buildPlatform;
+
   mesonFlags = [
-    "-Dtests=disabled"
+    "-Dtests=${if doCheck then "enabled" else "disabled"}"
   ];
 
+  nativeCheckInputs = [
+    valgrind
+  ] ++ (with python3.pkgs; [
+    libevdev
+    pytest
+    pyudev
+  ]);
+
   meta = with lib; {
     platforms = platforms.linux;
     homepage = "https://linuxwacom.github.io/";