shader-slang: add hello-world test

Signed-off-by: Marcin Serwin <marcin@serwin.dev>

pkgs/by-name/sh/shader-slang/package.nix

@@ -13,6 +13,7 @@
   unordered_dense,
   versionCheckHook,
   gitUpdater,
+  runCommandCC,
 
   # Required for compiling to SPIR-V or GLSL
   withGlslang ? true,
@@ -119,9 +120,31 @@ stdenv.mkDerivation (finalAttrs: {
   versionCheckProgramArg = "-v";
   doInstallCheck = true;
 
-  passthru.updateScript = gitUpdater {
-    rev-prefix = "v";
-    ignoredVersions = "*-draft";
+  passthru = {
+    updateScript = gitUpdater {
+      rev-prefix = "v";
+      ignoredVersions = "*-draft";
+    };
+    tests.hello =
+      runCommandCC "compile-hello-world"
+        {
+          # Intermediate files generated by slangc trigger this warning
+          NIX_CFLAGS_COMPILE = "-Wno-error=format-security";
+        }
+        ''
+          cat > hello.slang << EOF
+          export __extern_cpp int main()
+          {
+              printf("Hello, world!\n");
+              return 0;
+          }
+          EOF
+
+          ${lib.getExe finalAttrs.finalPackage} hello.slang -target executable -o hello
+          ./hello | grep "Hello, world!"
+
+          touch $out
+        '';
   };
 
   meta = {