wasilibc: build firefox in passthru.tests

pkgs/development/libraries/wasilibc/default.nix

@@ -1,4 +1,10 @@
-{ stdenv, buildPackages, fetchFromGitHub, lib }:
+{ stdenv
+, buildPackages
+, fetchFromGitHub
+, lib
+, firefox-unwrapped
+, firefox-esr-unwrapped
+}:
 
 let
   pname = "wasilibc";
@@ -44,6 +50,10 @@ stdenv.mkDerivation {
     ln -s $share/share/undefined-symbols.txt $out/lib/wasi.imports
   '';
 
+  passthru.tests = {
+    inherit firefox-unwrapped firefox-esr-unwrapped;
+  };
+
   meta = with lib; {
     changelog = "https://github.com/WebAssembly/wasi-sdk/releases/tag/wasi-sdk-${version}";
     description = "WASI libc implementation for WebAssembly";