Re-enable npm run test for renamed head-wasip2 package by fixing Bundler standalone compatibility

lib/ruby_wasm/packager/core.rb

@@ -221,9 +221,49 @@ def _build_gem_exts(executor, build, gem_home)
       ]
 
       executor.system(*args, env: env)
+      patch_bundler_standalone_setup(local_path)
       executor.cp_r(local_path, gem_home)
     end
 
+    # Bundler standalone setup.rb assumes that once `Gem` is defined,
+    # Gem.ruby_api_version and Gem.extension_api_version are also available.
+    # In ruby-head packaging this assumption can fail (Gem exists, but these
+    # API-version helpers are missing), so we inject a compatibility shim
+    # before Bundler's load-path setup runs.
+    def patch_bundler_standalone_setup(local_path)
+      setup_rb = File.join(local_path, "bundler", "setup.rb")
+      return unless File.file?(setup_rb)
+
+      content = File.read(setup_rb)
+      marker = "# ruby.wasm compatibility shim for missing Gem API version methods"
+      return if content.include?(marker)
+
+      shim = <<~RUBY
+        #{marker}
+        if defined?(Gem)
+          module Gem
+            def self.ruby_api_version
+              RbConfig::CONFIG["ruby_version"]
+            end unless respond_to?(:ruby_api_version)
+
+            def self.extension_api_version
+              if "no" == RbConfig::CONFIG["ENABLE_SHARED"]
+                "\#{ruby_api_version}-static"
+              else
+                ruby_api_version
+              end
+            end unless respond_to?(:extension_api_version)
+          end
+        end
+      RUBY
+
+      patched = content.sub(/^require 'rbconfig'\n/, "require 'rbconfig'\n#{shim}\n")
+      return if patched == content
+
+      RubyWasm.logger.info("Patching #{setup_rb} for RubyGems API compatibility")
+      File.write(setup_rb, patched)
+    end
+
     def cache_key(digest)
       derive_build.cache_key(digest)
     end

packages/npm-packages/ruby-head-wasm-wasip2/package.json

@@ -30,7 +30,7 @@
     "README.md"
   ],
   "scripts": {
-    "FIXME_SKIP_test": "RUBY_NPM_PACKAGE_ROOT=../ruby-head-wasm-wasip2 ENABLE_COMPONENT_TESTS=1 npm -C ../ruby-wasm-wasi run test:run",
+    "test": "RUBY_NPM_PACKAGE_ROOT=../ruby-head-wasm-wasip2 ENABLE_COMPONENT_TESTS=1 npm -C ../ruby-wasm-wasi run test:run",
     "build:deps": "cd ../ruby-wasm-wasi && npm run build",
     "build:static:files": "../ruby-wasm-wasi/tools/pack-static-files.sh ./dist",
     "build:static": "npm run build:static:files",

sig/ruby_wasm/packager.rbs

@@ -81,6 +81,7 @@ class RubyWasm::Packager
       def name: () -> string
 
       private def _build_gem_exts: (RubyWasm::BuildExecutor, RubyWasm::Build, string gem_home) -> void
+      private def patch_bundler_standalone_setup: (string local_path) -> void
       private def _link_gem_exts: (RubyWasm::BuildExecutor, RubyWasm::Build, string ruby_root, string gem_home, bytes module_bytes) -> bytes
     end