[rubygems/rubygems] Added test for

https://github.com/rubygems/rubygems/pull/6444

https://github.com/rubygems/rubygems/commit/7d6ece5c92

test/rubygems/test_gem_specification.rb

@@ -3663,6 +3663,22 @@ end
     refute @a1.missing_extensions?
   end
 
+  def test_missing_extensions_eh_local_gemspec
+    pend "extensions don't quite work on jruby" if Gem.java_platform?
+
+    spec = new_default_spec "default", 1
+    spec.extensions << "extconf.rb"
+
+    ext_spec
+    @ext.name = spec.name
+    FileUtils.mkdir_p File.join(@ext.gem_dir, "lib")
+
+    # ext_spec used empty extconf.rb, so we need to create dummy extension for rake-compiler case.
+    FileUtils.touch File.join(@ext.gem_dir, "lib", "#{@ext.name}.#{RbConfig::CONFIG['DLEXT']}")
+
+    refute @ext.missing_extensions?
+  end
+
   def test_find_all_by_full_name
     pl = Gem::Platform.new "i386-linux"