test: move the test from 3c95d44 to be within a test class

I don't think this test ever actually ran.

test/html4/test_node.rb

@@ -187,21 +187,19 @@ def test_to_html_does_not_contain_entities
             nokogiri.at("p").to_html.gsub(/ /, '')
         end
       end
-    end
 
-    def test_GH_1042
-      file = File.join(ASSETS_DIR, 'GH_1042.html');
-      html = Nokogiri::HTML(File.read(file))
-      table = html.xpath("//table")[1]
-      trs = table.xpath("tr").drop(1)
-
-      # the jruby inplementation of drop uses dup() on the IRubyObject (which
-      # is NOT the same dup() method on the ruby Object) which produces a
-      # shallow clone. a shallow of valid XMLNode triggers several
-      # NullPointerException on inspect() since loads of invariants
-      # are not set. the fix for GH1042 ensures a proper working clone.
-      assert_nothing_raised do
-        trs.inspect
+      def test_GH_1042
+        file = File.join(ASSETS_DIR, 'GH_1042.html');
+        html = Nokogiri::HTML(File.read(file))
+        table = html.xpath("//table")[1]
+        trs = table.xpath("tr").drop(1)
+
+        # the jruby inplementation of drop uses dup() on the IRubyObject (which
+        # is NOT the same dup() method on the ruby Object) which produces a
+        # shallow clone. a shallow of valid XMLNode triggers several
+        # NullPointerException on inspect() since loads of invariants
+        # are not set. the fix for GH1042 ensures a proper working clone.
+        trs.inspect # assert_nothing_raised
       end
     end
   end