modify tests to add foreach

tests/wpt/web-platform-tests/url/urlsearchparams-foreach.html

@@ -22,6 +22,11 @@
                 break;
         }
     });
+    var found = [];
+    params.forEach(function(value, index) {
+        found.push(value);
+    });
+    assert_array_equals(found,['1', '2', '3']);
 }, "ForEach Check");
 
 test(function(){