bindings: Fixes layouttests when moving attributes to prototype chains.

LayoutTests/resources/testharness.js

 /*global self*/
 /*jshint latedef: nofunc*/
 /*
 Distributed under both the W3C Test Suite License [1] and the W3C
 3-clause BSD License [2]. To contribute to a W3C Test Suite, see the
 policies and contribution forms [3].
 
 [1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
 [2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
 [3] http://www.w3.org/2004/10/27-testcases
@@ skipping 372 matching lines @@
  *   assert that object has own property property_name
  *
  * assert_inherits(object, property_name, description)
  *   assert that object does not have an own property named property_name
  *   but that property_name is present in the prototype chain for object
  *
  * assert_idl_attribute(object, attribute_name, description)
  *   assert that an object that is an instance of some interface has the
  *   attribute attribute_name following the conditions specified by WebIDL
  *
+ * assert_will_be_idl_attribute(object, attribute_name, description)
+ *   assert that an object that is an instance of some interface has the
+ *   attribute attribute_name following the conditions specified by WebIDL,
+ *   but it's acceptable that the attribute attribute_name is an own property
+ *   of the object because we're in the middle of moving the attribute to
+ *   a prototype chain.
+ *
  * assert_readonly(object, property_name, description)
  *   assert that property property_name on object is readonly
  *
  * assert_throws(code, func, description)
  *   code - the expected exception:
  *     o string: the thrown exception must be a DOMException with the given
  *               name, e.g., "TimeoutError" (for compatibility with existing
  *               tests, a constant is also supported, e.g., "TIMEOUT_ERR")
  *     o object: the thrown exception must have a property called "name" that
  *               matches code.name
@@ skipping 941 matching lines @@
 
             assert(property_name in object,
                    name, description,
                    "property ${p} not found in prototype chain",
                    {p:property_name});
         };
     }
     expose(_assert_inherits("assert_inherits"), "assert_inherits");
     expose(_assert_inherits("assert_idl_attribute"), "assert_idl_attribute");
 
+    // FIXME: Remove assert_will_be_idl_attribute once we finish the transition
+    // of moving the DOM attributes to prototype chains.
+    function assert_will_be_idl_attribute(object, property_name, description) {
+        assert(typeof object === "object",
+               "assert_will_be_idl_attribute", description,
+               "provided value is not an object");
+
+        assert("hasOwnProperty" in object,
+               "assert_will_be_idl_attribute", description,
+               "provided value is an object but has no hasOwnProperty method");
+
+        // Do not test if property_name is not an own property because
+        // property_name is in the middle of the transition to a prototype
+        // chain.
+
+        assert(property_name in object,
+               "assert_will_be_idl_attribute", description,
+               "property ${p} not found in the provided value",
+               {p:property_name});
+    }
+    expose(assert_will_be_idl_attribute, "assert_will_be_idl_attribute");
+
     function assert_readonly(object, property_name, description)
     {
          var initial_value = object[property_name];
          try {
              //Note that this can have side effects in the case where
              //the property has PutForwards
              object[property_name] = initial_value + "a"; //XXX use some other value here?
              assert(same_value(object[property_name], initial_value),
                     "assert_readonly", description,
                     "changing property ${p} succeeded",
@@ skipping 1399 matching lines @@
         } else if (!tests.allow_uncaught_exception) {
             tests.status.status = tests.status.ERROR;
             tests.status.message = e.message;
         }
     });
 
     test_environment.on_tests_ready();
 
 })();
 // vim: set expandtab shiftwidth=4 tabstop=4: