bug testcase for reading back an accessor property desc, when only set or get was present when defining the property

ecmascript-testcases/test-bug-prop-set-get-default-value.js

@@ -0,0 +1,54 @@
+/*
+ *  If a 'set' or a 'get' is not given when setting an accessor, the missing
+ *  property should default to undefined.  When reading back the descriptor,
+ *  there should always be a 'set' and a 'get' key for an accessor, with the
+ *  value undefined if the function has not been set.
+ *
+ *  - E5.1 Section 8.6.1, Table 6: [[Get]] and [[Set]] values are either
+ *    (function) Object or undefined
+ *
+ *  - E5.1 Section 8.12.9, step 4.b.i: [...] If the value of an attribute field
+ *    of Desc is absent, the attribute of the newly created property is set to
+ *    its default value.
+ */
+
+/*===
+set true function
+get true undefined
+enumerable true boolean false
+configurable true boolean false
+set true undefined
+get true function
+enumerable true boolean false
+configurable true boolean false
+===*/
+
+function test() {
+    var obj = {};
+    var pd;
+
+    Object.defineProperty(obj, 'prop1', {
+        set: function() { print('prop1 set'); }
+    });
+
+    Object.defineProperty(obj, 'prop2', {
+        get: function() { print('prop2 get'); }
+    });
+
+    function printDesc(prop) {
+        pd = Object.getOwnPropertyDescriptor(obj, prop);
+        print('set', 'set' in pd, typeof pd.set);
+        print('get', 'get' in pd, typeof pd.get);
+        print('enumerable', 'enumerable' in pd, typeof pd.enumerable, pd.enumerable);
+        print('configurable', 'configurable' in pd, typeof pd.configurable, pd.configurable);
+    }
+
+    printDesc('prop1');
+    printDesc('prop2');
+}
+
+try {
+    test();
+} catch (e) {
+    print(e);
+}