[proxy] fixing harmony/proxy.js tests and improving error messages + some drive-by fixes

test/mjsunit/harmony/proxies-for.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --harmony-proxies
 
 
 // Helper.
 
 function TestWithProxies(test, x, y, z) {
   test(function(h){ return new Proxy({}, h) }, x, y, z)
-  // TODO(cbruni): enable once we have [[Call]] working.
-  // test(function(h) {
-    // return Proxy.createFunction(h, function() {})
-  // }, x, y, z)
+  test(function(h) {
+    return new Proxy(function() {}, h)
+  }, x, y, z)
 }
 
 
 // Iterate over a proxy.
 
 Array.prototype.values = function() { return this[Symbol.iterator]() }
 
 function TestForIn(properties, handler) {
   TestWithProxies(TestForIn2, properties, handler)
 }
 
 function TestForIn2(create, properties, handler) {
   var p = create(handler)
   var found = []
   for (var x in p) found.push(x)
   assertArrayEquals(properties, found)
 }
 
 TestForIn(["0", "a"], {
-  enumerate: function() { return ["0", "a"].values() }
+  enumerate() { return ["0", "a"].values() },
+  has(target, property) { return true }
 })
 
 TestForIn(["null", "a"], {
-  enumerate: function() { return this.enumerate2() },
-  enumerate2: function() { return ["null", "a"].values() }
+  enumerate() { return this.enumerate2() },
+  enumerate2() { return ["null", "a"].values() },
+  has(target, property) { return true }
 })
 
 TestForIn(["b", "a", "0", "c"], new Proxy({}, {
   get: function(pr, pk) {
     return function() { return ["b", "a", "0", "c"].values() }
   }
 }))
 
 
 
@@ skipping 65 matching lines @@
   o.__proto__ = p;
   var keys = [];
   for (var k in o) { keys.push(k); };
   assertEquals(["0"], keys);
 })();
 
 (function () {
   var p = new Proxy({}, {ownKeys: function() { return ["1", Symbol(), "2"] }});
   assertEquals(["1","2"], Object.getOwnPropertyNames(p));
 })();