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diff --git a/js/src/tests/ecma_5/Date/toJSON-01.js b/js/src/tests/ecma_5/Date/toJSON-01.js
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+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+var gTestfile = 'toJSON-01.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 584811;
+var summary = "Date.prototype.toJSON isn't to spec";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var called;
+
+var dateToJSON = Date.prototype.toJSON;
+assertEq(Date.prototype.hasOwnProperty("toJSON"), true);
+assertEq(typeof dateToJSON, "function");
+
+// brief test to exercise this outside of isolation, just for sanity
+var invalidDate = new Date();
+invalidDate.setTime(NaN);
+assertEq(JSON.stringify({ p: invalidDate }), '{"p":null}');
+
+
+/* 15.9.5.44 Date.prototype.toJSON ( key ) */
+assertEq(dateToJSON.length, 1);
+
+/*
+ * 1. Let O be the result of calling ToObject, giving it the this value as its
+ * argument.
+ */
+try
+{
+ dateToJSON.call(null);
+ throw new Error("should have thrown a TypeError");
+}
+catch (e)
+{
+ assertEq(e instanceof TypeError, true,
+ "ToObject throws TypeError for null/undefined");
+}
+
+try
+{
+ dateToJSON.call(undefined);
+ throw new Error("should have thrown a TypeError");
+}
+catch (e)
+{
+ assertEq(e instanceof TypeError, true,
+ "ToObject throws TypeError for null/undefined");
+}
+
+
+/*
+ * 2. Let tv be ToPrimitive(O, hint Number).
+ * ...expands to:
+ * 1. Let valueOf be the result of calling the [[Get]] internal method of object O with argument "valueOf".
+ * 2. If IsCallable(valueOf) is true then,
+ * a. Let val be the result of calling the [[Call]] internal method of valueOf, with O as the this value and
+ * an empty argument list.
+ * b. If val is a primitive value, return val.
+ * 3. Let toString be the result of calling the [[Get]] internal method of object O with argument "toString".
+ * 4. If IsCallable(toString) is true then,
+ * a. Let str be the result of calling the [[Call]] internal method of toString, with O as the this value and
+ * an empty argument list.
+ * b. If str is a primitive value, return str.
+ * 5. Throw a TypeError exception.
+ */
+try
+{
+ var r = dateToJSON.call({ get valueOf() { throw 17; } });
+ throw new Error("didn't throw, returned: " + r);
+}
+catch (e)
+{
+ assertEq(e, 17, "bad exception: " + e);
+}
+
+called = false;
+assertEq(dateToJSON.call({ valueOf: null,
+ toString: function() { called = true; return 12; },
+ toISOString: function() { return "ohai"; } }),
+ "ohai");
+assertEq(called, true);
+
+called = false;
+assertEq(dateToJSON.call({ valueOf: function() { called = true; return 42; },
+ toISOString: function() { return null; } }),
+ null);
+assertEq(called, true);
+
+try
+{
+ called = false;
+ dateToJSON.call({ valueOf: function() { called = true; return {}; },
+ get toString() { throw 42; } });
+}
+catch (e)
+{
+ assertEq(called, true);
+ assertEq(e, 42, "bad exception: " + e);
+}
+
+called = false;
+assertEq(dateToJSON.call({ valueOf: function() { called = true; return {}; },
+ get toString() { return function() { return 8675309; }; },
+ toISOString: function() { return true; } }),
+ true);
+assertEq(called, true);
+
+var asserted = false;
+called = false;
+assertEq(dateToJSON.call({ valueOf: function() { called = true; return {}; },
+ get toString()
+ {
+ assertEq(called, true);
+ asserted = true;
+ return function() { return 8675309; };
+ },
+ toISOString: function() { return NaN; } }),
+ NaN);
+assertEq(asserted, true);
+
+try
+{
+ var r = dateToJSON.call({ valueOf: null, toString: null,
+ get toISOString()
+ {
+ throw new Error("shouldn't have been gotten");
+ } });
+ throw new Error("didn't throw, returned: " + r);
+}
+catch (e)
+{
+ assertEq(e instanceof TypeError, true, "bad exception: " + e);
+}
+
+
+/* 3. If tv is a Number and is not finite, return null. */
+assertEq(dateToJSON.call({ valueOf: function() { return Infinity; } }), null);
+assertEq(dateToJSON.call({ valueOf: function() { return -Infinity; } }), null);
+assertEq(dateToJSON.call({ valueOf: function() { return NaN; } }), null);
+
+assertEq(dateToJSON.call({ valueOf: function() { return Infinity; },
+ toISOString: function() { return {}; } }), null);
+assertEq(dateToJSON.call({ valueOf: function() { return -Infinity; },
+ toISOString: function() { return []; } }), null);
+assertEq(dateToJSON.call({ valueOf: function() { return NaN; },
+ toISOString: function() { return undefined; } }), null);
+
+
+/*
+ * 4. Let toISO be the result of calling the [[Get]] internal method of O with
+ * argument "toISOString".
+ */
+try
+{
+ var r = dateToJSON.call({ get toISOString() { throw 42; } });
+ throw new Error("didn't throw, returned: " + r);
+}
+catch (e)
+{
+ assertEq(e, 42, "bad exception: " + e);
+}
+
+
+/* 5. If IsCallable(toISO) is false, throw a TypeError exception. */
+try
+{
+ var r = dateToJSON.call({ toISOString: null });
+ throw new Error("didn't throw, returned: " + r);
+}
+catch (e)
+{
+ assertEq(e instanceof TypeError, true, "bad exception: " + e);
+}
+
+try
+{
+ var r = dateToJSON.call({ toISOString: undefined });
+ throw new Error("didn't throw, returned: " + r);
+}
+catch (e)
+{
+ assertEq(e instanceof TypeError, true, "bad exception: " + e);
+}
+
+try
+{
+ var r = dateToJSON.call({ toISOString: "oogabooga" });
+ throw new Error("didn't throw, returned: " + r);
+}
+catch (e)
+{
+ assertEq(e instanceof TypeError, true, "bad exception: " + e);
+}
+
+try
+{
+ var r = dateToJSON.call({ toISOString: Math.PI });
+ throw new Error("didn't throw, returned: " + r);
+}
+catch (e)
+{
+ assertEq(e instanceof TypeError, true, "bad exception: " + e);
+}
+
+
+/*
+ * 6. Return the result of calling the [[Call]] internal method of toISO with O
+ * as the this value and an empty argument list.
+ */
+var o =
+ {
+ toISOString: function(a)
+ {
+ called = true;
+ assertEq(this, o);
+ assertEq(a, undefined);
+ assertEq(arguments.length, 0);
+ return obj;
+ }
+ };
+var obj = {};
+called = false;
+assertEq(dateToJSON.call(o), obj, "should have gotten obj back");
+assertEq(called, true);
+
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+ reportCompare(true, true);
+
+print("All tests passed!");