1 files changed, 62 insertions, 0 deletions
diff --git a/js/src/tests/non262/Date/toPrimitive.js b/js/src/tests/non262/Date/toPrimitive.js
new file mode 100644
index 0000000000..11346b1ae8
--- /dev/null
+++ b/js/src/tests/non262/Date/toPrimitive.js
@@ -0,0 +1,62 @@
+// ES6 20.3.4.45 Date.prototype[@@toPrimitive](hint)
+
+// The toPrimitive method throws if the this value isn't an object.
+var toPrimitive = Date.prototype[Symbol.toPrimitive];
+assertThrowsInstanceOf(() => toPrimitive.call(undefined, "default"), TypeError);
+assertThrowsInstanceOf(() => toPrimitive.call(3, "default"), TypeError);
+
+// It doesn't have to be a Date object, though.
+var obj = {
+    toString() { return "str"; },
+    valueOf() { return "val"; }
+};
+assertEq(toPrimitive.call(obj, "number"), "val");
+assertEq(toPrimitive.call(obj, "string"), "str");
+assertEq(toPrimitive.call(obj, "default"), "str");
+
+// It throws if the hint argument is missing or not one of the three allowed values.
+assertThrowsInstanceOf(() => toPrimitive.call(obj), TypeError);
+assertThrowsInstanceOf(() => toPrimitive.call(obj, undefined), TypeError);
+assertThrowsInstanceOf(() => toPrimitive.call(obj, "boolean"), TypeError);
+assertThrowsInstanceOf(() => toPrimitive.call(obj, ["number"]), TypeError);
+assertThrowsInstanceOf(() => toPrimitive.call(obj, {toString() { throw "FAIL"; }}), TypeError);
+
+// The next few tests cover the OrdinaryToPrimitive algorithm, specified in
+// ES6 7.1.1 ToPrimitive(input [, PreferredType]).
+
+// Date.prototype.toString or .valueOf can be overridden.
+var dateobj = new Date();
+Date.prototype.toString = function () {
+    assertEq(this, dateobj);
+    return 14;
+};
+Date.prototype.valueOf = function () {
+    return "92";
+};
+assertEq(dateobj[Symbol.toPrimitive]("number"), "92");
+assertEq(dateobj[Symbol.toPrimitive]("string"), 14);
+assertEq(dateobj[Symbol.toPrimitive]("default"), 14);
+assertEq(dateobj == 14, true);  // equality comparison: passes "default"
+
+// If this.toString is a non-callable value, this.valueOf is called instead.
+Date.prototype.toString = {};
+assertEq(dateobj[Symbol.toPrimitive]("string"), "92");
+assertEq(dateobj[Symbol.toPrimitive]("default"), "92");
+
+// And vice versa.
+Date.prototype.toString = function () { return 15; };
+Date.prototype.valueOf = "ponies";
+assertEq(dateobj[Symbol.toPrimitive]("number"), 15);
+
+// If neither is callable, it throws a TypeError.
+Date.prototype.toString = "ponies";
+assertThrowsInstanceOf(() => dateobj[Symbol.toPrimitive]("default"), TypeError);
+
+// Surface features.
+assertEq(toPrimitive.name, "[Symbol.toPrimitive]");
+var desc = Object.getOwnPropertyDescriptor(Date.prototype, Symbol.toPrimitive);
+assertEq(desc.configurable, true);
+assertEq(desc.enumerable, false);
+assertEq(desc.writable, false);
+
+reportCompare(0, 0);