1 files changed, 89 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Symbol/conversions.js b/js/src/tests/ecma_6/Symbol/conversions.js
new file mode 100644
index 000000000..e6265f09c
--- /dev/null
+++ b/js/src/tests/ecma_6/Symbol/conversions.js
@@ -0,0 +1,89 @@
+// Section numbers cite ES6 rev 24 (2014 April 27).
+
+var symbols = [
+    Symbol(),
+    Symbol("one"),
+    Symbol.for("two"),
+    Symbol.iterator
+];
+
+function testSymbolConversions(sym) {
+    // 7.1.2 ToBoolean
+    assertEq(Boolean(sym), true);
+    assertEq(!sym, false);
+    assertEq(sym || 13, sym);
+    assertEq(sym && 13, 13);
+
+    // 7.1.3 ToNumber
+    assertThrowsInstanceOf(() => +sym, TypeError);
+    assertThrowsInstanceOf(() => sym | 0, TypeError);
+
+    // 7.1.12 ToString
+    assertThrowsInstanceOf(() => "" + sym, TypeError);
+    assertThrowsInstanceOf(() => sym + "", TypeError);
+    assertThrowsInstanceOf(() => "" + [1, 2, sym], TypeError);
+    assertThrowsInstanceOf(() => ["simple", "thimble", sym].join(), TypeError);
+
+    // 21.1.1.1 String()
+    assertEq(String(sym), sym.toString());
+
+    // 21.1.1.2 new String()
+    assertThrowsInstanceOf(() => new String(sym), TypeError);
+
+    // 7.1.13 ToObject
+    var obj = Object(sym);
+    assertEq(typeof obj, "object");
+    assertEq(Object.prototype.toString.call(obj), "[object Symbol]");
+    assertEq(Object.getPrototypeOf(obj), Symbol.prototype);
+    assertEq(Object.getOwnPropertyNames(obj).length, 0);
+    assertEq(Object(sym) === Object(sym), false);  // new object each time
+    var f = function () { return this; };
+    assertEq(f.call(sym) === f.call(sym), false);  // new object each time
+}
+
+
+for (var sym of symbols) {
+    testSymbolConversions(sym);
+
+    // 7.1.1 ToPrimitive
+    var symobj = Object(sym);
+    assertThrowsInstanceOf(() => Number(symobj), TypeError);
+    assertThrowsInstanceOf(() => String(symobj), TypeError);
+    assertThrowsInstanceOf(() => symobj < 0, TypeError);
+    assertThrowsInstanceOf(() => 0 < symobj, TypeError);
+    assertThrowsInstanceOf(() => symobj + 1, TypeError);
+    assertThrowsInstanceOf(() => "" + symobj, TypeError);
+    assertEq(sym == symobj, true);
+    assertEq(sym === symobj, false);
+    assertEq(symobj == 0, false);
+    assertEq(0 != symobj, true);
+
+    // 7.1.12 ToString
+    assertThrowsInstanceOf(() => String(Object(sym)), TypeError);
+}
+
+// Deleting Symbol.prototype[@@toPrimitive] does not change the behavior of
+// conversions from a symbol to other types.
+delete Symbol.prototype[Symbol.toPrimitive];
+assertEq(Symbol.toPrimitive in Symbol.prototype, false);
+testSymbolConversions(symbols[0]);
+
+// It does change the behavior of ToPrimitive on Symbol objects, though.
+// It causes the default algorithm (OrdinaryToPrimitive) to be used.
+var VALUEOF_CALLED = 117.25;
+Symbol.prototype.valueOf =  function () { return VALUEOF_CALLED; };
+Symbol.prototype.toString = function () { return "toString called"; };
+for (var sym of symbols) {
+    var symobj = Object(sym);
+    assertEq(Number(symobj), VALUEOF_CALLED);
+    assertEq(String(symobj), "toString called");
+    assertEq(symobj < 0, VALUEOF_CALLED < 0);
+    assertEq(0 < symobj, 0 < VALUEOF_CALLED);
+    assertEq(symobj + 1, VALUEOF_CALLED + 1);
+    assertEq("" + symobj, "" + VALUEOF_CALLED);
+    assertEq(symobj == 0, false);
+    assertEq(0 != symobj, true);
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);