1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/tests/non262/Symbol/toPrimitive.js b/js/src/tests/non262/Symbol/toPrimitive.js
new file mode 100644
index 0000000000..06262f99c6
--- /dev/null
+++ b/js/src/tests/non262/Symbol/toPrimitive.js
@@ -0,0 +1,39 @@
+// ES6 19.4.3.4 Symbol.prototype[@@toPrimitive](hint)
+
+// This method gets the primitive symbol from a Symbol wrapper object.
+var sym = Symbol.for("truth")
+var obj = Object(sym);
+assertEq(obj[Symbol.toPrimitive]("default"), sym);
+
+// The hint argument is ignored.
+assertEq(obj[Symbol.toPrimitive]("number"), sym);
+assertEq(obj[Symbol.toPrimitive]("string"), sym);
+assertEq(obj[Symbol.toPrimitive](), sym);
+assertEq(obj[Symbol.toPrimitive](Math.atan2), sym);
+
+// The this value can also be a primitive symbol.
+assertEq(sym[Symbol.toPrimitive](), sym);
+
+// Or a wrapper to a Symbol object in another compartment.
+var obj2 = newGlobal().Object(sym);
+assertEq(obj2[Symbol.toPrimitive]("default"), sym);
+
+// Otherwise a TypeError is thrown.
+var symbolToPrimitive = Symbol.prototype[Symbol.toPrimitive];
+var nonSymbols = [
+    undefined, null, true, 13, NaN, "justice", {}, [sym],
+    symbolToPrimitive,
+    new Proxy(obj, {})
+];
+for (var value of nonSymbols) {
+    assertThrowsInstanceOf(() => symbolToPrimitive.call(value, "string"), TypeError);
+}
+
+// Surface features:
+assertEq(symbolToPrimitive.name, "[Symbol.toPrimitive]");
+var desc = Object.getOwnPropertyDescriptor(Symbol.prototype, Symbol.toPrimitive);
+assertEq(desc.configurable, true);
+assertEq(desc.enumerable, false);
+assertEq(desc.writable, false);
+
+reportCompare(0, 0);