1 files changed, 25 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/plain-object-to-string.js b/js/src/jit-test/tests/basic/plain-object-to-string.js
new file mode 100644
index 0000000000..8af972bb4a
--- /dev/null
+++ b/js/src/jit-test/tests/basic/plain-object-to-string.js
@@ -0,0 +1,25 @@
+// Test for OrdinaryToPrimitive called on a plain object with hint "string".
+
+function assertStr(o, s) {
+  assertEq(String(o), s);
+}
+function test() {
+  assertStr({x: 1}, "[object Object]");
+  assertStr({[Symbol.toStringTag]: "Foo"}, "[object Foo]");
+  assertStr({toString() { return 123; }}, "123");
+  assertStr({toString: Math.abs}, "NaN");
+  assertStr({x: "hello", toString() { return this.x; }}, "hello");
+
+  let c = 0;
+  let fun = () => "hi-" + ++c;
+  assertStr({toString: fun}, "hi-1");
+  assertStr({toString: "foo", valueOf: fun}, "hi-2");
+  assertStr({toString() { return {}; }, valueOf: fun}, "hi-3");
+
+  let proto = {};
+  proto[Symbol.toStringTag] = null;
+  assertStr(Object.create(proto), "[object Object]");
+  proto[Symbol.toStringTag] = "Bar";
+  assertStr(Object.create(proto), "[object Bar]");
+}
+test();