michael@0: // Test that you can't call the SavedFrame constructor and can only use
michael@0: // SavedFrame's getters on SavedFrame instances.
michael@0: 
michael@0: load(libdir + "asserts.js");
michael@0: 
michael@0: let proto = Object.getPrototypeOf(saveStack());
michael@0: 
michael@0: // Can't create new SavedFrame instances by hand.
michael@0: assertThrowsInstanceOf(() => {
michael@0:   new proto.constructor();
michael@0: }, TypeError);
michael@0: 
michael@0: for (let p of ["source", "line", "column", "functionDisplayName", "parent"]) {
michael@0:   // The getters shouldn't work on the prototype.
michael@0:   assertThrowsInstanceOf(() => proto[p], TypeError);
michael@0: 
michael@0:   // Nor should they work on random objects.
michael@0:   let o = {};
michael@0:   Object.defineProperty(o, p, Object.getOwnPropertyDescriptor(proto, p));
michael@0:   assertThrowsInstanceOf(() => o[p], TypeError);
michael@0: }