michael@0: // Set methods throw when passed a this-value that isn't a Set.
michael@0: 
michael@0: load(libdir + "asserts.js");
michael@0: 
michael@0: function testcase(obj, fn) {
michael@0:     assertEq(typeof fn, "function");
michael@0:     var args = Array.slice(arguments, 2);
michael@0:     assertThrowsInstanceOf(function () { fn.apply(obj, args); }, TypeError);
michael@0: }
michael@0: 
michael@0: var Set_size_getter = Object.getOwnPropertyDescriptor(Set.prototype, "size").get;
michael@0: 
michael@0: function test(obj) {
michael@0:     testcase(obj, Set.prototype.has, 12);
michael@0:     testcase(obj, Set.prototype.add, 12);
michael@0:     testcase(obj, Set.prototype.delete, 12);
michael@0:     testcase(obj, Set.prototype.clear);
michael@0:     testcase(obj, Set.prototype.keys);
michael@0:     testcase(obj, Set.prototype.values);
michael@0:     testcase(obj, Set.prototype.entries);
michael@0:     testcase(obj, Set_size_getter);
michael@0: }
michael@0: 
michael@0: test(Set.prototype);
michael@0: test(Object.create(new Set));
michael@0: test(new Map());
michael@0: test({});
michael@0: test(null);
michael@0: test(undefined);