michael@0: // Map methods throw when passed a this-value that isn't a Map.
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 Map_size_getter = Object.getOwnPropertyDescriptor(Map.prototype, "size").get;
michael@0: 
michael@0: function test(obj) {
michael@0:     testcase(obj, Map.prototype.get, "x");
michael@0:     testcase(obj, Map.prototype.has, "x");
michael@0:     testcase(obj, Map.prototype.set, "x", 1);
michael@0:     testcase(obj, Map.prototype.delete, "x");
michael@0:     testcase(obj, Map.prototype.clear);
michael@0:     testcase(obj, Map.prototype.keys);
michael@0:     testcase(obj, Map.prototype.values);
michael@0:     testcase(obj, Map.prototype.entries);
michael@0:     testcase(obj, Map_size_getter);
michael@0: }
michael@0: 
michael@0: test(Map.prototype);
michael@0: test(Object.create(new Map));
michael@0: test(new Set());
michael@0: test({});
michael@0: test(null);
michael@0: test(undefined);