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load("test-common.js");
try {
assert(Object.preventExtensions() === undefined);
assert(Object.preventExtensions(undefined) === undefined);
assert(Object.preventExtensions(null) === null);
assert(Object.preventExtensions(true) === true);
assert(Object.preventExtensions(6) === 6);
assert(Object.preventExtensions("test") === "test");
let s = Symbol();
assert(Object.preventExtensions(s) === s);
let o = { foo: "foo" };
assert(o.foo === "foo");
o.bar = "bar";
assert(o.bar === "bar");
assert(Object.preventExtensions(o) === o);
assert(o.foo === "foo");
assert(o.bar === "bar");
o.baz = "baz";
assert(o.baz === undefined);
assertThrowsError(() => {
Object.defineProperty(o, "baz", { value: "baz" });
}, {
error: TypeError,
message: "Unable to define property on non-extensible object",
});
assert(o.baz === undefined);
assertThrowsError(() => {
"use strict";
o.baz = "baz";
}, {
error: TypeError,
message: "Cannot define property baz on non-extensible object",
});
assertThrowsError(() => {
"use strict";
Object.defineProperty(o, "baz", { value: "baz" });
}, {
error: TypeError,
message: "Cannot define property baz on non-extensible object",
});
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}
|
