load("test-common.js"); try { assert(JSON.stringify.length === 3); assertThrowsError(() => { JSON.stringify(5n); }, { error: TypeError, message: "Cannot serialize BigInt value to JSON", }); const properties = [ [5, "5"], [undefined, undefined], [null, "null"], [NaN, "null"], [-NaN, "null"], [Infinity, "null"], [-Infinity, "null"], [true, "true"], [false, "false"], ["test", '"test"'], [new Number(5), "5"], [new Boolean(false), "false"], [new String("test"), '"test"'], [() => {}, undefined], [[1, 2, "foo"], '[1,2,"foo"]'], [{ foo: 1, bar: "baz", qux() {} }, '{"foo":1,"bar":"baz"}'], [ { var1: 1, var2: 2, toJSON(key) { let o = this; o.var2 = 10; return o; } }, '{"var1":1,"var2":10}', ], ]; properties.forEach(testCase => { assert(JSON.stringify(testCase[0]) === testCase[1]); }); let bad1 = {}; bad1.foo = bad1; let bad2 = []; bad2[5] = [[[bad2]]]; let bad3a = { foo: "bar" }; let bad3b = [1, 2, bad3a]; bad3a.bad = bad3b; [bad1, bad2, bad3a].forEach(bad => assertThrowsError(() => { JSON.stringify(bad); }, { error: TypeError, message: "Cannot stringify circular object", })); let o = { foo: "bar" }; Object.defineProperty(o, "baz", { value: "qux", enumerable: false }); assert(JSON.stringify(o) === '{"foo":"bar"}'); console.log("PASS"); } catch (e) { console.log("FAIL: " + e); }