patched-global.any.js (1935B)
1 // META: global=window,worker,shadowrealm 2 'use strict'; 3 4 // Tests which patch the global environment are kept separate to avoid 5 // interfering with other tests. 6 7 test(t => { 8 // eslint-disable-next-line no-extend-native, accessor-pairs 9 Object.defineProperty(Object.prototype, 'highWaterMark', { 10 set() { throw new Error('highWaterMark setter called'); }, 11 configurable: true 12 }); 13 14 // eslint-disable-next-line no-extend-native, accessor-pairs 15 Object.defineProperty(Object.prototype, 'size', { 16 set() { throw new Error('size setter called'); }, 17 configurable: true 18 }); 19 20 t.add_cleanup(() => { 21 delete Object.prototype.highWaterMark; 22 delete Object.prototype.size; 23 }); 24 25 assert_not_equals(new TransformStream(), null, 'constructor should work'); 26 }, 'TransformStream constructor should not call setters for highWaterMark or size'); 27 28 test(t => { 29 const oldReadableStream = ReadableStream; 30 const oldWritableStream = WritableStream; 31 const getReader = ReadableStream.prototype.getReader; 32 const getWriter = WritableStream.prototype.getWriter; 33 34 // Replace ReadableStream and WritableStream with broken versions. 35 ReadableStream = function () { 36 throw new Error('Called the global ReadableStream constructor'); 37 }; 38 WritableStream = function () { 39 throw new Error('Called the global WritableStream constructor'); 40 }; 41 t.add_cleanup(() => { 42 ReadableStream = oldReadableStream; 43 WritableStream = oldWritableStream; 44 }); 45 46 const ts = new TransformStream(); 47 48 // Just to be sure, ensure the readable and writable pass brand checks. 49 assert_not_equals(getReader.call(ts.readable), undefined, 50 'getReader should work when called on ts.readable'); 51 assert_not_equals(getWriter.call(ts.writable), undefined, 52 'getWriter should work when called on ts.writable'); 53 }, 'TransformStream should use the original value of ReadableStream and WritableStream');