1Tests for ES6 class syntax default constructor 2 3On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". 4 5 6PASS new A instanceof A is true 7PASS A() threw exception TypeError: Class constructor A cannot be invoked without 'new'. 8PASS A.prototype.constructor instanceof Function is true 9PASS A.prototype.constructor.name is "A" 10PASS new B instanceof A; new B instanceof A is true 11PASS B() threw exception TypeError: Class constructor B cannot be invoked without 'new'. 12PASS B.prototype.constructor.name is "B" 13PASS A !== B is true 14PASS A.prototype.constructor !== B.prototype.constructor is true 15PASS new (class extends (class { constructor(a, b) { return [a, b]; } }) {})(1, 2) is [1, 2] 16PASS successfullyParsed is true 17 18TEST COMPLETE 19