shift-interpreter/dist/test/evaluation/new-expression.test.js

Shift-interpreter is an experimental JavaScript meta-interpreter useful for reverse engineering and analysis. One notable difference from other projects is that shift-interpreter retains state over an entire script but can be fed expressions and statement

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const mocha_1 = require("mocha");
const util_1 = require("../util");
mocha_1.describe('new', () => {
    it('should instantiate functions and retain prototype chain', () => {
        util_1.assertResult(util_1.compare(`
      function d() {}
      d.prototype.run = function () {return "expected"};
      d.prototype.run();
      const a = new d();
      a.run();
    `));
    });
    it('should return the return value for an instantiated function if the fn returns', () => {
        util_1.assertResult(util_1.compare(`
      function d() { return { run() {return 'this one'}}; }
      d.prototype.run = function () {return "not this one"};
      d.prototype.run();
      const a = new d();
      a.run();
    `));
    });
    it('should still return the "this" if a primitive is returned', () => {
        util_1.assertResult(util_1.compare(`
      function d() { return 2; }
      d.prototype.run = function () {return "expected"};
      d.prototype.run();
      const a = new d();
      a.run();
    `));
    });
});
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