shift-interpreter/test/evaluation/this.test.ts

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

import chai from 'chai';
import spies from 'chai-spies';
import { assertResult, compare } from '../util';

chai.use(spies);

describe('this', () => {
  it('should refer to local context', () => {
    const context = { global: {}, console };
    context.global = context;

    assertResult(
      compare(`
      const c = {
        a : function() {return this.b},
        b : "Hello"
      }
      c.a();
    `),
    );
  });
  it('should support dynamic context', () => {
    const context = { global: {}, console };
    context.global = context;

    assertResult(
      compare(`
    const outer = {
      inner: {
        innerFn() {
          return this.b
        },
        b: "innerValue"
      },
      outerFn() {
        this.extracted = this.inner.innerFn;
        return this.extracted();
      },
      b : "outerValue"
    }
    outer.outerFn();
    `),
    );
  });
});