shift-interpreter/test/evaluation/update-expressions.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 { compare, assertResult } from '../util';

describe('UpdateExpression', () => {
  it('should evaluate operators the same as the host environment', () => {
    assertResult(compare(`let a = 0; let b = a++; b`));
    assertResult(compare(`let a = 0; let b = ++a; b`));
    assertResult(compare(`let a = 0; let b = a--; b`));
    assertResult(compare(`let a = 0; let b = --a; b`));
  });
});