babel/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/exec.js

var Base = {
  test: '1',
};

var obj = {
  bar() {
    return ++super.test;
  }
};
Object.setPrototypeOf(obj, Base);

assert.strictEqual(obj.bar(), 2);
assert.strictEqual(Base.test, '1');
assert.strictEqual(obj.test, 2);