Conditionally failing tests in afterEach() hooks

As of mocha 1.3.0 you may conditionally fail tests in "after each" hooks by invoking this.test.error(err) with an instanceof Error.

describe('something', function(){
  it('should one', function(){
    this.ok = true;
  })

  it('should two', function(){
    this.ok = false;
  })

  afterEach(function(){
    if (!this.ok) this.test.error(new Error('something went wrong'));
  })
})