Example of failing test not invoking 'after'

simple-mocha.js

var should = require('should');

describe('Simple Test', function() {

  after(function(done) {
    console.log('In After');
    done();
  });

  describe('specific test', function() {

    it('should pass', function(done) {
      setTimeout(function() {
        should.not.exist(true);
        done();
      },100);
    });

    it('should also pass', function(done) {
      should.exist(true);
      done();
    });

  });

});