code: function(err) {
          if (err) { done(err); return; }
          var assert = require('assert');
          var difflet = require('difflet')({indent: 2, comment: true});
          try {
            assert.deepEqual(options.test.actual, options.expected, 'Actual should match expected.');
            grunt.log.writeln('Test passed.');
            done();
          } catch (err) {
            grunt.log.subhead('Assertion Failure');
            console.log(difflet.compare(err.expected, err.actual));
            done(err);
          }
        }
docs: Complete the task when done.