code: function(metric) {
  			var expected = this.getAssertion(metric),
  				val = this.getMetric(metric);
  
  			if (!this.hasAssertion(metric) || typeof val === 'undefined') {
  				return true;
  			}
  
  			return (typeof val === 'number') ? val <= expected : true;
  		}
docs: assertions