code: function( code, e, message ) {
  		var callback = munit.render.callback;
  
  		// Force a numeric code for the first parameter
  		if ( ! munit.isNumber( code ) ) {
  			throw new Error( "Numeric code parameter required for munit.exit" );
  		}
  
  		// Allow code, message only arguments
  		if ( message === undefined && munit.isString( e ) ) {
  			message = e;
  			e = null;
  		}
  
  		// Messaging
  		if ( munit.isString( message ) ) {
  			munit.color.red( message );
  		}
  
  		// Force an error object for callbacks
  		if ( ! munit.isError( e ) ) {
  			e = new Error( message || 'munit exited' );
  		}
  		e.code = code;
  
  		// Only print out stack trace on an active process
  		if ( munit.render.state !== munit.RENDER_STATE_COMPLETE ) {
  			munit.log( e.stack );
  		}
  
  		// Callback takes priority
  		if ( callback ) {
  			munit.render.callback = undefined;
  			callback( e, munit );
  		}
  		// No callback, end the process
  		else {
  			munit._exit( code );
  		}
  	}
docs: Helper for printing out errors before exiting