So siehts ganz gut aus !

node_modules/event-emitter/test/emit-error.js

@@ -0,0 +1,14 @@
+'use strict';
+
+var customError = require('es5-ext/error/custom')
+  , ee          = require('../');
+
+module.exports = function (t, a) {
+	var x, error = customError('Some error', 'ERROR_TEST'), emitted;
+
+	x = ee();
+	a.throws(function () { t.call(x, error); }, 'ERROR_TEST');
+	x.on('error', function (err) { emitted = err; });
+	t.call(x, error);
+	a(emitted, error);
+};