test: fix event-emitter-method-names

test/simple/test-event-emitter-method-names.js

@@ -28,5 +28,6 @@ assert.equal(E.constructor.name, 'EventEmitter');
 assert.equal(E.on, E.addListener);  // Same method.
 Object.getOwnPropertyNames(E).forEach(function(name) {
   if (name === 'constructor' || name === 'on') return;
+  if (typeof E[name] !== 'function') return;
   assert.equal(E[name].name, name);
 });