JS: add process EventEmitter test

Author: esbena

javascript/ql/test/library-tests/frameworks/EventEmitter/tst.js

@@ -37,4 +37,11 @@ class ExtendsMyCustomEmitter extends MyEventEmitter{}
 
 var em5 = new ExtendsMyCustomEmitter();
 em5.on("yibity", (x) => {});
-em5.emit("yibity", "yabity");
+em5.emit("yibity", "yabity");
+
+var process = require('process');
+process.addListener('FirstEvent', function (first) {});
+process.on('SecondEvent', function (second) {});
+
+process.emit('FirstEvent', 'FirstData');
+process.emit('SecondEvent', 'SecondData');