fix(tests): simplify tests

tests/application.js

@@ -0,0 +1,27 @@
+import electron from "electron";
+import { Application } from "spectron";
+
+const startApplication = function() {
+  this.timeout(30000);
+  this.app = new Application({
+    path: electron,
+    args: ["."],
+    startTimeout: 30000,
+    waitTimeout: 30000,
+    quitTimeout: 10000
+  });
+  return this.app.start();
+};
+
+const stopApplication = function() {
+  this.timeout(30000);
+  if (this.app && this.app.isRunning()) {
+    return this.app.stop();
+  }
+  return undefined;
+};
+
+export {
+  startApplication,
+  stopApplication
+};