Added some gtk testing

Gui test/gtk_test.py

@@ -0,0 +1,48 @@
+import gi
+gi.require_version('Gtk', '3.0')
+from gi.repository import Gtk
+import time
+
+class MyWindow(Gtk.Window):
+
+    def __init__(self):
+        Gtk.Window.__init__(self, title = 'Hello World')
+
+        self.val = 0
+
+        self.box = Gtk.Box(spacing=6)
+        self.add(self.box)
+
+        self.button1 = Gtk.Button(label = 'Hello')
+        self.button1.connect('clicked', self.on_button1_clicked)
+        self.box.pack_start(self.button1, True, True, 0)
+
+        self.button2 = Gtk.Button(label = 'Goodbye')
+        self.button2.connect('clicked', self.on_button2_clicked)
+        self.box.pack_start(self.button2, True, True, 0)
+
+        self.pbar = Gtk.ProgressBar()
+        self.pbar.set_fraction(0.0)
+        self.box.pack_start(self.pbar, True, True, 0)
+
+    def on_button1_clicked(self, widget):
+        print('Hello')
+        while self.val < 1:
+            self.update_pbar(self.pbar)
+        print('Goodbye')
+        Gtk.main_quit()
+
+    def on_button2_clicked(self, widget):
+        print('Goodbye')
+
+    def update_pbar(self, widget):
+        self.val += 0.1
+        self.pbar.set_fraction(self.val)
+        time.sleep(0.5)
+        while Gtk.events_pending():
+            Gtk.main_iteration()
+        
+win = MyWindow()
+win.connect('delete-event', Gtk.main_quit)
+win.show_all()
+Gtk.main()