First step to adding test timing support: create gtk Clock widget (clock.py).

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diff --git a/clock.py b/clock.py
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+#!/usr/bin/python
+
+import gtk
+import gobject
+
+class Time(object):
+  def __init__(self,time=None):
+    if time:
+      if (type(time) == str) or (type(time) == unicode):
+        h,m,s = map(int,time.split(':'))
+        self._seconds = h*3600 + m*60 + s
+      elif type(time) == int:
+        self._seconds = time
+    else:
+      self._seconds = 0
+
+  def _gethms(self):
+    h = self._seconds // 3600
+    m = (self._seconds % 3600) // 60
+    s = self._seconds % 60
+    return h,m,s
+
+  def _sethms(self,hms):
+    h,m,s = hms
+    self._seconds = h*3600 + m*60 + s
+
+  hms = property(_gethms,_sethms)
+
+  def _gethours(self):
+    return self._seconds//3600
+
+  def _sethours(self,value):
+    self._seconds = (self._seconds % 3600) + value*3600
+
+  hours = property(_gethours,_sethours)
+
+  def _getminutes(self):
+    return (self._seconds % 3600) // 60
+
+  def _setminutes(self,value):
+    h,m,s = self.hms
+    self.hms = h, value, s
+
+  minutes = property(_getminutes,_setminutes)
+
+  def _getseconds(self):
+    return self._seconds % 60
+
+  def _setseconds(self,value):
+    self._seconds = (self._seconds //60) * 60 + value
+
+  seconds = property(_getseconds,_setseconds)
+
+  def __add__(self,value):
+    if type(value) != int:
+      raise ValueError, "Only integer value may be added to Time value!"
+    return Time(self._seconds + value)
+
+  def __sub__(self,value):
+    if type(value) != int:
+      raise ValueError, "Only integer value may be substracted from Time value!"
+    return Time(self._seconds - value)
+
+  def __str__(self):
+    return "%02d:%02d:%02d" % (self.hours,self.minutes,self.seconds)
+
+  def __repr__(self):
+    return "<Time object: %02d:%02d:%02d>" % (self.hours,self.minutes,self.seconds)
+
+class Clock(gtk.Label):
+  def __init__(self,time=None):
+    gtk.Label.__init__(self)
+    self.set_time(time)
+    self.on_end = None
+
+  def set_time(self,time=None):
+    if time:
+      if type(time) == str:
+        self.time = Time(time)
+      elif type(time) == Time:
+        self.time = time
+    else:
+      self.time = Time()
+    self.set_label(str(self.time))
+
+  def __on_timer(self):
+    self.time += self.counter
+    self.set_label(str(self.time))
+    if self.time == Time():
+      if self.on_end:
+        self.on_end()
+      return False
+    return True
+
+  def start(self):
+    self.counter = 1
+    gobject.timeout_add(1000,self.__on_timer)
+
+  def count_down(self):
+    self.counter = -1
+    gobject.timeout_add(1000,self.__on_timer)
+
+if __name__ == "__main__":
+  wnd = gtk.Window()
+  wnd.connect("delete_event",gtk.main_quit)
+  clock = Clock("1:00:00")
+  wnd.add(clock)
+  wnd.show_all()
+  clock.count_down()
+
+  gtk.main()
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