Observer pattern implemented

Author: DeadlyApps

forms/ScreenBlockerMenu.py

@@ -2,6 +2,7 @@
 
 
 class ScreenBlockerMenu(Frame):
+
     def __init__(self, master, **kwargs):
         super().__init__(master, **kwargs)
         self.master = master

tests/TestsTimeOptions.py

@@ -5,15 +5,34 @@ class TimeOptionsManager(object):
     def __init__(self):
         self.minutes = 10
         self.seconds = 0
+        self.time_change_callbacks = []
 
     def get_time_string(self):
-        return "{0:0>2}:00".format(self.minutes, self.seconds)
+        return "{0:0>2}:{1:0>2}".format(self.minutes, self.seconds)
 
-    def indement_minutes(self):
+    def increment_minutes(self):
         self.minutes += 1
+        self.fire_time_change_callbacks()
 
     def decriment_minutes(self):
         self.minutes -= 1
+        self.fire_time_change_callbacks()
+
+    def increment_seconds(self):
+        self.seconds = (self.seconds + 15) % 60
+        self.fire_time_change_callbacks()
+
+    def decrement_seconds(self):
+        self.seconds = ((self.seconds + 60) - 15) % 60
+        self.fire_time_change_callbacks()
+
+    def subscribe_to_timechange(self, time_change_callback):
+        self.time_change_callbacks.append(time_change_callback)
+
+    def fire_time_change_callbacks(self):
+        for time_change_callback in self.time_change_callbacks:
+            if time_change_callback:
+                time_change_callback(self.get_time_string())
 
 
 class TestsTimeOptions(unittest.TestCase):
@@ -24,7 +43,7 @@ def test_default_time_10_minutes(self):
 
     def test_indement_minutes_once_is_11_minutes(self):
         time_options_manager = TimeOptionsManager()
-        time_options_manager.indement_minutes()
+        time_options_manager.increment_minutes()
         result = time_options_manager.get_time_string()
         self.assertEqual(result, "11:00")
 
@@ -34,6 +53,48 @@ def test_decriment_minutes_once_is_9_minutes(self):
         result = time_options_manager.get_time_string()
         self.assertEqual(result, "09:00")
 
+    def test_increment_seconds_once_is_10_minutes_15_seconds(self):
+        time_options_manager = TimeOptionsManager()
+        time_options_manager.increment_seconds()
+        result = time_options_manager.get_time_string()
+        self.assertEqual(result, "10:15")
+
+    def test_increment_seconds_4_times_is_10_minutes(self):
+        time_options_manager = TimeOptionsManager()
+        time_options_manager.increment_seconds()
+        time_options_manager.increment_seconds()
+        time_options_manager.increment_seconds()
+        time_options_manager.increment_seconds()
+        result = time_options_manager.get_time_string()
+        self.assertEqual(result, "10:00")
+
+    def test_decrement_seconds_once_is_10_minutes_45_seconds(self):
+        time_options_manager = TimeOptionsManager()
+        time_options_manager.decrement_seconds()
+        result = time_options_manager.get_time_string()
+        self.assertEqual(result, "10:45")
+
+    def test_decrement_seconds_3_times_is_10_minutes_45_seconds(self):
+        time_options_manager = TimeOptionsManager()
+        time_options_manager.decrement_seconds()
+        time_options_manager.decrement_seconds()
+        time_options_manager.decrement_seconds()
+        result = time_options_manager.get_time_string()
+        self.assertEqual(result, "10:15")
+
+    def test_subscribe_to_time_changes(self):
+        time_options_manager = TimeOptionsManager()
+        result = { "result" : "time"}
+
+        def time_change_callback(time):
+            result["result"] += " " + time
+
+        time_options_manager.subscribe_to_timechange(time_change_callback)
+
+        time_options_manager.increment_seconds()
+
+        self.assertEqual(result["result"], "time 10:15")
+
 
 if __name__ == '__main__':
     unittest.main()