diff --git a/tests/interfaces/openlp_core_ui/test_settings_form.py b/tests/interfaces/openlp_core_ui/test_settings_form.py
index 4ab0b11af..09d4a22eb 100644
--- a/tests/interfaces/openlp_core_ui/test_settings_form.py
+++ b/tests/interfaces/openlp_core_ui/test_settings_form.py
@@ -27,6 +27,9 @@ class TestSettingsForm(TestCase):
         """
         Some pre-test setup required.
         """
+        self.dummy1 = MagicMock()
+        self.dummy2 = MagicMock()
+        self.dummy3 = MagicMock()
         self.desktop = MagicMock()
         self.desktop.primaryScreen.return_value = SCREEN[u'primary']
         self.desktop.screenCount.return_value = SCREEN[u'number']
@@ -109,49 +112,58 @@ class TestSettingsForm(TestCase):
         # THEN the processing stack should still have two items
         assert len(self.form.processes) == 2, u'No new processes should have been added to the stack'
 
-    def register_multiple_functions_test(self):
+    def register_image_manager_trigger_test_one(self):
         """
-        Test running the settings form and adding multiple functions
+        Test the triggering of the image manager rebuild event from image background change
         """
         # GIVEN: Three functions registered to be call
-        dummy1 = MagicMock()
-        dummy2 = MagicMock()
-        dummy3 = MagicMock()
+        Registry().register_function(u'images_config_updated', self.dummy1)
+        Registry().register_function(u'config_screen_changed', self.dummy2)
+        Registry().register_function(u'images_regenerate', self.dummy3)
 
-        Registry().register_function(u'images_config_updated', dummy1)
-        Registry().register_function(u'config_screen_changed', dummy2)
-        Registry().register_function(u'images_regenerate', dummy3)
-
-        # WHEN: The Images have been changed and the form sumbitted
+        # WHEN: The Images have been changed and the form submitted
         self.form.register_post_process(u'images_config_updated')
         self.form.accept()
 
-        # THEN Images_regenerate should have been called.
-        assert dummy1.call_count == 1, u'dummy1 should have been called once'
-        assert dummy2.call_count == 0, u'dummy2 should not have been called once'
-        assert dummy3.call_count == 1, u'dummy3 should have been called once'
+        # THEN: images_regenerate should have been added.
+        assert self.dummy1.call_count == 1, u'dummy1 should have been called once'
+        assert self.dummy2.call_count == 0, u'dummy2 should not have been called at all'
+        assert self.dummy3.call_count == 1, u'dummy3 should have been called once'
+
+    def register_image_manager_trigger_test_two(self):
+        """
+        Test the triggering of the image manager rebuild event from screen dimension change
+        """
+        # GIVEN: Three functions registered to be call
+        Registry().register_function(u'images_config_updated', self.dummy1)
+        Registry().register_function(u'config_screen_changed', self.dummy2)
+        Registry().register_function(u'images_regenerate', self.dummy3)
 
         # WHEN: The Images have been changed and the form submitted
-        dummy1.reset_mock()
-        dummy2.reset_mock()
-        dummy3.reset_mock()
         self.form.register_post_process(u'config_screen_changed')
         self.form.accept()
 
-        # THEN Images_regenerate should have been called.
-        assert dummy1.call_count == 0, u'dummy1 should not have been called once'
-        assert dummy2.call_count == 1, u'dummy2 should have been called once'
-        assert dummy3.call_count == 1, u'dummy3 should have been called once'
+        # THEN: images_regenerate should have been added.
+        assert self.dummy1.call_count == 0, u'dummy1 should not have been called at all'
+        assert self.dummy2.call_count == 1, u'dummy2 should have been called once'
+        assert self.dummy3.call_count == 1, u'dummy3 should have been called once'
+
+    def register_image_manager_trigger_test_three(self):
+        """
+        Test the triggering of the image manager rebuild event from image background change and a change to the
+        screen dimension.
+        """
+        # GIVEN: Three functions registered to be call
+        Registry().register_function(u'images_config_updated', self.dummy1)
+        Registry().register_function(u'config_screen_changed', self.dummy2)
+        Registry().register_function(u'images_regenerate', self.dummy3)
 
         # WHEN: The Images have been changed and the form submitted
-        dummy1.reset_mock()
-        dummy2.reset_mock()
-        dummy3.reset_mock()
         self.form.register_post_process(u'config_screen_changed')
         self.form.register_post_process(u'images_config_updated')
         self.form.accept()
 
-        # THEN Images_regenerate should have been called.
-        assert dummy1.call_count == 1, u'dummy1 should have been called once'
-        assert dummy2.call_count == 1, u'dummy2 should have been called once'
-        assert dummy3.call_count == 1, u'dummy3 should have been called once'
\ No newline at end of file
+        # THEN: Images_regenerate should have been added.
+        assert self.dummy1.call_count == 1, u'dummy1 should have been called once'
+        assert self.dummy2.call_count == 1, u'dummy2 should have been called once'
+        assert self.dummy3.call_count == 1, u'dummy3 should have been called once'
\ No newline at end of file