[test] Fixed tests compilation

apps/Makefile

@@ -58,6 +58,7 @@ apps_src += $(addprefix apps/,\
   math_variable_box_empty_controller.cpp \
   shift_alpha_lock_view.cpp \
   suspend_timer.cpp \
+  timer_manager.cpp \
   title_bar_view.cpp \
 )
 
@@ -117,6 +118,7 @@ apps_tests_src = $(app_calculation_test_src) $(app_code_test_src) $(app_graph_te
 apps_tests_src += $(addprefix apps/,\
   alternate_empty_nested_menu_controller.cpp \
   global_preferences.cpp \
+  dummy_timer_manager.cpp \
 )
 
 ifeq ($(THEME_REPO),local)

apps/dummy_timer_manager.cpp

@@ -0,0 +1,6 @@
+#include <escher/timer_manager.h>
+
+// This is the dummy implementation used in tests
+
+void TimerManager::AddTimer(Timer * timer) {  }
+void TimerManager::RemoveTimer(Timer * timer) {  }

apps/timer_manager.cpp

@@ -0,0 +1,10 @@
+#include <escher/timer_manager.h>
+#include <apps/apps_container.h>
+
+void TimerManager::AddTimer(Timer * timer) {
+    AppsContainer::sharedAppsContainer()->addTimer(timer);
+}
+
+void TimerManager::RemoveTimer(Timer * timer) {
+    AppsContainer::sharedAppsContainer()->removeTimer(timer);
+}