bugfix restore_timers() if timers.txt not exists and add tests

Author: jedie

helpers/test_times_utils.py

@@ -6,10 +6,14 @@
 
     Note: Will overwrite existing saved timers!
 """
-from times_utils import parse_timers, restore_timers, save_timers
+
+
+import uos as os
+from times_utils import get_active_days, parse_timers, restore_timers, save_active_days, save_timers
 
 
 def run_device_test():
+
     print('test parse_timers()...', end=' ')
     results = tuple(parse_timers('''
         0:00 - 1:00
@@ -25,7 +29,16 @@ def run_device_test():
         ((22, 1), (22, 30)),
         ((23, 12), (23, 59))
     ), results
-    print('OK')
+    print('OK\n')
+
+    print('test not existing "timers.txt"...', end=' ')
+    try:
+        os.remove('timers.txt')
+    except BaseException:
+        pass
+    results = tuple(restore_timers())
+    assert results == (), results
+    print('OK\n')
 
     print('test save_timers()...', end=' ')
     save_timers([
@@ -37,16 +50,32 @@ def run_device_test():
         ((6, 0), (7, 0)),
         ((19, 0), (22, 0))
     ), results
-    print('OK')
+    print('OK\n')
+
+    print('test not existing "timer_days.txt"...', end=' ')
+    try:
+        os.remove('timer_days.txt')
+    except BaseException:
+        pass
+    results = tuple(get_active_days())
+    assert results == (0, 1, 2, 3, 4, 5, 6), results
+    print('OK\n')
+
+    print('test save_active_days()...', end=' ')
+    save_active_days(active_days=(0, 1, 2, 3, 4))
+    results = tuple(get_active_days())
+    assert results == (0, 1, 2, 3, 4), results
+    print('OK\n')
 
 
 if __name__ == '__main__':
     print('Run tests on device...')
+
     import sys
     sys.modules.clear()
 
     import gc
     gc.collect()
 
     run_device_test()
-    print('OK')
+    print('OK\n')

src/times_utils.py

@@ -74,7 +74,6 @@ def restore_timers():
             yield from parse_timers(f.read())
     except OSError:
         print('File not exists: %r' % _TIMERS_FILENAME)
-        yield ()
 
 
 def get_active_days():