Add lightswitch to this firmware

unittest/mgos_mock.h

@@ -6,6 +6,8 @@
 
 #include "mgos.h"
 
+#define MGOS_APP "unittest"
+
 // mgos_log
 enum cs_log_level {
   LL_NONE = -1,
@@ -36,4 +38,6 @@ typedef void (*timer_callback)(void *param);
 mgos_timer_id mgos_set_timer(int msecs, int flags, timer_callback cb, void *cb_arg);
 void mgos_clear_timer(mgos_timer_id id);
 
+float mg_time();
+
 #endif // __MGOS_MOCK_H