Fix StockAlertTest

Author: AlvaroBrey

Calendula/src/androidTest/java/es/usc/citius/servando/calendula/activities/StockAlertTest.java

@@ -75,6 +75,7 @@ public void setUp() throws SQLException {
         DB.dropAndCreateDatabase();
         // set some vars
         PreferenceUtils.edit().putString(PreferenceKeys.DRUGDB_CURRENT_DB.key(), DATABASE).apply();
+        PreferenceUtils.edit().putString(PreferenceKeys.SETTINGS_STOCK_ALERT_DAYS.key(), "7").apply();
         // create some allergens
         final Patient p = DB.patients().getDefault();
         Medicine m = new Medicine();