Backend:

- Add Unit test for "CheckReminders" in ReminderScheduler
- Add Unit test for "getUpcomingReminders" in ReminderService

backend/src/test/java/com/github/tingshi2015/backend/reminder/ReminderSchedulerUnitTest.java

@@ -0,0 +1,47 @@
+package com.github.tingshi2015.backend.reminder;
+
+import lombok.RequiredArgsConstructor;
+import org.junit.jupiter.api.Test;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.util.List;
+
+import static org.mockito.Mockito.*;
+
+class ReminderSchedulerUnitTest {
+    ReminderService reminderService = mock(ReminderService.class);
+    NotificationService notificationService = mock(NotificationService.class);
+    ReminderScheduler reminderScheduler = new ReminderScheduler(reminderService, notificationService);
+
+
+    @Test
+    void checkReminders() {
+        //GIVEN
+        Reminder reminder1 = new Reminder("id1", "Drink Water!", LocalTime.now().withSecond(0).withNano(0), LocalDate.now());
+        Reminder reminder2 = new Reminder("id2", "Call Mama & Papa!",LocalTime.now().withSecond(0).withNano(0), LocalDate.now());
+
+        List<Reminder> reminders = List.of(reminder1, reminder2);
+
+        when(reminderService.getUpcomingReminders()).thenReturn(reminders);
+        //doNothing().when(notificationService).sendNotification(reminder1);   //---can be omitted!
+        //doNothing().when(notificationService).sendNotification(reminder2);   //---can be omitted!
+
+        //WHEN
+       reminderScheduler.checkReminders();
+
+        //THEN
+        verify(notificationService, times(1)).sendNotification(reminder1);
+        verify(notificationService, times(1)).sendNotification(reminder2);
+
+
+    }
+
+}
+
+
+
+

backend/src/test/java/com/github/tingshi2015/backend/reminder/ReminderServiceTest.java

@@ -6,6 +6,7 @@
 import java.time.LocalTime;
 import java.util.List;
 import java.util.NoSuchElementException;
+import java.util.stream.Collectors;
 
 import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.Mockito.*;
@@ -117,4 +118,22 @@ void  updateAReminder_withInvalidId_shouldThrowException(){
         assertEquals("Reminder with id: " + id + " not found. Can't update!", exception.getMessage());
     }
 
+
+    @Test
+    void  getUpcomingReminders(){
+        //GIVEN
+        Reminder upcomingReminder1 = new Reminder("id1", "Drink Water!", LocalTime.now().withSecond(0).withNano(0), LocalDate.now());
+        Reminder upcomingReminder2 = new Reminder("id2", "Call Mama & Papa!",LocalTime.now().withSecond(0).withNano(0), LocalDate.now());
+        List<Reminder> upcomingReminders = List.of(upcomingReminder1, upcomingReminder2);
+
+        when(reminderRepository.findAll()).thenReturn(upcomingReminders);
+
+        //WHEN
+        List<Reminder> actual = reminderService.getUpcomingReminders();
+
+        //THEN
+        verify(reminderRepository).findAll();
+        assertEquals(upcomingReminders, actual);
+    }
+
 }