add tests for postavailability and reservation summary

internal/repository/dbrepo/test-repo.go

@@ -41,6 +41,17 @@ func (m *testDBRepo) SearchAvailabilityByDatesByRoomID(start, end time.Time, roo
 // SearchAvailabilityForAllRooms returns a slice of rooms, if any, for given date range
 func (m *testDBRepo) SearchAvailabilityForAllRooms(start, end time.Time) ([]models.Room, error) {
 	var rooms []models.Room
+	if start.Format("2006-01-02") == "2050-01-01" && end.Format("2006-01-02") == "2050-01-02" {
+		room := models.Room{
+			RoomName: "room",
+			ID:       1,
+		}
+		rooms = append(rooms, room)
+		return rooms, nil
+	}
+	if start.Format("2006-01-02") == "2050-01-03" && end.Format("2006-01-02") == "2050-01-04" {
+		return rooms, errors.New("deliberate error")
+	}
 	return rooms, nil
 }