Added Mocks to help aid the process of creation of the textual TUI

src/pilgrim/service/mocks/photo_service_mock.py

@@ -0,0 +1,42 @@
+from pathlib import Path
+from typing import List
+
+from pilgrim.models.photo import Photo
+from pilgrim.service.photo_service import PhotoService
+
+
+class PhotoServiceMock(PhotoService):
+    def __init__(self):
+        super().__init__(None)
+        self.mock_data = {}
+        self._next_id = 1
+
+    def create(self, filepath: Path, name: str, travel_diary_id, addition_date=None, caption=None) -> Photo | None:
+        new_photo = Photo(filepath, name, addition_date=addition_date, caption=caption)
+        self.mock_data[self._next_id] = new_photo
+        self._next_id += 1
+        return new_photo
+
+
+    def read_by_id(self, photo_id: int) -> Photo:
+        return self.mock_data.get(photo_id)
+
+    def read_all(self) -> List[Photo]:
+        return list(self.mock_data.values())
+
+    def update(self, photo_id: Photo, photo_dst: Photo) -> Photo | None:
+        item_to_update:Photo = self.mock_data.get(photo_id)
+        if item_to_update:
+            item_to_update.filepath = photo_dst.filepath if photo_dst.filepath else item_to_update.filepath
+            item_to_update.name = photo_dst.name if photo_dst.name else item_to_update.name
+            item_to_update.caption = photo_dst.caption if photo_dst.caption else item_to_update.caption
+            item_to_update.addition_date = photo_dst.addition_date if photo_dst.addition_date\
+                else item_to_update.addition_date
+            item_to_update.fk_travel_diary_id = photo_dst.fk_travel_diary_id if photo_dst.fk_travel_diary_id \
+                else item_to_update.fk_travel_diary_id
+            item_to_update.entries.extend(photo_dst.entries)
+            return item_to_update
+        return None
+
+    def delete(self, photo_id: int) -> Photo | None:
+        return self.mock_data.pop(photo_id, None)