Add fixture and tests for the backup service

tests/service/test_backup_service.py

@@ -0,0 +1,39 @@
+import zipfile
+from pathlib import Path
+from unittest.mock import patch, MagicMock
+from pilgrim.service.backup_service import BackupService
+from pilgrim.utils.directory_manager import DirectoryManager
+import pytest
+
+@patch.object(DirectoryManager, 'get_diaries_root')
+@patch.object(DirectoryManager, 'get_config_directory')
+@patch.object(DirectoryManager, 'get_database_path')
+def test_create_backup_success(mock_get_db_path, mock_get_config_dir, mock_get_diaries_root, backup_test_env_files_only):
+    env = backup_test_env_files_only
+    session = env["session"]
+    mock_get_db_path.return_value = env["db_path"]
+    mock_get_config_dir.return_value = env["config_dir"]
+    mock_get_diaries_root.return_value = env["diaries_root"]
+
+    service = BackupService(session)
+    backup_zip_path = env["config_dir"] / "backup.zip"
+    success, returned_path = service.create_backup()
+    assert success is True
+    assert returned_path == backup_zip_path
+    assert backup_zip_path.exists()
+
+    with zipfile.ZipFile(backup_zip_path, 'r') as zf:
+        file_list = zf.namelist()
+        assert "database.sql" in file_list
+        assert "diaries/viagem_de_teste/images/foto1.jpg" in file_list
+        sql_dump = zf.read("database.sql").decode('utf-8')
+        assert "Viagem de Teste" in sql_dump
+
+@patch.object(DirectoryManager, 'get_database_path')
+def test_create_backup_fails_if_db_not_found(mock_get_db_path, tmp_path: Path):
+    non_existent_db_path = tmp_path / "non_existent.db"
+    mock_get_db_path.return_value = non_existent_db_path
+    mock_session = MagicMock()
+    service = BackupService(mock_session)
+    with pytest.raises(FileNotFoundError, match="No Database Found"):
+        service.create_backup()