Add the tests for the config manager

Fix the photo and travel diary relationship to properly work

src/pilgrim/models/photo.py

@@ -26,6 +26,7 @@ class Photo(Base):
     )
 
     fk_travel_diary_id = Column(Integer, ForeignKey("travel_diaries.id"), nullable=False)
+    travel_diary = relationship("TravelDiary", back_populates="photos")
     __table_args__ = (
         Index('idx_photo_hash_diary', 'hash', 'fk_travel_diary_id'),
     )

src/pilgrim/models/travel_diary.py

@@ -13,6 +13,7 @@ class TravelDiary(Base):
     name = Column(String, nullable=False)
     directory_name = Column(String, nullable=False, unique=True)
     entries = relationship("Entry", back_populates="travel_diary", cascade="all, delete-orphan")
+    photos = relationship("Photo", back_populates="travel_diary", cascade="all, delete-orphan")
 
     __table_args__ = (
         UniqueConstraint('directory_name', name='uq_travel_diary_directory_name'),

tests/utils/test_config_manager.py

@@ -0,0 +1,67 @@
+import pytest
+import tomli
+from pathlib import Path
+from unittest.mock import patch
+
+from pilgrim.utils.config_manager import ConfigManager, SingletonMeta
+from pilgrim.utils.directory_manager import DirectoryManager
+
+@pytest.fixture
+def clean_singleton():
+    SingletonMeta._instances = {}
+
+@patch('pilgrim.utils.config_manager.DirectoryManager.get_config_directory')
+def test_create_default_config_if_not_exists_with_decorator(mock_get_config_dir, tmp_path: Path, clean_singleton):
+    mock_get_config_dir.return_value = str(tmp_path)
+    manager = ConfigManager()
+    config_file = tmp_path / "config.toml"
+    assert not config_file.exists()
+    manager.read_config()
+    assert config_file.exists()
+    assert manager.database_type == "sqlite"
+
+@patch('pilgrim.utils.config_manager.DirectoryManager.get_config_directory')
+def test_read_existing_config_with_decorator(mock_get_config_dir, tmp_path: Path, clean_singleton):
+    mock_get_config_dir.return_value = str(tmp_path)
+    custom_config_content = """
+    [database]
+    url = "/custom/path/to/db.sqlite"
+    type = "custom_sqlite"
+    [settings.diary]
+    auto_open_diary_on_startup = "MyCustomDiary"
+    auto_open_on_creation = true
+    """
+    config_file = tmp_path / "config.toml"
+    config_file.write_text(custom_config_content)
+
+    manager = ConfigManager()
+    manager.read_config()
+    assert manager.database_url == "/custom/path/to/db.sqlite"
+    assert manager.database_type == "custom_sqlite"
+
+@patch('pilgrim.utils.config_manager.DirectoryManager.get_config_directory')
+def test_save_config_writes_changes_to_file_with_decorator(mock_get_config_dir, tmp_path: Path, clean_singleton):
+    mock_get_config_dir.return_value = str(tmp_path)
+    manager = ConfigManager()
+    manager.read_config()
+    manager.set_database_url("/novo/caminho.db")
+    manager.set_auto_open_new_diary(True)
+    manager.save_config()
+    config_file = tmp_path / "config.toml"
+    with open(config_file, "rb") as f:
+        data = tomli.load(f)
+        assert data["database"]["url"] == "/novo/caminho.db"
+        assert data["settings"]["diary"]["auto_open_on_creation"] is True
+
+@patch('pilgrim.utils.config_manager.DirectoryManager.get_config_directory')
+def test_read_config_raises_error_on_malformed_toml(mock_get_config_dir, tmp_path: Path, clean_singleton):
+    mock_get_config_dir.return_value = str(tmp_path)
+    invalid_toml_content = """
+       [database]
+       url = /caminho/sem/aspas
+       """
+    config_file = tmp_path / "config.toml"
+    config_file.write_text(invalid_toml_content)
+    manager = ConfigManager()
+    with pytest.raises(ValueError, match="Invalid TOML configuration"):
+        manager.read_config()