Refactor test cases for improved readability and consistency

- Updated test functions in various test files to enhance code clarity by formatting long lines and improving indentation.
- Adjusted assertions to use multi-line formatting for better readability.
- Added new test cases for theme settings API to ensure proper functionality.
- Ensured consistent use of line breaks and spacing across test files for uniformity.

tests/unit/test_theme_settings.py

@@ -0,0 +1,63 @@
+import pytest
+from sqlalchemy.orm import Session
+from fastapi.testclient import TestClient
+
+from main import app
+from models.theme_setting import ThemeSetting
+from services.settings import save_theme_settings, get_theme_settings
+
+
+client = TestClient(app)
+
+
+def test_save_theme_settings(db_session: Session):
+    theme_data = {
+        "theme_name": "dark",
+        "primary_color": "#000000",
+        "secondary_color": "#333333",
+        "accent_color": "#ff0000",
+        "background_color": "#1a1a1a",
+        "text_color": "#ffffff"
+    }
+
+    saved_setting = save_theme_settings(db_session, theme_data)
+    assert str(saved_setting.theme_name) == "dark"
+    assert str(saved_setting.primary_color) == "#000000"
+
+
+def test_get_theme_settings(db_session: Session):
+    # Create a theme setting first
+    theme_data = {
+        "theme_name": "light",
+        "primary_color": "#ffffff",
+        "secondary_color": "#cccccc",
+        "accent_color": "#0000ff",
+        "background_color": "#f0f0f0",
+        "text_color": "#000000"
+    }
+    save_theme_settings(db_session, theme_data)
+
+    settings = get_theme_settings(db_session)
+    assert settings["theme_name"] == "light"
+    assert settings["primary_color"] == "#ffffff"
+
+
+def test_theme_settings_api(api_client):
+    # Test API endpoint for saving theme settings
+    theme_data = {
+        "theme_name": "test_theme",
+        "primary_color": "#123456",
+        "secondary_color": "#789abc",
+        "accent_color": "#def012",
+        "background_color": "#345678",
+        "text_color": "#9abcde"
+    }
+
+    response = api_client.post("/api/settings/theme", json=theme_data)
+    assert response.status_code == 200
+    assert response.json()["theme"]["theme_name"] == "test_theme"
+
+    # Test API endpoint for getting theme settings
+    response = api_client.get("/api/settings/theme")
+    assert response.status_code == 200
+    assert response.json()["theme_name"] == "test_theme"