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/conftest.py

@@ -27,7 +27,8 @@ engine = create_engine(
     poolclass=StaticPool,
 )
 TestingSessionLocal = sessionmaker(
-    autocommit=False, autoflush=False, bind=engine)
+    autocommit=False, autoflush=False, bind=engine
+)
 
 
 @pytest.fixture(scope="session", autouse=True)
@@ -37,19 +38,24 @@ def setup_database() -> Generator[None, None, None]:
         application_setting,
         capex,
         consumption,
+        currency,
         distribution,
         equipment,
         maintenance,
         opex,
         parameters,
         production_output,
+        role,
         scenario,
         simulation_result,
+        theme_setting,
+        user,
     )  # noqa: F401 - imported for side effects
 
     _ = (
         capex,
         consumption,
+        currency,
         distribution,
         equipment,
         maintenance,
@@ -57,8 +63,11 @@ def setup_database() -> Generator[None, None, None]:
         opex,
         parameters,
         production_output,
+        role,
         scenario,
         simulation_result,
+        theme_setting,
+        user,
     )
 
     Base.metadata.create_all(bind=engine)
@@ -86,22 +95,23 @@ def api_client(db_session: Session) -> Generator[TestClient, None, None]:
         finally:
             pass
 
-    from routes import dependencies as route_dependencies
+    from routes.dependencies import get_db
 
-    app.dependency_overrides[route_dependencies.get_db] = override_get_db
+    app.dependency_overrides[get_db] = override_get_db
 
     with TestClient(app) as client:
         yield client
 
-    app.dependency_overrides.pop(route_dependencies.get_db, None)
+    app.dependency_overrides.pop(get_db, None)
 
 
 @pytest.fixture()
-def seeded_ui_data(db_session: Session) -> Generator[Dict[str, Any], None, None]:
+def seeded_ui_data(
+    db_session: Session,
+) -> Generator[Dict[str, Any], None, None]:
     """Populate a scenario with representative related records for UI tests."""
     scenario_name = f"Scenario Alpha {uuid4()}"
-    scenario = Scenario(name=scenario_name,
-                        description="Seeded UI scenario")
+    scenario = Scenario(name=scenario_name, description="Seeded UI scenario")
     db_session.add(scenario)
     db_session.flush()
 
@@ -161,7 +171,9 @@ def seeded_ui_data(db_session: Session) -> Generator[Dict[str, Any], None, None]
             iteration=index,
             result=value,
         )
-        for index, value in enumerate((950_000.0, 975_000.0, 990_000.0), start=1)
+        for index, value in enumerate(
+            (950_000.0, 975_000.0, 990_000.0), start=1
+        )
     ]
 
     db_session.add(maintenance)
@@ -196,11 +208,15 @@ def seeded_ui_data(db_session: Session) -> Generator[Dict[str, Any], None, None]
 
 
 @pytest.fixture()
-def invalid_request_payloads(db_session: Session) -> Generator[Dict[str, Any], None, None]:
+def invalid_request_payloads(
+    db_session: Session,
+) -> Generator[Dict[str, Any], None, None]:
     """Provide reusable invalid request bodies for exercising validation branches."""
     duplicate_name = f"Scenario Duplicate {uuid4()}"
-    existing = Scenario(name=duplicate_name,
-                        description="Existing scenario for duplicate checks")
+    existing = Scenario(
+        name=duplicate_name,
+        description="Existing scenario for duplicate checks",
+    )
     db_session.add(existing)
     db_session.commit()