fix: Resolved the maintainability issues

[Prekshith-Microsoft]

This pull request primarily refactors and cleans up the test codebase, focusing on improving test reliability and consistency. The changes include standardizing test class inheritance, updating test assertions for clarity, and removing unused imports. Below are the most important changes grouped by theme:

Test Class Inheritance and Imports:

• Standardized test class inheritance by replacing direct references to unittest.TestCase and unittest.IsolatedAsyncioTestCase with imports of TestCase and IsolatedAsyncioTestCase from unittest, and updated the main entry point to use main() instead of unittest.main() in test_settings.py. [1] [2] [3] [4] [5] [6] [7] [8] [9]
• Removed unused imports in test_settings.py for a cleaner codebase.

Test Logic and Assertions:

• Improved exception handling in test_database_base.py by explicitly checking that an exception was raised and that cleanup logic was executed, making the test intent clearer.
• Enhanced async test assertions in test_settings.py by capturing awaited values and asserting task completion, improving test robustness. [1] [2]

Code Cleanup:

• Removed unused import of MStep from test_plan_to_mplan_converter.py for clarity.This pull request primarily refactors and cleans up unit tests across multiple backend test files. The main focus is on improving test structure, updating test class inheritance for consistency, and making minor enhancements to test assertions and imports. No production code is changed; all modifications are confined to test files.

Test structure and inheritance improvements:

• Standardized test class inheritance by replacing explicit unittest.TestCase and unittest.IsolatedAsyncioTestCase references with imported TestCase and IsolatedAsyncioTestCase throughout test_settings.py for consistency and clarity. [1] [2] [3] [4] [5] [6] [7]
• Updated the test runner invocation to use the imported main() function instead of unittest.main() in test_settings.py.
• Cleaned up imports by removing unused modules and consolidating imports in test_settings.py.

Test assertion and logic enhancements:

• Improved exception handling and assertion logic in test_database_base.py to explicitly check that exceptions are raised and cleanup occurs as expected.
• Added assertions to verify task completion in asynchronous test cases in test_settings.py. [1] [2]

Other test maintenance:

• Removed an unused import (MStep) from test_plan_to_mplan_converter.py.## Purpose

• ...

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[Copilot]

Pull request overview

This PR refactors backend unit tests to improve consistency and reduce unused imports, primarily by standardizing unittest base class usage and tightening a few async test assertions.

Changes:

• Standardize unittest usage in test_settings.py (import TestCase / IsolatedAsyncioTestCase / main, update inheritance, and use main()).
• Minor async test adjustments in test_settings.py (capture awaited cancelled task result and add task completion assertions).
• Remove an unused model import (MStep) from test_plan_to_mplan_converter.py.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/tests/backend/v4/orchestration/helper/test_plan_to_mplan_converter.py	Removes unused MStep import to clean up the test module.
src/tests/backend/v4/config/test_settings.py	Standardizes unittest imports/inheritance and makes small async assertion tweaks.
src/tests/backend/common/database/test_database_base.py	Refactors exception/cleanup test logic for the async context manager.

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