Set up unit and integration testing

[vladokuskov]

This task involves establishing testing frameworks and writing test suites to verify the functionality and behavior of the application's components, both individually (unit testing) and in combination (integration testing).

Action Items:

• Choose Testing Frameworks: Select appropriate testing frameworks based on the technology stack of the application. For frontend testing, popular frameworks include Jest, Mocha, and Jasmine.
• Configure Testing Environment: Set up the testing environment with necessary dependencies and configurations, such as mocking libraries, test runners, and code coverage tools.
• Write Unit Tests: Create unit test suites to assess the functionality of individual components, such as functions, classes, and modules, in isolation from external dependencies. Focus on testing edge cases, error handling, and boundary conditions.
• Mock External Dependencies: Utilize mocking techniques (e.g., manual mocks, dependency injection) to isolate units under test from external dependencies, such as database access, API calls, and third-party services.
• Implement Integration Tests: Develop integration test suites to evaluate the interaction and integration of multiple components within the application, including backend services, frontend components, and external APIs.
• Define Test Scenarios: Identify and document test scenarios covering various user interactions, workflows, and use cases of the application. Prioritize critical paths and functionalities for comprehensive test coverage.
• Test Automation: Automate the execution of unit and integration tests using continuous integration (CI) tools and pipelines, such as GitHub Actions, to ensure consistent and frequent testing throughout the development lifecycle.
• Code Coverage Analysis: Monitor code coverage metrics to assess the effectiveness of test suites and identify areas of the codebase that require additional testing. Aim for high code coverage to mitigate the risk of undetected bugs and regressions.
• Integration with Version Control: Integrate testing workflows with version control systems (e.g., Git) to enforce testing requirements and prevent the merging of code changes that fail to meet testing criteria.
• Documentation: Document testing strategies, methodologies, and best practices for the development team to facilitate knowledge sharing and onboarding of new members.