Set Up Testing Framework and Write Tests for Existing Components

[timDeHof]

Our project currently lacks a testing framework. We need to set up a testing framework like Jest and write unit and integration tests for existing components and utilities. This will help us ensure that our application is reliable and maintainable.

Acceptance Criteria:

• Set up Jest (or another testing framework) in the project.
• Write unit tests for at least 5 existing components.
• Write integration tests for critical workflows.
• Document how to run tests in the README.