Test function for smartpen autoalign JS functions

[gbengaoluwadahunsi]

Motivation I created this pull request to implement Jest testing for the smartpen and mathtoolSmartpen classes in the application. Automated testing helps ensure the reliability and correctness of the codebase by automatically verifying the behavior of these classes. This ensures that any changes made to the classes do not introduce regressions or break existing functionality.

Testing The smartpen and mathtoolSmartpen classes were tested using Jest, a JavaScript testing framework. Unit tests were written to cover the initialization of properties in the smartpen class and the interpolation functionality in the mathtoolSmartpen class. These tests were run locally using Jest to ensure the functionality of the classes. Additionally, the tests were integrated into the CI/CD pipeline using GitHub Actions workflows to ensure consistent and reliable testing across different environments.