[💄Feature]: Add unit tests.

[wiseaidev]

👶 Getting Started
Please search the history to see if an issue already exists for the same problem.

• I have searched the existing issues.
• I have tested the latest version.

📝 Describe the feature
While configuring jest, I noticed that it doesn't allow an es6 import statement. Then, I used babel to do the trick. But, it is not working. Therefore, you now see all the code in the popup file. Only this way jest seems to be working properly. We need to figure out an approach to make jest accept es6 import statements.

📸 Screenshots
N/A

🔦 Context
Have a look at #18