Add unit test to test for distinct tags

Description

Describe the changes made in this merge request.

• Added more unit tests for demo

Issue

Issue # #6 (closed)

Feature

Describe the feature or functionality added

• Unit tests

Tophatting

Describe the steps to test your changes.

• Run the TodoListItem test impl file

Expected current behavior

What should you see or expect when you test this feature?

• PASSING TESTS!

Changes

Describe the changes you made part of this merge request

• n/a

Screenshots

Add any screenshots required

• n/a

Design Patterns

List any design patterns used to accomplish this task

• n/a

Deviations

Were there any deviations from the original design or architecture plan. If yes, what were they ?

Additional

• Unit test written
• Meets requirements
• Cross-browser tested
• Added/updated documentation as needed
• Camel case style used