Unit test cases have to be written for each operation

[pavish]

Unit test cases for the following initial actions have to be written:

1. DOM rendering for the base element
2. Dropdown open close actions
3. DOM rendering for options menu - for predefined options
4. Searching through options - for predefined options
5. Selecting option - for predefined options
6. Async data fetching
7. Steps 3 to 5 for async data
8. DOM rendering for selecting/removing multiple options