Addition of unit tests for FirstStep.js

[Tanmay1201]

Fixes #115

Description

Added unit test cases for the component FirstStep.js using Jest

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the master branch of the repository.
• My commit messages follow [best practices][best_practices].
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[akmadian]

Good start! Please address my comment and I'll do another review

[akmadian]

Looks good! Thanks for working on this :)