test: adding unit tests for buttonBuilder

[Nandinibajaj16]

Description

Please include a brief summary of the change and include the relevant issue(s).

Closes #194

What change does this PR introduce?

Please select the relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (changes to docs/code comments)

What is the proposed approach?

Please give a short overview/explanation on the approach taken to resolve the issue(s).

Checklist:

• The commit message follows our adopted guidelines
• Testing has been done for the change(s) added (for bug fixes/features)
• Relevant comments/docs have been added/updated (for bug fixes/features)

[Nandinibajaj16]

@tjtanjin can you help here why the build is failing?

[tjtanjin]

@tjtanjin can you help here why the build is failing?

Hey @Nandinibajaj16, it's not your issue haha 😅 Try merging into master.

[Nandinibajaj16]

@tjtanjin can you review now, this would be my last PR for hacktober, thanks.

[tjtanjin]

LGTM! 😊