test(SideNav): #17491 increased unit test coverage

[ashna000]

Closes #17491

This PR adds unit tests for the SideNav component to ensure its proper rendering and functionality. These tests ensure that this component renders with the appropriate class names, accommodates custom class names, and correctly applies additional props.

Changelog
Changed

• Added Unit test file for SideNav.

Testing / Reviewing

• Run the test suite to ensure that all new tests pass.
• Review the tests for clarity and coverage.

Additional Notes
Please let me know if any further modifications are needed or if you have any questions regarding the changes.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.45%. Comparing base (0810fa1) to head (366daff).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17869      +/-   ##
==========================================
+ Coverage   80.19%   80.45%   +0.25%     
==========================================
  Files         406      406              
  Lines       14041    14041              
  Branches     4399     4347      -52     
==========================================
+ Hits        11260    11296      +36     
+ Misses       2614     2579      -35     
+ Partials      167      166       -1     

☔ View full report in Codecov by Sentry.
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[ashna000]

@kennylam , @guidari Please review this PR

[guidari]

LGTM! 🚀
I see that there are couple line that weren't tested, but I guess those lines are not possible to be tested, right?
https://app.codecov.io/gh/carbon-design-system/carbon/pull/17869/blob/packages/react/src/components/UIShell/SideNav.tsx

[ashna000]

@kennylam Please review this PR

[ashna000]

@alisonjoseph Please review this PR

[guidari]

Hey @ashna000
Looks like the Files changetestd is missing the test file for some reason. Maybe got lost in a commit.

[ashna000]

Hey @ashna000 Looks like the Files changetestd is missing the test file for some reason. Maybe got lost in a commit.

@guidari @kennylam It seems while updating the branch the test changes got missed. I have updated the tests. Please review.

[guidari]

Hey @ashna000 Do you think you could test the onMouseLeave and onMouseEnter as well?

Example in carbon:

carbon/packages/react/src/components/Menu/Menu-test.js

Lines 151 to 156 in 1232b5e

	await act(() => {
	fireEvent.mouseLeave(
	screen.getByRole('menuitem', { name: 'Submenu Submenu' })
	);
	jest.runOnlyPendingTimers();
	});

Example in Stack Overflow: https://stackoverflow.com/questions/75952818/how-to-write-jest-test-case-for-moveover-and-mouseleave-for-functional-component#:~:text=simulate(%27-,mouseleave,-%27)%3B%0A%20%20%20%20expect