Write a Unit Test for "Shimmer" component

[sunilk429]

Issue Description

The Shimmer component currently lacks any unit tests.

Expected Behavior

• Unit tests should be added for the Shimmer component to verify:
  • The component renders without crashing.
  • Default CSS classes are applied correctly
  • Additional classes are applied when passed as props.
  • The combination of default and custom classes works as expected.

Current Behavior

There are no unit tests for the Shimmer component in the project.

Reproducibility

• This issue is reproducible
• This issue is not reproducible

You can reproduce this issue by navigating to the _tests_ folder and confirming that there are no unit tests for the Shimmer component.

Steps to Reproduce

1. Navigate to the _tests_ folder.
2. Verify that no unit tests exist for the Shimmer component.

Severity/Priority

• Critical
• High
• Medium
• Low

Checklist

• I have read and followed the project's code of conduct.
• I have searched for similar issues before creating this one.
• I have provided all the necessary information to understand and reproduce the issue.
• I am willing to contribute to the resolution of this issue.