Add tests for <Header> component

[kasya]

Write unit tests for the <Header> React component to ensure expected behavior, edge case handling, and rendering logic.

Essential Test Coverage Checklist

• Renders successfully with minimal required props
• Conditional rendering logic
• Prop-based behavior – different props affect output
• Event handling – simulate user actions and verify callbacks
• State changes / internal logic
• Default values and fallbacks
• Text and content rendering
• Handles edge cases and invalid inputs
• Accessibility roles and labels
• DOM structure / classNames / styles

Test Reference

You can refer to the AutoScrollToTop.test.tsx file for an example of structure and best practices.
To explore more examples, see the full component tests folder.

[prajwal-tech07]

I would like to work on it .please assign it to me .!!

[SOHAMPAL23]

@kasya I would like work on this Issue . Previously I have also contributed in the Making of the unit test case in Open Source Organisation .Can You assign me this .