Task/loading spinner test

[cleobnvntra]

Description

Added unit test for Loading Spinner component.

Closes #160

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?

The proposed approach focuses on validating the LoadingSpinner component’s rendering and styling based on settings and styles contexts. This approach includes:

1. Rendering Verification: A test to confirm that both the spinner container and spinner elements are correctly rendered in the DOM.

2. Primary Color Application: A test to ensure the spinner’s border color accurately reflects the primaryColor defined in the settings context, enhancing consistency with the overall theme.

3. Custom Style Application: A test that verifies additional styling from the styles context is correctly applied to the spinner. This includes properties like border-radius, width, and height, ensuring that custom styles are honored.

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)

[tjtanjin]

LGTM! 😊