feat: insert test spinner and coverage command

[DevJoaoLopes]

Overview

• creation of unit test for component Spinner
• command insertion for generating reports yarn coverage

Screenshots (if applicable)

• When executing the yarn coverage command, a folder called coverage containing the file below is generated in the project root.
• Command: yarn coverage
• Path where the generated file is located:

• Open file index.html:

Documentation

• [ ] Updated Typescript types and/or component PropTypes
• [ ] Added / modified component docs
• [ ] Added / modified Storybook stories

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