test(email): extend email tests for providers

[JRocabruna]

Extend tests to achieve 90% code coverage

Description

This pull request extends the existing test suite to increase code coverage to 90%. It adds tests for various scenarios, including successful email sending, different SMTP authentication methods, handling different email content types, network failures, and invalid email addresses.

• Related Issue: Closes [FEATURE] - Extend tests to achieve 90% code coverage #8
• Type of Change:
  • New feature (non-breaking change which adds functionality)

Checklist

Please ensure the following guidelines are met:

• The code follows the style guidelines of this project.
• A self-review has been performed on the code.
• The code is well-documented, and comments have been added where necessary.
• Tests have been added to prove that the fix is effective or that the feature works. All existing tests pass.
• Commit messages follow the convention type(scope): description.
• The pull request has no conflicts with the base branch.
• Any dependent changes have been merged and published in downstream modules.

Additional Information

No additional dependencies are required for this change. The improvements to test coverage will enhance code reliability and maintainability.

[DarkRockMountain-admin]

Comments

The extended tests cover various scenarios, enhancing the code coverage. This improvement will increase the reliability and maintainability of the codebase.

Review Checklist

• Code adheres to the project's coding guidelines.
• Changes are well-documented.
• Tests have been added/updated and pass successfully.
• Commit messages follow the correct format: type(scope): description.
• No conflicts with the base branch.

Approval

Approved: Changes look good and meet the project's contribution standards.