[FEATURE] Add tests

[guibranco]

Description
We need to implement unit tests for the library to ensure code quality and functionality. The unit tests should cover various aspects of the library's functionality and should be written using the following testing frameworks and libraries:

• XUnit: A popular testing framework for .NET applications.

  • NuGet: XUnit
  • GitHub: XUnit Repository

• NSubstitute: A friendly substitute for .NET mocking.

  • NuGet: NSubstitute
  • GitHub: NSubstitute Repository

• Bogus: A simple and sane library for generating fake data.

  • NuGet: Bogus
  • GitHub: Bogus Repository

• FluentAssertions: A library that provides a more readable way to assert conditions in tests.

  • NuGet: FluentAssertions
  • GitHub: FluentAssertions Repository

Acceptance Criteria

• Create unit tests that cover the core functionalities of the library.
• Ensure tests are comprehensive and utilize XUnit for testing framework, NSubstitute for mocking dependencies, Bogus for generating test data, and FluentAssertions for more readable assertions.
• All tests should pass successfully and be included in the CI/CD pipeline.

Additional Context
Please ensure that the unit tests follow best practices for writing clean, maintainable code. Consider edge cases and error handling in your tests.

[gitauto-ai[bot]]

@guibranco Pull request completed! Check it out here https://github.com/guibranco/VTEX-SDK-dotnet/pull/284 🚀

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