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Olá!
Vi que o projeto não possuía testes unitários e como estou me dedicando no aprendizado deste assunto resolvi escrevê-los. Utilizei a ferramenta PHPUnit com Xdebug. Consegui 96.20% de cobertura.
Saliento que não alterei o código fonte do projeto (em "src/") , apenas escrevi os testes e inclui alguns arquivos de configuração do Docker, caso alguém deseje rodar os testes desta forma. Apesar de me limitar somente aos testes identifiquei algumas melhorias que poderão ser implementadas nas versões futuras.
Bom, espero ter ajudado! ^^