Añadir chequeos de coverage al código en Python

Probablemente utilizar [pytest-cov](https://pypi.org/project/pytest-cov/). Luego se decidirá el umbral de coverage. Por otro lado, se debe dejar configurado el plugin.

No files or tests are named. Start by locating the Python test configuration and existing pytest setup, then review how pytest-cov would be configured. The threshold still needs to be decided; done means the plugin is configured and coverage checks run against the Python code.

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