Verificando a mensagem de erro diretamente #8
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A função "raises" do pytest possui um parâmetro "match" que serve para verificar a mensagem diretamente dentro do contexto que gera um exceção esperada. Como a mensagem testada é literal, é necessário escapar de expressões regulares (usadas por padrão).
Referência:
https://docs.pytest.org/en/7.1.x/reference/reference.html#pytest.raises