Qual a diferença entre teste de regressão e teste de ponta a ponta

Qual a diferença entre teste de regressão e teste de ponta a ponta

Gostaria de saber a diferena entre estes dois testes, teste de regresso e teste de ponta a ponta. Procurei em alguns lugares mas achava material mais relacionado a TDD, e ambos se parecem um pouco. Outra dvida saber quando usar um ou outro nos testes de software, desde j agradeo.

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