I think setting a patch mock's side_effect to raise an exception is a valid
use case.

In this example, we're simulating a blockchain error in an API that we're
coding, and testing that instead of a 500 Internal Server Error, our API
returns a 400 with a nice error message:

with mock.patch('yourapi.w3.eth') as thing:
    eth.sendRawTransaction.side_effect = lambda: raise SomeException('some
message')
    result = testclient.post('/yourapi')
    assert result.status_code == 400
    assert result.message = 'some message'
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