human
Here's a good function header given the following:
I wrote the below code

    class FailingFetchStrategy(spack.fetch_strategy.FetchStrategy, ):
        def fetch(self):
            raise spack.fetch_strategy.FailedDownloadError('<non-existent    URL>', 'This    implementation    of    FetchStrategy    always    fails')
    return FailingFetchStrategy()

What's a good function header?
assistant
#Here's a good function header.

@pytest.fixture()
def failing_fetch_strategy():