On 16 Feb 2016 05:57, "Ben Finney" <ben+pyt...@benfinney.id.au> wrote:
>
> Cameron Simpson <c...@zip.com.au> writes:
>
> > I've been watching this for a few days, and am struggling to
> > understand your use case.
>
> Yes, you're not alone. This surprises me, which is why I'm persisting.
>
> > Can you elaborate with a concrete example and its purpose which would
> > work with a mktemp-ish official function?
>
> An example::
>
> import io
> import tempfile
> names = tempfile._get_candidate_names()
>
> def test_frobnicates_configured_spungfile():
> """ ‘foo’ should frobnicate the configured spungfile. """
>
> fake_file_path = os.path.join(tempfile.gettempdir(), names.next())
> fake_file = io.BytesIO("Lorem ipsum, dolor sit
amet".encode("utf-8"))
>
> patch_builtins_open(
> when_accessing_path=fake_file_path,
> provide_file=fake_file)
>
> system_under_test.config.spungfile_path = fake_file_path
> system_under_test.foo()
> assert_correctly_frobnicated(fake_file)
If you're going to patch open to return a fake file when asked to open
fake_file_path why do you care whether there is a real file of that name?
--
Oscar
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