Convert test_metadata from unittest to pytest

A future commit will need pytest parametrization

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Migrated from D7891 (view on Phabricator)

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Patch application report for D7891 (id=28470)

Rebasing onto f69131fb...

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commit 32236e69ebebbdb1839dbc484d962329a2c70c84
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Wed May 25 13:21:35 2022 +0200

    Convert test_metadata from unittest to pytest
    
    A future commit will need pytest parametrization

See https://jenkins.softwareheritage.org/job/DCIDX/job/tests-on-diff/229/ for more details.

skimmed through but this lgtm

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approved this merge request

Merge request was merged

closed