loader.mercurial: Increase coverage
As per my suggestion [1], transformed the loader verifier code into tests.
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loader_verifier: Transform the verifier into tests
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tests_tasks: Add scenario to check tasks are fine
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test_converters: Add coverage on converters
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Add scenario for archive mercurial loader (success + failure)
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[1] https://forge.softwareheritage.org/swh/devel/swh-environment#1411
Related swh-environment#1411 (closed) Related T1439 Related swh-environment#1443 (closed)
Test Plan
tox
Migrated from D802 (view on Phabricator)