test: use Multihash to create a valid dict for a Content object

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Migrated from D2953 (view on Phabricator)

mentioned in merge request !143 (closed)

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Rebasing onto ca7e9d20...

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commit 9c697f6812899d002ee411807fe85611b163a8b7
Author: David Douard <david.douard@sdfa3.org>
Date:   Thu Apr 2 15:18:00 2020 +0200

    test: use Multihash to create a valid dict for a Content object

See https://jenkins.softwareheritage.org/job/DJNL/job/tests-on-diff/5/ for more details.

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