During development of a new feature, I noticed a bug occuring only after using
the new feature for several days. This was because the metadata only infrequently
changes in ways which cause certain code paths to be hit. By having the f-droid.org
metadata from several days apart in the test suite, it allows for testing more
of these cases. In the future, even later versions of the metadata can be added
to ensure that we can update happily from old to new metadata.
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