t/unit-tests: add tests for the in-memory object source

While the in-memory object source is a full-fledged source, our code
base only exercises parts of its functionality because we only use it in
git-blame(1). Implement unit tests to verify that the yet-unused
functionality of the backend works as expected.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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