Improve the new DefaultProcessorTest
>>> [!note] Migrated issue
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<!-- Migrated from issue #3383550. -->
Reported by: [dcam](https://www.drupal.org/user/1791830)
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<p>While I was working on the fix for <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/aggregator/-/work_items/1695852" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/aggregator/-/work_items/1695852</a></span> I didn't entirely like the test that I wrote because it had an obvious flaw: I was only validating that the number of Item entities matched the number that we expect. But that's no guarantee that the Items that were created are the <em>same</em> items that we expect. So I want to correct that flaw. Please feel free to suggest other possible improvements.</p>
<p>My intent here is to improve the results of the test, not add more assertions for the plugin functionality. But I suppose we could do both.</p>
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