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This section details on the original issue you should resolve

<issue_title>[Idea] Load test blog posts for testing/development</issue_title>
<issue_description>I would find it beneficial to have something like a load/generate X blog posts just for testing/development purposes. Currently if I need to test behavior like the next/previous buttons I need to manually enter X blog posts to test my new changes. Also if you are using the Sqlite in memory option (I do this for developing new features as its the default with no extra config) your test blog posts will be removed upon reloading.

Or is there an easy way I am missing? Maybe I just need to setup a local test blog database and point to that. Or could we include a small test database in repo?</issue_description>

<agent_instructions>Create a new extension method called "UseDummyData" that fulfills the requirement and uses its own implementation of the "IRepository" (use in memory for example via SQLite).
DummyData should have an optional "DummyDataOptions" object for example how many blog posts have to be created. </agent_instructions>

Comments on the Issue (you are @copilot in this section)

@linkdotnet That is a good idea - to make that work across the board, we can also offer something like: ```diff if (builder.Environment.IsDevelopment()) { builder.Services.UseDummyAuthentication(); + builder.Services.UseDummyData(); } ```

We probably don't need this enabled all the time. We basically can create our own IRepository<BlogPost> for that behind the facade so we have a very specific (and predefined) set of blog posts.</comment_new>