Create a test project referencing both AocAgent package and the project with day implementations, as well as the NUnit package.

Opt out of agent generation setting the false value for a special property in the csproj file.

<ItemGroup>
  <CompilerVisibleProperty Include="AoCAgent_GenerateAgent" />
</ItemGroup>
<PropertyGroup>
  <AoCAgent_GenerateAgent>false</AoCAgent_GenerateAgent>
</PropertyGroup>

Define a class decorated with the [GenerateExampleTests] attribute.

[GenerateExampleTests]
internal partial class ExampleTests;

The class now becomes a test fixture collecting examples from all the Days with a test method verifying them.

Define a class decorated with the [GenerateInputTests] attribute and provide your answers to puzzles. This will also require manually downloading your personal inputs.

[GenerateInputTests(nameof(GetCases))]
internal partial class InputTests
{
    private static IEnumerable<PartInputCaseData> GetCases()
    {
        yield return new (1, 1, "56049");
    }
}

The class now becomes a test fixture verifying the solutions using inputs from the files.