DocumentSessionFactory.cs

public class DocumentSessionFactory : IDisposable
{
    private readonly IDocumentStore documentStore;

    public DocumentSessionFactory()
    {
        documentStore = new EmbeddableDocumentStore { RunInMemory = true };
        documentStore.Initialize();
    }

    public IAsyncDocumentSession CreateSession()
    {
        var db = string.Format("db-{0:N}", Guid.NewGuid());

        // Throws `NullReferenceException` w/ v1.2.2085-unstable from nuget.
        return documentStore.OpenAsyncSession(db);
    }

    public void Dispose()
    {
        if (documentStore != null)
        {
            documentStore.Dispose();
        }
    }
}

public static class RavenHelper
{
    public static IDocumentStore NewDatabase()
    {
        var documentStore = new EmbeddableDocumentStore
        {
            Configuration =
            {
                RunInUnreliableYetFastModeThatIsNotSuitableForProduction = true,
                RunInMemory = true,
            }
        };
        documentStore.Initialize();

        return documentStore;
    }
}

This will return a new document store. You can either use it per Fixture or per Unit test. I also like to call IndexCreation and seed all my indexes as well.

Oh, wow. I didn't notice that property. Thanks!

FWIW RunInUnreliableYetFastModeThatIsNotSuitableForProduction https://groups.google.com/forum/?fromgroups=#!topic/ravendb/vkiqoiZ6Fsc doesn't seem like it matters at all. RunIN... is for Esent and RunInMemory = Munin