[#79] Entities: Remove EF proxies

Tests/UnitTests/DocumentTests/Utils.cs

@@ -1,4 +1,5 @@
 using Elwig.Documents;
+using Elwig.Helpers;
 using NReco.PdfRenderer;
 using System.Text.RegularExpressions;
 
@@ -8,7 +9,9 @@ namespace Tests.UnitTests.DocumentTests {
         private static readonly string FileName = Path.Combine(Path.GetTempPath(), "test_document.pdf");
 
         public static async Task<string> GeneratePdfText(Document doc, bool preserveLayout = false) {
-            await doc.Generate();
+            using (var ctx = new AppDbContext()) {
+                await doc.Generate(ctx);
+            }
             try {
                 doc.SaveTo(FileName);
                 var conv = new PdfToTextConverter { CustomArgs = preserveLayout ? "-layout " : "-raw " };