Tests: Add CreditNoteTest

Tests/DocumentTests/DeliveryNoteTest.cs

@@ -39,11 +39,11 @@ namespace Tests.DocumentTests {
             var text = await Utils.GeneratePdfText(doc);
             Assert.Multiple(() => {
                 Assert.That(text, Contains.Substring("""
-                W&B Weinbauer GesbR
-                WEINBAUER Wernhardt
-                Winzerstraße 2
-                2223 Hohenruppersdorf
-                """));
+                    W&B Weinbauer GesbR
+                    WEINBAUER Wernhardt
+                    Winzerstraße 2
+                    2223 Hohenruppersdorf
+                    """));
                 Assert.That(text, Contains.Substring("4725836"));  // Betriebsnummer
                 Assert.That(text, Contains.Substring("pauschaliert"));
                 Assert.That(text, Contains.Substring($"Wolkersdorf, am {DateTime.Now:dd.MM.yyyy}"));