Add test

Author: alec-petersen

samples/client/petstore/csharp/generichost/net8/ManualPetstoreTests/OpenAPIClient-generichost-manual-tests/UnitTest1.cs

@@ -189,5 +189,15 @@ public void Animal()
             string result = JsonSerializer.Serialize(animal, _jsonSerializerOptions);
             Assert.AreEqual(expected, result);
         }
+
+        [TestMethod]
+        public void Enum(){
+            string expected = """["UPPER","lower","","Value\twith tab","Value with \" quote","Value with escaped \" quote","Duplicate\nvalue","Duplicate\r\nvalue","null"]""";
+            List<EnumTest?> enumList = new List<EnumTest?>() { EnumTest.UPPER, EnumTest.Lower, EnumTest.Empty, EnumTest.ValuewithTab, EnumTest.ValueWithQuote, EnumTest.ValueWithEscapedQuote, EnumTest.Duplicatevalue, EnumTest.Duplicatevalue2, null };
+            string result = JsonSerializer.Serialize(enumList, _jsonSerializerOptions);
+            Assert.AreEqual(expected, result);
+            List<EnumTest?> enumListResult = JsonSerializer.Deserialize<List<EnumTest?>>(expected, _jsonSerializerOptions);
+            Assert.AreEqual(enumList, enumListResult);
+        }
     }
 }