NH-3905 - Fix test which may lack async generation.

Author: fredericDelaporte

src/NHibernate.Test/Async/TypesTest/PersistentEnumTypeFixture.cs

@@ -95,4 +95,4 @@ public async Task CanWriteAndReadUsingBothHeuristicAndExplicitGenericDeclaration
 			}
 		}
 	}
-}
+}

src/NHibernate.Test/TypesTest/PersistentEnumTypeFixture.cs

@@ -136,6 +136,7 @@ public void CanWriteAndReadUsingBothHeuristicAndExplicitGenericDeclaration()
 		}
 	}
 
+	[TestFixture]
 	public class GenericEnumTypeTest
 	{
 		[Test]
@@ -145,4 +146,4 @@ public void TheNameShouldBeFullNameAndAssembly()
 			Assert.That(enumType.Name, Is.EqualTo(typeof(EnumType<B>).FullName + ", NHibernate"));
 		}
 	}
-}
+}

src/NHibernate.Test/TypesTest/TypeSqlTypeFixture.cs

@@ -19,6 +19,7 @@ public class MultiTypeEntity
 		public virtual string StringClob { get; set; }
 	}
 
+	[TestFixture]
 	public abstract class TypeSqlTypeFixture
 	{
 		protected const string TestNameSpace = "NHibernate.Test.TypesTest.";