Fix some tests

test/UnitTests/MSTestAdapter.UnitTests/Discovery/AssemblyEnumeratorTests.cs

@@ -393,6 +393,12 @@ private static Mock<TestableAssembly> CreateMockTestableAssembly()
                 true))
             .Returns(Array.Empty<Attribute>());
 
+        mockAssembly
+            .Setup(a => a.GetCustomAttributes(
+                typeof(TestDataSourceOptionsAttribute),
+                true))
+            .Returns(Array.Empty<Attribute>());
+
         mockAssembly
             .Setup(a => a.GetCustomAttributes(
 #pragma warning disable CS0618 // Type or member is obsolete