diff --git a/src/libraries/System.Runtime/tests/System/Attributes.cs b/src/libraries/System.Runtime/tests/System/Attributes.cs
index 65db042cb59f3..3dda3f56b3566 100644
--- a/src/libraries/System.Runtime/tests/System/Attributes.cs
+++ b/src/libraries/System.Runtime/tests/System/Attributes.cs
@@ -283,27 +283,6 @@ private static void GenericAttributesTestHelper<TGenericParameter>(Func<Type, At
             Assert.Equal(1, closedGenericAttributes.Length);
             Assert.Equal(typeof(GenericAttribute<TGenericParameter>[]), closedGenericAttributes.GetType());
         }
-
-        [Fact]
-        public static void GetCustomAttributesBehaviorMemberInfoReturnsStringArray()
-        {
-            FieldInfo field = new CustomFieldInfo(new[] { "a" });
-            Assert.Throws<InvalidCastException>(() => Attribute.GetCustomAttributes(field));
-        }
-
-        [Fact]
-        public static void GetCustomAttributesBehaviorMemberInfoReturnsAttributeInObjectArray()
-        {
-            FieldInfo field = new CustomFieldInfo(new object[] { new TestAttribute(0) });
-            Assert.Throws<InvalidCastException>(() => Attribute.GetCustomAttributes(field));
-        }
-
-        [Fact]
-        public static void GetCustomAttributesBehaviorMemberInfoReturnsStringAndAttributeInObjectArray()
-        {
-            FieldInfo field = new CustomFieldInfo(new object[] { "a", new TestAttribute(0) });
-            Assert.Throws<InvalidCastException>(() => Attribute.GetCustomAttributes(field));
-        }
     }
 
     public static class GetCustomAttribute
@@ -937,33 +916,4 @@ public void Method([GenericAttribute<ulong>] int parameter)
         [GenericAttribute<DateTime?>]
         public event Action Event;
     }
-
-    public class CustomFieldInfo : FieldInfo
-    {
-        private readonly object[] _customAttributes;
-
-        public CustomFieldInfo(object[] customAttributes)
-        {
-            this._customAttributes = customAttributes;
-        }
-
-        public override FieldAttributes Attributes => default;
-        public override RuntimeFieldHandle FieldHandle => default;
-        public override Type FieldType => typeof(object);
-        public override Type DeclaringType => null;
-        public override string Name => "custom";
-        public override Type ReflectedType => null;
-
-        public override object[] GetCustomAttributes(bool inherit) => this._customAttributes;
-
-        public override object[] GetCustomAttributes(Type attributeType, bool inherit) => this._customAttributes;
-
-        public override object GetValue(object obj) => null;
-
-        public override bool IsDefined(Type attributeType, bool inherit) => false;
-
-        public override void SetValue(object obj, object value, BindingFlags invokeAttr, Binder binder, System.Globalization.CultureInfo culture)
-        {
-        }
-    }
 }
diff --git a/src/tests/reflection/GenericAttribute/GenericAttributeTests.cs b/src/tests/reflection/GenericAttribute/GenericAttributeTests.cs
index 01d81cc7ac1d0..b1dcd6bbbe397 100644
--- a/src/tests/reflection/GenericAttribute/GenericAttributeTests.cs
+++ b/src/tests/reflection/GenericAttribute/GenericAttributeTests.cs
@@ -22,6 +22,13 @@ static int Main(string[] args)
         Assert(!CustomAttributeExtensions.GetCustomAttributes(assembly, typeof(SingleAttribute<>)).GetEnumerator().MoveNext());
 */
 
+        // Module module = programTypeInfo.Module;
+        // AssertAny(CustomAttributeExtensions.GetCustomAttributes(module), a => a is SingleAttribute<long>);
+        // Assert(CustomAttributeExtensions.GetCustomAttributes(module, typeof(SingleAttribute<long>)).GetEnumerator().MoveNext());
+        // Assert(CustomAttributeExtensions.GetCustomAttributes(module, typeof(SingleAttribute<long>)).GetEnumerator().MoveNext());
+        // Assert(!CustomAttributeExtensions.GetCustomAttributes(module, typeof(SingleAttribute<>)).GetEnumerator().MoveNext());
+        // Assert(!CustomAttributeExtensions.GetCustomAttributes(module, typeof(SingleAttribute<>)).GetEnumerator().MoveNext());	
+
         TypeInfo programTypeInfo = typeof(Class).GetTypeInfo();
         Assert(CustomAttributeExtensions.GetCustomAttribute<SingleAttribute<int>>(programTypeInfo) != null);
         Assert(((ICustomAttributeProvider)programTypeInfo).GetCustomAttributes(typeof(SingleAttribute<int>), true) != null);
@@ -157,13 +164,6 @@ static int Main(string[] args)
         Assert(!CustomAttributeExtensions.GetCustomAttributes(programTypeInfo, typeof(MultiAttribute<>), true).GetEnumerator().MoveNext());
         Assert(!((ICustomAttributeProvider)programTypeInfo).GetCustomAttributes(typeof(MultiAttribute<>), true).GetEnumerator().MoveNext());
 
-        Module module = programTypeInfo.Module;
-        AssertAny(CustomAttributeExtensions.GetCustomAttributes(module), a => a is SingleAttribute<long>);
-        Assert(CustomAttributeExtensions.GetCustomAttributes(module, typeof(SingleAttribute<long>)).GetEnumerator().MoveNext());
-        Assert(CustomAttributeExtensions.GetCustomAttributes(module, typeof(SingleAttribute<long>)).GetEnumerator().MoveNext());
-        Assert(!CustomAttributeExtensions.GetCustomAttributes(module, typeof(SingleAttribute<>)).GetEnumerator().MoveNext());
-        Assert(!CustomAttributeExtensions.GetCustomAttributes(module, typeof(SingleAttribute<>)).GetEnumerator().MoveNext());	
-
         // Test coverage for CustomAttributeData api surface
         var a1_data = CustomAttributeData.GetCustomAttributes(programTypeInfo);
         AssertAny(a1_data, a => a.AttributeType == typeof(SingleAttribute<int>));