XmlSerializer test for DefaultValueAttributes

Author: matouskozak

tests/Mono.Android-Tests/System.Xml/XmlSerializer.cs

@@ -0,0 +1,23 @@
+using System.Xml.Serialization;
+using System.ComponentModel;
+
+using NUnit.Framework;
+
+namespace System.XmlTests {
+    public class C {
+        [DefaultValue(typeof(C), "c")]
+        public Type? T { get; }
+    }
+    
+    [TestFixture]
+    public class XmlSerializerTest {
+
+        [Test]
+        public void TrimmingDefaultValueAttribute ()
+        {
+            // Context: https://github.com/dotnet/runtime/issues/109724
+            var s = new XmlSerializer(typeof(C));
+            _ = new C().T; // Prevent C.T from being removed by trimming
+        }
+    }
+}