update ut case

Author: v-fuquanli

mdoc/mdoc.Test/MDocUpdaterTests.cs

@@ -269,25 +269,35 @@ public void Test_RunWithRefStructValidation()
             updater.Run(args);
 
             // Assert
-            var iRefStructProcessorPath = Path.Combine(outputDir, "AllowsRefStructDemo", "IRefStructProcessor`1.xml");
+            var IRefStructProcessorPath = Path.Combine(outputDir, "AllowsRefStructDemo", "IRefStructProcessor`1.xml");
             var refStructHandlerPath = Path.Combine(outputDir, "AllowsRefStructDemo", "RefStructHandler.xml");
+            var ImmutablePath = Path.Combine(outputDir, "AllowsRefStructDemo", "Immutable.xml");
 
-            Assert.IsTrue(File.Exists(iRefStructProcessorPath));
+            Assert.IsTrue(File.Exists(IRefStructProcessorPath));
             Assert.IsTrue(File.Exists(refStructHandlerPath));
 
-            var iRefStructProcessorDoc = new XmlDocument();
-            iRefStructProcessorDoc.Load(iRefStructProcessorPath);
-            var iRefStructProcessorNode = iRefStructProcessorDoc.SelectSingleNode("//TypeParameters/TypeParameter/Constraints/ParameterAttribute[text()='AllowByRefLike']");
-            Assert.IsNotNull(iRefStructProcessorNode, "Missing <ParameterAttribute>AllowByRefLike</ParameterAttribute> in IRefStructProcessor`1.xml");
-            var iRefStructProcessorTypeSignatureNode = iRefStructProcessorDoc.SelectSingleNode("//TypeSignature[@Language='C#' and contains(@Value, 'where T : allows ref struct')]");
-            Assert.IsNotNull(iRefStructProcessorTypeSignatureNode, "Missing TypeSignature with 'where T : allows ref struct' in IRefStructProcessor`1.xml");
+            var IRefStructProcessorDoc = new XmlDocument();
+            IRefStructProcessorDoc.Load(IRefStructProcessorPath);
+            var IRefStructProcessorNode = IRefStructProcessorDoc.SelectSingleNode("//TypeParameters/TypeParameter/Constraints/ParameterAttribute[text()='AllowByRefLike']");
+            Assert.IsNotNull(IRefStructProcessorNode, "Missing <ParameterAttribute>AllowByRefLike</ParameterAttribute> in IRefStructProcessor`1.xml");
+            var IRefStructProcessorTypeSignatureNode = IRefStructProcessorDoc.SelectSingleNode("//TypeSignature[@Language='C#' and contains(@Value, 'where T : allows ref struct')]");
+            Assert.IsNotNull(IRefStructProcessorTypeSignatureNode, "Missing TypeSignature with 'where T : allows ref struct' in IRefStructProcessor`1.xml");
 
             var refStructHandlerDoc = new XmlDocument();
             refStructHandlerDoc.Load(refStructHandlerPath);
             var refStructHandlerNode = refStructHandlerDoc.SelectSingleNode("//Members/Member/TypeParameters/TypeParameter/Constraints/ParameterAttribute[text()='AllowByRefLike']");
             Assert.IsNotNull(refStructHandlerNode, "Missing <ParameterAttribute>AllowByRefLike</ParameterAttribute> in RefStructHandler.xml");
             var refStructHandlerMemberSignatureNode = refStructHandlerDoc.SelectSingleNode("//Members/Member/MemberSignature[@Language='C#' and contains(@Value, 'where T : new(), allows ref struct')]");
             Assert.IsNotNull(refStructHandlerMemberSignatureNode, "Missing MemberSignature with 'where T : allows ref struct' in RefStructHandler.xml");
+
+            var ImmutableDoc = new XmlDocument();
+            ImmutableDoc.Load(ImmutablePath);
+            var constraintsNodes = ImmutableDoc.SelectNodes("//Members/Member/TypeParameters/TypeParameter/Constraints");
+            Assert.IsTrue(constraintsNodes.Count == 1, "Multiple <Constraints> in Immutable.xml");
+            var allowByRefLikeNode = ImmutableDoc.SelectSingleNode("//Members/Member/TypeParameters/TypeParameter/Constraints/ParameterAttribute[text()='AllowByRefLike']");
+            var defaultConstructorNode = ImmutableDoc.SelectSingleNode("//Members/Member/TypeParameters/TypeParameter/Constraints/ParameterAttribute[text()='DefaultConstructorConstraint']");
+            Assert.IsNotNull(allowByRefLikeNode, "Missing <ParameterAttribute>AllowByRefLike</ParameterAttribute> in Immutable.xml");
+            Assert.IsNotNull(defaultConstructorNode, "Missing <ParameterAttribute>DefaultConstructorConstraint</ParameterAttribute> in Immutable.xml");
         }
     }
 }