Add IReturnStatement tests for C#

src/Compilers/CSharp/Test/Semantic/CSharpCompilerSemanticTest.csproj

@@ -67,6 +67,7 @@
     <Compile Include="IOperation\IOperationTests_IFieldReferenceExpression.cs" />
     <Compile Include="IOperation\IOperationTests_IObjectCreationExpression.cs" />
     <Compile Include="IOperation\IOperationTests_IParameterReferenceExpression.cs" />
+    <Compile Include="IOperation\IOperationTests_IReturnStatement.cs" />
     <Compile Include="IOperation\IOperationTests_ISymbolInitializer.cs" />
     <Compile Include="IOperation\IOperationTests_InvalidExpression.cs" />
     <Compile Include="IOperation\IOperationTests_InvalidStatement.cs" />

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IReturnStatement.cs

+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using System.Diagnostics;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Semantics;
+using Microsoft.CodeAnalysis.Test.Utilities;
+using Roslyn.Test.Utilities;
+using Xunit;
+
+namespace Microsoft.CodeAnalysis.CSharp.UnitTests
+{
+    public partial class IOperationTests : SemanticModelTestBase
+    {
+        [Fact]
+        public void SimpleReturnFromRegularMethod()
+        {
+            string source = @"
+class C
+{
+    static void Method()
+    {
+        /*<bind>*/return;/*</bind>*/
+    }
+}
+";
+            string expectedOperationTree = @"IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'return;')
+";
+            var expectedDiagnostics = DiagnosticDescription.None;
+            VerifyOperationTreeAndDiagnosticsForTest<ReturnStatementSyntax>(source, expectedOperationTree, expectedDiagnostics);
+        }
+
+        [Fact]
+        public void ReturnWithValueFromRegularMethod()
+        {
+            string source = @"
+class C
+{
+    static bool Method()
+    {
+        /*<bind>*/return true;/*</bind>*/
+    }
+}
+";
+            string expectedOperationTree = @"IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'return true;')
+  ILiteralExpression (OperationKind.LiteralExpression, Type: System.Boolean, Constant: True) (Syntax: 'true')
+";
+            var expectedDiagnostics = DiagnosticDescription.None;
+
+            VerifyOperationTreeAndDiagnosticsForTest<ReturnStatementSyntax>(source, expectedOperationTree, expectedDiagnostics);
+        }
+
+        [Fact]
+        public void YieldReturnFromRegularMethod()
+        {
+            string source = @"
+using System.Collections.Generic;
+class C
+{
+    static IEnumerable<int> Method()
+    {
+        /*<bind>*/yield return 0;/*</bind>*/
+    }
+}
+";
+            string expectedOperationTree = @"IReturnStatement (OperationKind.YieldReturnStatement) (Syntax: 'yield return 0;')
+  ILiteralExpression (Text: 0) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 0) (Syntax: '0')";
+            var expectedDiagnostics = DiagnosticDescription.None;
+
+            VerifyOperationTreeAndDiagnosticsForTest<YieldStatementSyntax>(source, expectedOperationTree, expectedDiagnostics);
+        }
+
+        [Fact]
+        public void YieldBreakFromRegularMethod()
+        {
+            string source = @"
+using System.Collections.Generic;
+class C
+{
+    static IEnumerable<int> Method()
+    {
+        yield return 0;
+        /*<bind>*/yield break;/*</bind>*/
+    }
+}
+";
+            string expectedOperationTree = @"IReturnStatement (OperationKind.YieldBreakStatement) (Syntax: 'yield break;')";
+            var expectedDiagnostics = DiagnosticDescription.None;
+
+            VerifyOperationTreeAndDiagnosticsForTest<YieldStatementSyntax>(source, expectedOperationTree, expectedDiagnostics);
+        }
+    }
+}
\ No newline at end of file

src/Test/Utilities/Portable/Compilation/OperationTreeVerifier.cs

@@ -420,7 +420,7 @@ public override void VisitBranchStatement(IBranchStatement operation)
 
         public override void VisitYieldBreakStatement(IReturnStatement operation)
         {
-            LogString("YieldBreakStatement");
+            LogString(nameof(IReturnStatement));
             LogCommonPropertiesAndNewLine(operation);
 
             base.VisitYieldBreakStatement(operation);