Add tests.

src/EditorFeatures/CSharpTest/CSharpEditorServicesTest.csproj

@@ -281,6 +281,7 @@
     <Compile Include="Formatting\Indentation\SmartTokenFormatterFormatTokenTests.cs" />
     <Compile Include="InlineDeclaration\CSharpInlineDeclarationTests_FixAllTests.cs" />
     <Compile Include="InlineDeclaration\CSharpInlineDeclarationTests.cs" />
+    <Compile Include="Structure\ArrowExpressionClauseStructureTests.cs" />
     <Compile Include="Structure\InitializerExpressionStructureTests.cs" />
     <Compile Include="UseCollectionInitializer\UseCollectionInitializerTests.cs" />
     <Compile Include="UseCoalesceExpression\UseCoalesceExpressionForNullableTests.cs" />

src/EditorFeatures/CSharpTest/Structure/ArrowExpressionClauseStructureTests.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.Threading.Tasks;
+using Microsoft.CodeAnalysis.CSharp.Structure;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Structure;
+using Roslyn.Test.Utilities;
+using Xunit;
+
+namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Structure
+{
+    public class ArrowExpressionClauseStructureTests : AbstractCSharpSyntaxNodeStructureTests<ArrowExpressionClauseSyntax>
+    {
+        internal override AbstractSyntaxStructureProvider CreateProvider()
+            => new ArrowExpressionClauseStructureProvider();
+
+        [Fact, Trait(Traits.Feature, Traits.Features.Outlining)]
+        public async Task TestArrowExpressionClause1()
+        {
+            await VerifyBlockSpansAsync(
+@"
+class C
+{
+    {|hintspan:void M(){|textspan: $$=> expression
+        ? trueCase
+        : falseCase;|}|};
+}
+",
+                Region("textspan", "hintspan", CSharpStructureHelpers.Ellipsis, autoCollapse: false));
+        }
+    }
+}
\ No newline at end of file

src/Features/CSharp/Portable/Structure/Providers/ArrowExpressionClauseStructureProvider.cs

@@ -19,7 +19,7 @@ internal class ArrowExpressionClauseStructureProvider : AbstractSyntaxNodeStruct
             var previousToken = node.ArrowToken.GetPreviousToken();
             spans.Add(new BlockSpan(
                 isCollapsible: true,
-                textSpan: TextSpan.FromBounds(previousToken.Span.End, node.Span.End),
+                textSpan: TextSpan.FromBounds(previousToken.Span.End, node.Parent.Span.End),
                 hintSpan: node.Parent.Span,
                 type: BlockTypes.Nonstructural));
         }