Add test.

src/EditorFeatures/CSharpTest/Wrapping/CallWrappingTests.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;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.CodeRefactorings;
 using Microsoft.CodeAnalysis.Editor.CSharp.Wrapping;
@@ -111,6 +107,23 @@ public async Task TestWrapAndUnwrap()
     void Bar() {
         the.quick.brown[1, 2, 3].fox.jumped[1][2][3];
     }
+}");
+        }
+
+        [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsWrapping)]
+        public async Task TestChunkMustHaveDottedSection()
+        {
+            await TestAllWrappingCasesAsync(
+@"class C {
+    void Bar() {
+        [||]the().quick.brown[1, 2, 3].fox.jumped[1][2][3];
+    }
+}",
+@"class C {
+    void Bar() {
+        the().quick.brown[1, 2, 3]
+             .fox.jumped[1][2][3];
+    }
 }");
         }
     }