Unskip test and add test for invocation inside tuple expression.

src/EditorFeatures/CSharpTest/Completion/CompletionProviders/DeclarationNameCompletionProviderTests.cs

@@ -787,7 +787,7 @@ void M((int, System.Array $$),int)
         }
 
         [WorkItem(22342, "https://github.com/dotnet/roslyn/issues/22342")]
-        [Fact(Skip = "Not yet supported"), Trait(Traits.Feature, Traits.Features.Completion)]
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
         public async void TupleElementTypeInference()
         {
             var markup = @"
@@ -799,7 +799,11 @@ void Do()
     }
 }
 ";
-            await VerifyItemExistsAsync(markup, "action");
+            // Currently not supported:
+            await VerifyItemIsAbsentAsync(markup, "action");
+            // see https://github.com/dotnet/roslyn/issues/27138
+            // after the issue ist fixed we expect this to work:
+            // await VerifyItemExistsAsync(markup, "action");
         }
 
         [WorkItem(22342, "https://github.com/dotnet/roslyn/issues/22342")]
@@ -818,6 +822,23 @@ void Do()
             await VerifyItemExistsAsync(markup, "action");
         }
 
+        [WorkItem(22342, "https://github.com/dotnet/roslyn/issues/22342")]
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+        public async void TupleElementInvocationInsideTuple()
+        {
+            var markup = @"
+class Test
+{
+    void Do()
+    {
+            int M(int i1, int i2) => i1;
+            var t=(e1: 1, e2: M(1, $$));
+    }
+}
+";
+            await VerifyNoItemsExistAsync(markup);
+        }
+
         [WorkItem(17987, "https://github.com/dotnet/roslyn/issues/17987")]
         [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
         public async void Pluralize1()