Add additional tests for completion in tuple declarations

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

@@ -8965,7 +8965,7 @@ public async Task TupleTypeAtMemberLevel3()
             await VerifyItemExistsAsync(@"
 class C
 {
-    (C, 
+    (C, $$
 }", "C");
         }
 
@@ -8979,5 +8979,48 @@ class C
     (C, $$)
 }", "C");
         }
+
+
+        [WorkItem(14127, "https://github.com/dotnet/roslyn/issues/14127")]
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+        public async Task TupleTypeInForeach()
+        {
+            await VerifyItemExistsAsync(@"
+class C
+{
+    void M()
+    {
+        foreach ((C, $$
+    }
+}", "C");
+        }
+
+
+        [WorkItem(14127, "https://github.com/dotnet/roslyn/issues/14127")]
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+        public async Task TupleTypeInParameterList()
+        {
+            await VerifyItemExistsAsync(@"
+class C
+{
+    void M((C, $$)
+    {
+    }
+}", "C");
+        }
+
+        [WorkItem(14127, "https://github.com/dotnet/roslyn/issues/14127")]
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+        public async Task TupleTypeInNameOf()
+        {
+            await VerifyItemExistsAsync(@"
+class C
+{
+    void M(($$)
+    {
+        var x = nameof((C, $$
+    }
+}", "C");
+        }
     }
 }
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