Add a timebox test

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

@@ -1253,6 +1253,32 @@ namespace Foo
             await VerifyCustomCommitProviderAsync(markup, "MyClass", expectedCodeAfterCommit, sourceCodeKind: kind);
         }
 
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+        [WorkItem(36624, "https://github.com/dotnet/roslyn/issues/36624")]
+        public async Task DoNotShowImportItemsIfTimeout()
+        {
+            // Set timeout to 0 so it always timeout
+            AbstractTypeImportCompletionProvider.TimeoutInMilliseconds = 0;
+
+            var file1 = $@"
+namespace NS1
+{{
+    public class Bar
+    {{}}
+}}";
+            var file2 = @"
+namespace NS2
+{
+    class C
+    {
+         $$
+    }
+}";
+
+            var markup = CreateMarkupForSingleProject(file2, file1, LanguageNames.CSharp);
+            await VerifyTypeImportItemIsAbsentAsync(markup, "Bar", inlineDescription: "NS1");
+        }
+
         private static void AssertRelativeOrder(List<string> expectedTypesInRelativeOrder, ImmutableArray<CompletionItem> allCompletionItems)
         {
             var hashset = new HashSet<string>(expectedTypesInRelativeOrder);