Add integration tests for F1 help (#18406)

Add integration tests for F1 help

src/VisualStudio/IntegrationTest/IntegrationTests/CSharp/CSharpF1Help.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 Microsoft.CodeAnalysis;
+using Microsoft.VisualStudio.IntegrationTest.Utilities;
+using Roslyn.Test.Utilities;
+using Xunit;
+
+namespace Roslyn.VisualStudio.IntegrationTests.CSharp
+{
+    [Collection(nameof(SharedIntegrationHostFixture))]
+    public class CSharpF1Help : AbstractEditorTest
+    {
+        protected override string LanguageName => LanguageNames.CSharp;
+
+        public CSharpF1Help(VisualStudioInstanceFactory instanceFactory)
+            : base(instanceFactory, nameof(CSharpF1Help))
+        {
+        }
+
+        [Fact, Trait(Traits.Feature, Traits.Features.F1Help)]
+        void F1Help()
+        {
+            var text = @"
+using System;
+using System.IO;
+using System.Linq;
+using System.Collections.Generic;
+
+namespace F1TestNamespace
+{
+    #region TaoRegion
+    abstract class ShapesClass { }
+
+    class Program$$
+    {
+        public static void Main()
+        {
+        }
+
+        public IEnumerable<int> Linq1()
+        {
+            int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };
+            int i = numbers.First();
+            int j = Array.IndexOf(numbers, 1);
+
+            var lowNums1 =
+                from n in numbers
+                orderby n ascending
+                where n < 5
+                select n;
+
+            var numberGroups =
+              from n in numbers
+              let m = 1
+              join p in numbers on i equals p
+              group n by n % 5 into g
+              select new { Remainder = g.Key, Numbers = g };
+
+            foreach (int element in numbers) yield return i;
+        }
+
+    }
+    #endregion TaoRegion
+}";
+
+            SetUpEditor(text);
+            Verify("abstract", "abstract_CSharpKeyword");
+            Verify("ascending", "ascending_CSharpKeyword");
+            Verify("from", "from_CSharpKeyword");
+            Verify("First();", "System.Linq.Enumerable.First``1");
+        }
+
+        private void Verify(string word, string expectedKeyword)
+        {
+            VisualStudio.Editor.PlaceCaret(word, charsOffset: -1);
+            Assert.Contains(expectedKeyword, VisualStudio.Editor.GetF1Keyword());
+        }
+    }
+}
\ No newline at end of file

src/VisualStudio/IntegrationTest/IntegrationTests/VisualBasic/BasicF1Help.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 Microsoft.CodeAnalysis;
+using Microsoft.VisualStudio.IntegrationTest.Utilities;
+using Roslyn.Test.Utilities;
+using Xunit;
+
+namespace Roslyn.VisualStudio.IntegrationTests.Basic
+{
+    [Collection(nameof(SharedIntegrationHostFixture))]
+    public class BasicF1Help : AbstractEditorTest
+    {
+        protected override string LanguageName => LanguageNames.VisualBasic;
+
+        public BasicF1Help(VisualStudioInstanceFactory instanceFactory)
+            : base(instanceFactory, nameof(BasicF1Help))
+        {
+        }
+
+        [Fact, Trait(Traits.Feature, Traits.Features.F1Help)]
+        void F1Help()
+        {
+            var text = @"
+Imports System
+Imports System.Collections.Generic
+Imports System.Linq
+
+Module Program$$
+    Sub Main(args As String())
+        Dim query = From arg In args
+                    Select args.Any(Function(a) a.Length > 5)
+        Dim x = 0
+        x += 1
+    End Sub
+    Public Function F() As Object
+        Return Nothing
+    End Function
+End Module";
+
+            SetUpEditor(text);
+            Verify("Linq", "System.Linq");
+            Verify("String", "vb.String");
+            Verify("Any", "System.Linq.Enumerable.Any");
+            Verify("From", "vb.QueryFrom");
+            Verify("+=", "vb.+=");
+            Verify("Nothing", "vb.Nothing");
+
+        }
+
+        private void Verify(string word, string expectedKeyword)
+        {
+            VisualStudio.Editor.PlaceCaret(word, charsOffset: -1);
+            Assert.Contains(expectedKeyword, VisualStudio.Editor.GetF1Keyword());
+        }
+    }
+}
\ No newline at end of file

src/VisualStudio/IntegrationTest/IntegrationTests/VisualStudioIntegrationTests.csproj

@@ -22,6 +22,7 @@
     <Compile Include="AbstractIntegrationTest.cs" />
     <Compile Include="AbstractInteractiveWindowTest.cs" />
     <Compile Include="CSharp\CSharpEncapsulateField.cs" />
+    <Compile Include="CSharp\CSharpF1Help.cs" />
     <Compile Include="CSharp\CSharpInteractiveBoxSelection.cs" />
     <Compile Include="CSharp\CSharpChangeSignatureDialog.cs" />
     <Compile Include="CSharp\CSharpClassification.cs" />
@@ -59,6 +60,7 @@
     <Compile Include="VisualBasic\BasicEncapsulateField.cs" />
     <Compile Include="VisualBasic\BasicNavigationBar.cs" />
     <Compile Include="VisualBasic\BasicLineCommit.cs" />
+    <Compile Include="VisualBasic\BasicF1Help.cs" />
     <Compile Include="VisualBasic\BasicSquigglesCommon.cs" />
     <Compile Include="VisualBasic\BasicSquigglesDesktop.cs" />
     <Compile Include="VisualBasic\BasicSquigglesNetCore.cs" />

src/VisualStudio/IntegrationTest/TestUtilities/InProcess/Editor_InProc.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.ComponentModel;
 using System.ComponentModel.Design;
 using System.Linq;
@@ -12,6 +13,7 @@
 using Microsoft.CodeAnalysis.Editor.Shared.Extensions;
 using Microsoft.VisualStudio.IntegrationTest.Utilities.Common;
 using Microsoft.VisualStudio.Language.Intellisense;
+using Microsoft.VisualStudio.Shell.Interop;
 using Microsoft.VisualStudio.Text;
 using Microsoft.VisualStudio.Text.Editor;
 using Microsoft.VisualStudio.Text.Tagging;
@@ -499,5 +501,38 @@ protected override ITextBuffer GetBufferContainingCaret(IWpfTextView view)
         {
             return view.GetBufferContainingCaret();
         }
+
+        public List<string> GetF1Keywords()
+        {
+            return InvokeOnUIThread(() =>
+            {
+                var results = new List<string>();
+                GetActiveVsTextView().GetBuffer(out var textLines);
+                Marshal.ThrowExceptionForHR(textLines.GetLanguageServiceID(out var languageServiceGuid));
+                Marshal.ThrowExceptionForHR(Microsoft.VisualStudio.Shell.ServiceProvider.GlobalProvider.QueryService(languageServiceGuid, out var languageService));
+                var languageContextProvider = languageService as IVsLanguageContextProvider;
+
+                IVsMonitorUserContext monitorUserContext = GetGlobalService<SVsMonitorUserContext, IVsMonitorUserContext>();
+                Marshal.ThrowExceptionForHR(monitorUserContext.CreateEmptyContext(out var emptyUserContext));
+                Marshal.ThrowExceptionForHR(GetActiveVsTextView().GetCaretPos(out var line, out var column));
+                var span = new TextSpan()
+                {
+                    iStartLine = line,
+                    iStartIndex = column,
+                    iEndLine = line,
+                    iEndIndex = column
+                };
+                
+                Marshal.ThrowExceptionForHR(languageContextProvider.UpdateLanguageContext(0, textLines, new[] { span }, emptyUserContext));
+                Marshal.ThrowExceptionForHR(emptyUserContext.CountAttributes("keyword", VSConstants.S_FALSE, out var count));
+                for (int i = 0; i < count; i++)
+                {
+                    emptyUserContext.GetAttribute(i, "keyword", VSConstants.S_FALSE, out var key, out var value);
+                    results.Add(value);
+                }
+
+                return results;
+            });
+        }
     }
 }

src/VisualStudio/IntegrationTest/TestUtilities/OutOfProcess/Editor_OutOfProc.cs

@@ -3,11 +3,13 @@
 using System;
 using System.Linq;
 using System.Windows.Automation;
+using System.Collections.Generic;
 using Microsoft.CodeAnalysis.Shared.TestHooks;
 using Microsoft.CodeAnalysis.Text;
 using Microsoft.VisualStudio.IntegrationTest.Utilities.Common;
 using Microsoft.VisualStudio.IntegrationTest.Utilities.InProcess;
 using Microsoft.VisualStudio.IntegrationTest.Utilities.Input;
+using System.Collections.Immutable;
 
 namespace Microsoft.VisualStudio.IntegrationTest.Utilities.OutOfProcess
 {
@@ -173,6 +175,8 @@ public void WaitForActiveView(string viewName)
         public string[] GetErrorTags()
             => _editorInProc.GetErrorTags();
 
+        public List<string> GetF1Keyword()
+            => _editorInProc.GetF1Keywords();        
 
         public void ExpandProjectNavBar()
         {