[CmdPal][UI Tests] Add some indexer extension's test cases (#40731)

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fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
1. Add some test cases to cover indexer extension's ability.
2. Add CommandPaletteTestBase class to make us can easily implement test
case.

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## PR Checklist

- [x] **Closes:** #40732
- [x] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
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Co-authored-by: Yu Leng (from Dev Box) <yuleng@microsoft.com>

src/modules/cmdpal/Microsoft.CmdPal.UITests/BasicTests.cs

@@ -10,33 +10,12 @@ using Microsoft.VisualStudio.TestTools.UnitTesting;
 namespace Microsoft.CmdPal.UITests;
 
 [TestClass]
-public class BasicTests : UITestBase
+public class BasicTests : CommandPaletteTestBase
 {
     public BasicTests()
-        : base(PowerToysModule.CommandPalette)
     {
     }
 
-    private void SetSearchBox(string text)
-    {
-        Assert.AreEqual(this.Find<TextBox>("Type here to search...").SetText(text, true).Text, text);
-    }
-
-    private void SetFilesExtensionSearchBox(string text)
-    {
-        Assert.AreEqual(this.Find<TextBox>("Search for files and folders...").SetText(text, true).Text, text);
-    }
-
-    private void SetCalculatorExtensionSearchBox(string text)
-    {
-        Assert.AreEqual(this.Find<TextBox>("Type an equation...").SetText(text, true).Text, text);
-    }
-
-    private void SetTimeAndDaterExtensionSearchBox(string text)
-    {
-        Assert.AreEqual(this.Find<TextBox>("Search values or type a custom time stamp...").SetText(text, true).Text, text);
-    }
-
     [TestMethod]
     public void BasicFileSearchTest()
     {

src/modules/cmdpal/Microsoft.CmdPal.UITests/CommandPaletteTestBase.cs

@@ -0,0 +1,48 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.PowerToys.UITest;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Microsoft.CmdPal.UITests;
+
+public class CommandPaletteTestBase : UITestBase
+{
+    public CommandPaletteTestBase()
+        : base(PowerToysModule.CommandPalette)
+    {
+    }
+
+    protected void SetSearchBox(string text)
+    {
+        Assert.AreEqual(this.Find<TextBox>("Type here to search...").SetText(text, true).Text, text);
+    }
+
+    protected void SetFilesExtensionSearchBox(string text)
+    {
+        Assert.AreEqual(this.Find<TextBox>("Search for files and folders...").SetText(text, true).Text, text);
+    }
+
+    protected void SetCalculatorExtensionSearchBox(string text)
+    {
+        Assert.AreEqual(this.Find<TextBox>("Type an equation...").SetText(text, true).Text, text);
+    }
+
+    protected void SetTimeAndDaterExtensionSearchBox(string text)
+    {
+        Assert.AreEqual(this.Find<TextBox>("Search values or type a custom time stamp...").SetText(text, true).Text, text);
+    }
+
+    protected void OpenContextMenu()
+    {
+        var contextMenuButton = this.Find<Button>("More");
+        Assert.IsNotNull(contextMenuButton, "Context menu button not found.");
+        contextMenuButton.Click();
+    }
+}

src/modules/cmdpal/Microsoft.CmdPal.UITests/IndexerTests.cs

@@ -0,0 +1,226 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+using Microsoft.PowerToys.UITest;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Microsoft.CmdPal.UITests;
+
+[TestClass]
+public class IndexerTests : CommandPaletteTestBase
+{
+    private const string TestFileContent = "This is Indexer UI test sample";
+    private const string TestFileName = "indexer_test_item.txt";
+    private const string TestFolderName = "Downloads";
+
+    public IndexerTests()
+        : base()
+    {
+        // create a empty file in Downloads folder
+        // to ensure that the indexer has something to search for
+        var downloadsPath = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + "\\Downloads";
+        var emptyFilePath = System.IO.Path.Combine(downloadsPath, TestFileName);
+        if (!System.IO.File.Exists(emptyFilePath))
+        {
+            using (var fileStream = System.IO.File.Create(emptyFilePath))
+            {
+                var content = TestFileContent;
+                var contentBytes = Encoding.UTF8.GetBytes(content);
+                fileStream.Write(contentBytes, 0, contentBytes.Length);
+            }
+        }
+    }
+
+    public void EnterIndexerExtension()
+    {
+        SetSearchBox("files");
+
+        var searchFileItem = this.Find<NavigationViewItem>("Search files");
+        Assert.AreEqual(searchFileItem.Name, "Search files");
+        searchFileItem.DoubleClick();
+    }
+
+    [TestMethod]
+    public void BasicIndexerSearchTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox("Downloads");
+        Assert.IsNotNull(this.Find<NavigationViewItem>("Downloads"));
+    }
+
+    [TestMethod]
+    public void IndexerOpenFileTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox(TestFileName);
+
+        var searchItem = this.Find<NavigationViewItem>(TestFileName);
+
+        Assert.IsNotNull(searchItem);
+
+        searchItem.Click();
+
+        var openButton = this.Find<Button>("Open");
+        Assert.IsNotNull(openButton);
+
+        openButton.Click();
+        var notepadWindow = this.Find<Window>($"{TestFileName} - Notepad", global: true);
+
+        Assert.IsNotNull(notepadWindow);
+    }
+
+    [TestMethod]
+    public void IndexerDoubleClickOpenFileTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox(TestFileName);
+
+        var searchItem = this.Find<NavigationViewItem>(TestFileName);
+
+        Assert.IsNotNull(searchItem);
+
+        searchItem.DoubleClick();
+
+        var notepadWindow = this.Find<Window>($"{TestFileName} - Notepad", global: true);
+
+        Assert.IsNotNull(notepadWindow);
+    }
+
+    [TestMethod]
+    public void IndexerOpenFolderTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox(TestFolderName);
+
+        var searchItem = this.Find<NavigationViewItem>(TestFolderName);
+        Assert.IsNotNull(searchItem);
+        searchItem.Click();
+
+        var openButton = this.Find<Button>("Open");
+        Assert.IsNotNull(openButton);
+
+        openButton.Click();
+        var notepadWindow = this.Find<Window>($"{TestFolderName} - File Explorer", global: true);
+
+        Assert.IsNotNull(notepadWindow);
+    }
+
+    [TestMethod]
+    public void IndexerDoubleClickOpenFolderTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox(TestFolderName);
+
+        var searchItem = this.Find<NavigationViewItem>(TestFolderName);
+        Assert.IsNotNull(searchItem);
+        searchItem.DoubleClick();
+
+        var fileExplorer = this.Find<Window>($"{TestFolderName} - File Explorer", global: true);
+
+        Assert.IsNotNull(fileExplorer);
+    }
+
+    [TestMethod]
+    public void IndexerBrowseFolderTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox(TestFolderName);
+
+        var searchItem = this.Find<NavigationViewItem>(TestFolderName);
+        Assert.IsNotNull(searchItem);
+        searchItem.Click();
+
+        var openButton = this.Find<Button>("Browse");
+        Assert.IsNotNull(openButton);
+
+        openButton.Click();
+
+        var testItem = this.Find<NavigationViewItem>(TestFileName);
+        Assert.IsNotNull(testItem);
+    }
+
+    [STATestMethod]
+    [TestMethod]
+    public void IndexerCopyPathTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox(TestFileName);
+
+        var searchItem = this.Find<NavigationViewItem>(TestFileName);
+        Assert.IsNotNull(searchItem);
+        searchItem.Click();
+
+        OpenContextMenu();
+        var copyPathButton = this.Find<NavigationViewItem>("Copy path");
+        Assert.IsNotNull(copyPathButton);
+        copyPathButton.Click();
+
+        var clipboardContent = System.Windows.Forms.Clipboard.GetText();
+        Assert.IsTrue(clipboardContent.Contains(TestFileName), $"Clipboard content does not contain the expected file name. clipboard: {clipboardContent}");
+    }
+
+    [TestMethod]
+    public void IndexerShowInFolderTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox(TestFileName);
+
+        var searchItem = this.Find<NavigationViewItem>(TestFileName);
+        Assert.IsNotNull(searchItem);
+        searchItem.Click();
+
+        OpenContextMenu();
+        var showInFolderButton = this.Find<NavigationViewItem>("Show in folder");
+        Assert.IsNotNull(showInFolderButton);
+        showInFolderButton.Click();
+
+        var fileExplorer = this.Find<Window>($"{TestFolderName} - File Explorer", global: true, timeoutMS: 20000);
+
+        Assert.IsNotNull(fileExplorer);
+    }
+
+    [TestMethod]
+    public void IndexerOpenPathInConsoleTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox(TestFileName);
+
+        var searchItem = this.Find<NavigationViewItem>(TestFileName);
+        Assert.IsNotNull(searchItem);
+        searchItem.Click();
+
+        OpenContextMenu();
+        var copyPathButton = this.Find<NavigationViewItem>("Open path in console");
+        Assert.IsNotNull(copyPathButton);
+        copyPathButton.Click();
+
+        var textItem = this.Find<Window>("C:\\Windows\\system32\\cmd.exe", global: true);
+        Assert.IsNotNull(textItem, "The console did not open with the expected path.");
+    }
+
+    [TestMethod]
+    public void IndexerOpenPropertiesTest()
+    {
+        EnterIndexerExtension();
+        SetFilesExtensionSearchBox(TestFileName);
+
+        var searchItem = this.Find<NavigationViewItem>(TestFileName);
+        Assert.IsNotNull(searchItem);
+        searchItem.Click();
+
+        OpenContextMenu();
+        var copyPathButton = this.Find<NavigationViewItem>("Properties");
+        Assert.IsNotNull(copyPathButton);
+        copyPathButton.Click();
+
+        var propertiesWindow = this.Find<Window>($"{TestFileName} Properties", global: true);
+        Assert.IsNotNull(propertiesWindow, "The properties window did not open for the selected file.");
+    }
+}