[Hosts] Add UITest Cases for Hosts Module (#37600)

* Add UI-Tests for Host Module

src/common/UITestAutomation/Element/Element.cs

@@ -16,7 +16,7 @@ namespace Microsoft.PowerToys.UITest
     /// <summary>
     /// Represents a basic UI element in the application.
     /// </summary>
-    public class Element
+    public abstract class Element
     {
         private WindowsElement? windowsElement;
 

src/modules/Hosts/Hosts.UITests/HostModuleTests.cs

@@ -0,0 +1,108 @@
+// 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.Threading.Tasks;
+using Microsoft.PowerToys.UITest;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Hosts.UITests
+{
+    [TestClass]
+    public class HostModuleTests : UITestBase
+    {
+        public HostModuleTests()
+            : base(PowerToysModule.Hosts)
+        {
+        }
+
+        /// <summary>
+        /// Test if Empty-view is shown when no entries are present.
+        /// And 'Add an entry' button from Empty-view is functional.
+        /// </summary>
+        [TestMethod]
+        public void TestEmptyView()
+        {
+            this.CloseWarningDialog();
+            this.RemoveAllEntries();
+
+            // 'Add an entry' button (only show-up when list is empty) should be visible
+            Assert.IsTrue(this.FindAll<Button>(By.Name("Add an entry")).Count == 1, "'Add an entry' button should be visible in the empty view");
+
+            // Click 'Add an entry' from empty-view for adding Host override rule
+            this.Find<Button>(By.Name("Add an entry")).Click();
+
+            this.AddEntry("192.168.0.1", "localhost", false, false);
+
+            // Should have one row now and not more empty view
+            Assert.IsTrue(this.FindAll<Button>(By.Name("Delete")).Count == 1, "Should have one row now");
+            Assert.IsTrue(this.FindAll<Button>(By.Name("Add an entry")).Count == 0, "'Add an entry' button should be invisible if not empty view");
+        }
+
+        /// <summary>
+        /// Test if 'New entry' button is functional
+        /// </summary>
+        [TestMethod]
+        public void TestAddingEntry()
+        {
+            this.CloseWarningDialog();
+            this.RemoveAllEntries();
+
+            Assert.IsTrue(this.FindAll<Button>(By.Name("Delete")).Count == 0, "Should have no row after removing all");
+
+            this.AddEntry("192.168.0.1", "localhost", true);
+
+            Assert.IsTrue(this.FindAll<Button>(By.Name("Delete")).Count == 1, "Should have one row now");
+        }
+
+        private void AddEntry(string ip, string host, bool active = true, bool clickAddEntryButton = true)
+        {
+            if (clickAddEntryButton)
+            {
+                // Click 'Add an entry' for adding Host override rule
+                this.Find<Button>(By.Name("New entry")).Click();
+            }
+
+            // Adding a new host override localhost -> 192.168.0.1
+            Assert.IsFalse(this.Find<Button>(By.Name("Add")).Enabled, "Add button should be Disabled by default");
+
+            Assert.IsTrue(this.Find<TextBox>(By.Name("Address")).SetText(ip, false).Text == ip);
+            Assert.IsTrue(this.Find<TextBox>(By.Name("Hosts")).SetText(host, false).Text == host);
+
+            this.Find<ToggleSwitch>(By.Name("Active")).Toggle(active);
+
+            Assert.IsTrue(this.Find<Button>(By.Name("Add")).Enabled, "Add button should be Enabled after providing valid inputs");
+
+            // Add the entry
+            this.Find<Button>(By.Name("Add")).Click();
+
+            // 0.5 second delay after adding an entry
+            Task.Delay(500).Wait();
+        }
+
+        private void CloseWarningDialog()
+        {
+            // Find 'Accept' button which come in 'Warning' dialog
+            if (this.FindAll<Window>(By.Name("Warning")).Count > 0 &&
+                this.FindAll<Button>(By.Name("Accept")).Count > 0)
+            {
+                // Hide Warning dialog if any
+                this.Find<Button>(By.Name("Accept")).Click();
+            }
+        }
+
+        private void RemoveAllEntries()
+        {
+            // Delete all existing host-override rules
+            foreach (var deleteBtn in this.FindAll<Button>(By.Name("Delete")))
+            {
+                deleteBtn.Click();
+                this.Find<Button>(By.Name("Yes")).Click();
+            }
+
+            // Should have no row left, and no more delete button
+            Assert.IsTrue(this.FindAll<Button>(By.Name("Delete")).Count == 0);
+        }
+    }
+}

src/modules/Hosts/Hosts.UITests/Hosts.UITests.csproj

@@ -0,0 +1,25 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <!-- Look at Directory.Build.props in root for common stuff as well -->
+  <Import Project="..\..\..\Common.Dotnet.CsWinRT.props" />
+
+  <PropertyGroup>
+    <ProjectGuid>{4E0AE3A4-2EE0-44D7-A2D0-8769977254A0}</ProjectGuid>
+      <RootNamespace>PowerToys.Hosts.UITests</RootNamespace>
+      <AssemblyName>PowerToys.Hosts.UITests</AssemblyName>
+      <IsPackable>false</IsPackable>
+      <IsTestProject>true</IsTestProject>
+      <Nullable>enable</Nullable>
+      <OutputType>Library</OutputType>
+
+      <!-- This is a UI test, so don't run as part of MSBuild -->
+      <RunVSTest>false</RunVSTest>
+    </PropertyGroup>
+    <PropertyGroup>
+      <OutputPath>$(SolutionDir)$(Platform)\$(Configuration)\tests\Hosts.UITests\</OutputPath>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="MSTest" />
+      <ProjectReference Include="..\..\..\common\UITestAutomation\UITestAutomation.csproj" />
+    </ItemGroup>
+</Project>