Adding UnitTests project with example tests for MockProvider

UnitTests/UnitTests.UWP/Package.appxmanifest

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+<?xml version="1.0" encoding="utf-8"?>
+<Package
+  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
+  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+  IgnorableNamespaces="uap mp">
+
+  <Identity Name="c089351a-4c91-4cb0-afa7-b976ac715456"
+            Publisher="CN=shweaver"
+            Version="1.0.0.0" />
+
+  <mp:PhoneIdentity PhoneProductId="c089351a-4c91-4cb0-afa7-b976ac715456" PhonePublisherId="00000000-0000-0000-0000-000000000000"/>
+
+  <Properties>
+    <DisplayName>UnitTests.UWP</DisplayName>
+    <PublisherDisplayName>WCT</PublisherDisplayName>
+    <Logo>Assets\StoreLogo.png</Logo>
+  </Properties>
+
+  <Dependencies>
+    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.0.0" MaxVersionTested="10.0.0.0" />
+  </Dependencies>
+
+  <Resources>
+    <Resource Language="x-generate" />
+  </Resources>
+  <Applications>
+    <Application Id="vstest.executionengine.universal.App"
+        Executable="$targetnametoken$.exe"
+        EntryPoint="UnitTests.UWP.App">
+      <uap:VisualElements
+        DisplayName="UnitTests.UWP"
+        Square150x150Logo="Assets\Square150x150Logo.png"
+        Square44x44Logo="Assets\Square44x44Logo.png"
+        Description="UnitTests.UWP"
+        BackgroundColor="transparent">
+        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png"/>
+        <uap:SplashScreen Image="Assets\SplashScreen.png" />
+      </uap:VisualElements>
+    </Application>
+  </Applications>
+  <Capabilities>
+    <Capability Name="internetClientServer" />
+    <Capability Name="privateNetworkClientServer" />
+  </Capabilities>
+</Package>

UnitTests/UnitTests.UWP/Properties/AssemblyInfo.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("UnitTests")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("UnitTests")]
+[assembly: AssemblyCopyright("Copyright ©  2021")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: AssemblyMetadata("TargetPlatform", "UAP")]
+
+[assembly: ComVisible(false)]

UnitTests/UnitTests.UWP/Properties/Default.rd.xml

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+<!--
+    This file contains Runtime Directives used by .NET Native. The defaults here are suitable for most
+    developers. However, you can modify these parameters to modify the behavior of the .NET Native
+    optimizer.
+
+    Runtime Directives are documented at https://go.microsoft.com/fwlink/?LinkID=391919
+
+    To fully enable reflection for App1.MyClass and all of its public/private members
+    <Type Name="App1.MyClass" Dynamic="Required All"/>
+
+    To enable dynamic creation of the specific instantiation of AppClass<T> over System.Int32
+    <TypeInstantiation Name="App1.AppClass" Arguments="System.Int32" Activate="Required Public" />
+
+    Using the Namespace directive to apply reflection policy to all the types in a particular namespace
+    <Namespace Name="DataClasses.ViewModels" Serialize="All" />
+-->
+
+<Directives xmlns="http://schemas.microsoft.com/netfx/2013/01/metadata">
+  <Application>
+    <!--
+      An Assembly element with Name="*Application*" applies to all assemblies in
+      the application package. The asterisks are not wildcards.
+    -->
+    <Assembly Name="*Application*" Dynamic="Required All" />
+    <!-- Add your application specific runtime directives here. -->
+
+
+  </Application>
+</Directives>

UnitTests/UnitTests.UWP/Providers/Test_MockProvider.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using CommunityToolkit.Net.Authentication;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace UnitTests.UWP.Authentication
+{
+    [TestClass]
+    public class Test_MockProvider
+    {
+        /// <summary>
+        /// Create a new instance of the MockProvider and check that is has the proper default state.
+        /// </summary>
+        [TestCategory("Providers")]
+        [TestMethod]
+        public void Test_MockProvider_Default()
+        {
+            IProvider provider = new MockProvider();
+
+            Assert.AreEqual(ProviderState.SignedIn, provider.State);
+        }
+
+        /// <summary>
+        /// Create a new instance of the MockProvider and initiates login.
+        /// The test checks that the appropriate events are fired and that the provider transitions 
+        /// through the different states as expected.
+        /// </summary>
+        [TestCategory("Providers")]
+        [TestMethod]
+        public async Task Test_MockProvider_LoginAsync()
+        {
+            // Create the new provider, pre-signed out.
+            IProvider provider = new MockProvider(false);
+
+            // The newly created provider should be in a logged out state.
+            Assert.AreEqual(ProviderState.SignedOut, provider.State);
+
+            // Listen for changes in the provider state and count them.
+            int eventCount = 0;
+            provider.StateChanged += (s, e) =>
+            {
+                eventCount += 1;
+
+                // Ensure that the states are properly reported through the StateChanged event.
+                switch (e.OldState)
+                {
+                    case ProviderState.SignedOut:
+                        // Login has been initiated, the provider should now be loading.
+                        Assert.AreEqual(ProviderState.Loading, e.NewState);
+
+                        // Loading should be the first event fired.
+                        Assert.AreEqual(eventCount, 1);
+                        break;
+
+                    case ProviderState.Loading:
+                        // The provider has completed login, the provider should now be signed in.
+                        Assert.AreEqual(ProviderState.SignedIn, e.NewState);
+
+                        // SignedIn should be the second event fired.
+                        Assert.AreEqual(eventCount, 2);
+                        break;
+
+                    default:
+                        // This is unexpected, something went wrong during the test.
+                        Assert.Fail("The provider has transitioned from an unexpected state: " + Enum.GetName(typeof(ProviderState), e.OldState));
+                        break;
+                }
+            };
+
+            // Initiate logout.
+            await provider.LoginAsync();
+
+            // Logout has completed, the provider should be signed out.
+            Assert.AreEqual(ProviderState.SignedIn, provider.State);
+
+            // Ensure the proper number of events were fired.
+            Assert.AreEqual(eventCount, 2);
+        }
+
+        /// <summary>
+        /// Create a new instance of the MockProvider and initiates logout.
+        /// The test checks that the appropriate events are fired and that the provider transitions 
+        /// through the different states as expected.
+        /// </summary>
+        [TestCategory("Providers")]
+        [TestMethod]
+        public async Task Test_MockProvider_LogoutAsync()
+        {
+            // Create the new provider, pre-signed in.
+            IProvider provider = new MockProvider(true);
+
+            // The newly created provider should be in a logged in state.
+            Assert.AreEqual(ProviderState.SignedIn, provider.State);
+
+            // Listen for changes in the provider state and count them.
+            int eventCount = 0;
+            provider.StateChanged += (s, e) =>
+            {
+                eventCount += 1;
+
+                // Ensure that the states are properly reported through the StateChanged event.
+                switch (e.OldState)
+                {
+                    case ProviderState.SignedIn:
+                        // Logout has been initiated, the provider should now be loading.
+                        Assert.AreEqual(ProviderState.Loading, e.NewState);
+
+                        // Loading should be the first event fired.
+                        Assert.AreEqual(eventCount, 1);
+                        break;
+
+                    case ProviderState.Loading:
+                        // The provider has completed logout, the provider should now be signed out.
+                        Assert.AreEqual(ProviderState.SignedOut, e.NewState);
+
+                        // SignedOut should be the second event fired.
+                        Assert.AreEqual(eventCount, 2);
+                        break;
+
+                    default:
+                        // This is unexpected, something went wrong during the test.
+                        Assert.Fail("The provider has transitioned from an unexpected state: " + Enum.GetName(typeof(ProviderState), e.OldState));
+                        break;
+                }
+            };
+
+            // Initiate logout.
+            await provider.LogoutAsync();
+
+            // Logout has completed, the provider should be signed out.
+            Assert.AreEqual(ProviderState.SignedOut, provider.State);
+
+            // Ensure the proper number of events were fired.
+            Assert.AreEqual(eventCount, 2);
+        }
+
+        /// <summary>
+        /// Authenticate an empty request and detect that the approapriate headers have been added.
+        /// </summary>
+        [TestCategory("Providers")]
+        [TestMethod]
+        public async Task Test_MockProvider_AuthenticateRequestAsync()
+        {
+            // Create a new instance of the MockProvider.
+            IProvider provider = new MockProvider(true);
+
+            // Create an empty message to authenticate.
+            var message = new HttpRequestMessage(HttpMethod.Get, new Uri("https://graph.microsoft.com/v1/me"));
+
+            // Use the provider to authenticate the message.
+            await provider.AuthenticateRequestAsync(message);
+
+            // Check for the absence of the SdkVersion header value on the empty message.
+            bool sdkVersionHeaderExists = message.Headers.TryGetValues("SdkVersion", out _);
+            Assert.IsFalse(sdkVersionHeaderExists, "SdkVersion header values should not exist on an empty request that does not originate from the SDK.");
+
+            // Check for the authorization header
+            Assert.IsNotNull(message.Headers.Authorization, "Authorization header was not found.");
+            Assert.AreEqual("Bearer", message.Headers.Authorization.Scheme);
+            Assert.AreEqual("{token:https://graph.microsoft.com/}", message.Headers.Authorization.Parameter);
+        }
+    }
+}

UnitTests/UnitTests.UWP/SmokeTest.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace UnitTests.UWP
+{
+    /// <summary>
+    /// A super basic dummy test to make sure the test harness is prepared properly and ready for more tests.
+    /// </summary>
+    [TestClass]
+    public class SmokeTest
+    {
+        [TestCategory("SmokeTest")]
+        [TestMethod]
+        public void TrueIsTrue()
+        {
+            Assert.IsTrue(true);
+        }
+    }
+}

UnitTests/UnitTests.UWP/UnitTestApp.xaml

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+<Application
+    x:Class="UnitTests.UWP.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:UnitTests.UWP">
+
+</Application>