Adding functional tests (#197)

* Working on login tests

* Testing login with an integration test

Working on login functional test.

* Got functional login test working

tests/IntegrationTests/LoginService.cs

@@ -0,0 +1,56 @@
+using Microsoft.EntityFrameworkCore;
+using Xunit;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.eShopWeb.Infrastructure.Identity;
+using System;
+using Microsoft.AspNetCore.Identity;
+using System.Threading.Tasks;
+
+namespace Microsoft.eShopWeb.IntegrationTests.Repositories.OrderRepositoryTests
+{
+    public class LoginService
+    {
+        [Fact]
+        public async Task LogsInSampleUser()
+        {
+            var services = new ServiceCollection()
+                                .AddEntityFrameworkInMemoryDatabase();
+
+            services.AddDbContext<AppIdentityDbContext>(options =>
+            {
+                options.UseInMemoryDatabase("Identity");
+            });
+            var serviceProvider = new ServiceCollection()
+                .BuildServiceProvider();
+
+            // Create a scope to obtain a reference to the database
+            // context (AppIdentityDbContext).
+            using (var scope = serviceProvider.CreateScope())
+            {
+                var scopedServices = scope.ServiceProvider;
+
+                try
+                {
+                    // seed sample user data
+                    var userManager = scopedServices.GetRequiredService<UserManager<ApplicationUser>>();
+
+                    AppIdentityDbContextSeed.SeedAsync(userManager).Wait();
+
+                    var signInManager = scopedServices.GetRequiredService<SignInManager<ApplicationUser>>();
+
+                    var email = "demouser@microsoft.com";
+                    var password = "Pass@word1";
+
+                    var result = await signInManager.PasswordSignInAsync(email, password, false, lockoutOnFailure: false);
+
+                    Assert.True(result.Succeeded);
+
+                }
+                catch (Exception ex)
+                {
+                }
+            }
+
+        }
+    }
+}