fix some issue and cover by test (#669)

tests/FunctionalTests/Web/Pages/Basket/BasketPageCheckout.cs

@@ -0,0 +1,50 @@
+using Microsoft.AspNetCore.Mvc.Testing;
+using Xunit;
+
+namespace Microsoft.eShopWeb.FunctionalTests.Web.Pages.Basket;
+
+[Collection("Sequential")]
+public class BasketPageCheckout : IClassFixture<TestApplication>
+{
+    public BasketPageCheckout(TestApplication factory)
+    {
+        Client = factory.CreateClient(new WebApplicationFactoryClientOptions
+        {
+            AllowAutoRedirect = true
+        });
+    }
+
+    public HttpClient Client { get; }
+
+    [Fact]
+    public async Task RedirectsToLoginIfNotAuthenticated()
+    {
+
+        // Load Home Page
+        var response = await Client.GetAsync("/");
+        response.EnsureSuccessStatusCode();
+        var stringResponse1 = await response.Content.ReadAsStringAsync();
+
+        string token = WebPageHelpers.GetRequestVerificationToken(stringResponse1);
+
+        // Add Item to Cart
+        var keyValues = new List<KeyValuePair<string, string>>
+        {
+            new KeyValuePair<string, string>("id", "2"),
+            new KeyValuePair<string, string>("name", "shirt"),
+            new KeyValuePair<string, string>("price", "19.49"),
+            new KeyValuePair<string, string>("__RequestVerificationToken", token)
+        };
+        var formContent = new FormUrlEncodedContent(keyValues);
+        var postResponse = await Client.PostAsync("/basket/index", formContent);
+        postResponse.EnsureSuccessStatusCode();
+        var stringResponse = await postResponse.Content.ReadAsStringAsync();
+        Assert.Contains(".NET Black &amp; White Mug", stringResponse);
+
+        keyValues.Clear();
+
+        formContent = new FormUrlEncodedContent(keyValues);
+        var postResponse2 = await Client.PostAsync("/Basket/Checkout", formContent);
+        Assert.Contains("/Identity/Account/Login", postResponse2.RequestMessage.RequestUri.ToString());
+    }
+}