add email check

TeachingRecordSystem/src/TeachingRecordSystem.AuthorizeAccess/Pages/RequestTrn/Email.cshtml.cs

@@ -40,7 +40,6 @@ public async Task<IActionResult> OnPost()
             return Redirect(linkGenerator.RequestTrnEmailInUse(JourneyInstance!.InstanceId));
         }
 
-
         return FromCheckAnswers == true ?
             Redirect(linkGenerator.RequestTrnCheckAnswers(JourneyInstance!.InstanceId)) :
             Redirect(linkGenerator.RequestTrnName(JourneyInstance.InstanceId));

TeachingRecordSystem/src/TeachingRecordSystem.AuthorizeAccess/Pages/RequestTrn/EmailInUse.cshtml.cs

@@ -1,15 +1,21 @@
+using Microsoft.AspNetCore.Mvc.Filters;
 using Microsoft.AspNetCore.Mvc.RazorPages;
 using TeachingRecordSystem.UiCommon.FormFlow;
 
 namespace TeachingRecordSystem.AuthorizeAccess.Pages.RequestTrn;
 
 [Journey(RequestTrnJourneyState.JourneyName), RequireJourneyInstance]
-public class EmailInUseModel : PageModel
+public class EmailInUseModel(AuthorizeAccessLinkGenerator linkGenerator) : PageModel
 {
     public JourneyInstance<RequestTrnJourneyState>? JourneyInstance { get; set; }
 
-    public void OnGet()
+    public override void OnPageHandlerExecuting(PageHandlerExecutingContext context)
     {
+        var state = JourneyInstance!.State;
+        if (state.Email is null)
+        {
+            context.Result = Redirect(linkGenerator.RequestTrnEmail(JourneyInstance.InstanceId));
+        }
     }
 }
 

TeachingRecordSystem/tests/TeachingRecordSystem.AuthorizeAccess.Tests/PageTests/RequestTrn/EmailInUseTests.cs

@@ -0,0 +1,22 @@
+namespace TeachingRecordSystem.AuthorizeAccess.Tests.PageTests.RequestTrn;
+
+public class EmailInUseTests(HostFixture hostFixture) : TestBase(hostFixture)
+{
+    [Fact]
+    public async Task Get_WithoutEmailAddress_RedirectsToEmail()
+    {
+        // Arrange
+        var state = CreateNewState();
+        state.HasPendingTrnRequest = true;
+        var journeyInstance = await CreateJourneyInstance(state);
+
+        var request = new HttpRequestMessage(HttpMethod.Get, $"/request-trn/emailinuse?{journeyInstance.GetUniqueIdQueryParameter()}");
+
+        // Act
+        var response = await HttpClient.SendAsync(request);
+
+        // Assert
+        Assert.Equal(StatusCodes.Status302Found, (int)response.StatusCode);
+        Assert.Equal($"/request-trn/email?{journeyInstance.GetUniqueIdQueryParameter()}", response.Headers.Location?.OriginalString);
+    }
+}