Auth/PM-6198 - Registration with Email Verification - Add email clicked endpoint (#4520)

* PM-6198 - RegistrationEmailVerificationTokenable - add new static validate token method

* PM-6198 - Rename RegistrationStart to Registration as we now have to add another anonymous reference event.

* PM-6198 - rest of work

* PM-6198 - Unit test new account controller method.

* PM-6198 - Integration test new account controller endpoint

test/Identity.IntegrationTest/Controllers/AccountsControllerTests.cs

@@ -268,6 +268,43 @@ public class AccountsControllerTests : IClassFixture<IdentityApplicationFactory>
         Assert.Equal(kdfParallelism, user.KdfParallelism);
     }
 
+    [Theory, BitAutoData]
+    public async Task PostRegisterVerificationEmailClicked_Success(
+        [Required, StringLength(20)] string name,
+        string emailVerificationToken)
+    {
+        // Arrange
+        // Localize substitutions to this test.
+        var localFactory = new IdentityApplicationFactory();
+
+        var email = $"test+register+{name}@email.com";
+        var registrationEmailVerificationTokenable = new RegistrationEmailVerificationTokenable(email);
+
+        localFactory.SubstituteService<IDataProtectorTokenFactory<RegistrationEmailVerificationTokenable>>(emailVerificationTokenDataProtectorFactory =>
+        {
+            emailVerificationTokenDataProtectorFactory.TryUnprotect(Arg.Is(emailVerificationToken), out Arg.Any<RegistrationEmailVerificationTokenable>())
+                .Returns(callInfo =>
+                {
+                    callInfo[1] = registrationEmailVerificationTokenable;
+                    return true;
+                });
+        });
+
+        var requestModel = new RegisterVerificationEmailClickedRequestModel
+        {
+            Email = email,
+            EmailVerificationToken = emailVerificationToken
+        };
+
+        // Act
+        var httpContext = await localFactory.PostRegisterVerificationEmailClicked(requestModel);
+
+        var body = await httpContext.ReadBodyAsStringAsync();
+
+        // Assert
+        Assert.Equal(StatusCodes.Status200OK, httpContext.Response.StatusCode);
+    }
+
     private async Task<User> CreateUserAsync(string email, string name, IdentityApplicationFactory factory = null)
     {
         var factoryToUse = factory ?? _factory;