public async Task CanChangeEmail()
{
// Arrange
var emails = new ContosoEmailSender();
void ConfigureTestServices(IServiceCollection services) =>
services.SetupTestEmailSender(emails);
var server = ServerFactory
.WithWebHostBuilder(whb => whb.ConfigureServices(ConfigureTestServices));
var client = server.CreateClient();
var newClient = server.CreateClient();
var failedClient = server.CreateClient();
var userName = $"{Guid.NewGuid()}@example.com";
var password = $"[PLACEHOLDER]-1a";
var newEmail = "*****@*****.**";
var index = await UserStories.RegisterNewUserAsync(client, userName, password);
var email = await UserStories.SendUpdateEmailAsync(index, newEmail);
// Act & Assert
Assert.Equal(2, emails.SentEmails.Count);
await UserStories.ConfirmEmailAsync(emails.SentEmails[1], client);
// Verify can login with new email, fails with old
await UserStories.LoginExistingUserAsync(newClient, newEmail, password);
await UserStories.LoginFailsWithWrongPasswordAsync(failedClient, userName, password);
}