public async Task SignOutFormPostWithDefaultRedirectUri()
        {
            var settings = new TestSettings(o =>
            {
                o.AuthenticationMethod = OpenIdConnectRedirectBehavior.FormPost;
                o.Authority            = TestServerBuilder.DefaultAuthority;
                o.ClientId             = "Test Id";
            });
            var server = settings.CreateTestServer();

            var transaction = await server.SendAsync(DefaultHost + TestServerBuilder.Signout);

            Assert.Equal(HttpStatusCode.OK, transaction.Response.StatusCode);

            settings.ValidateSignoutFormPost(transaction,
                                             OpenIdConnectParameterNames.PostLogoutRedirectUri);
        }