@Test
    public void testRegisterShouldFailBeforeUserCreationWhenUserIsInContext() throws Exception {
        try (AutoCloseable c = new RealmAttributeUpdater(testRealmResource())
            .updateWith(r -> {
                Map<String, String> config = new HashMap<>();
                config.put("from", "[email protected]");
                config.put("host", "localhost");
                config.put("port", "3025");
                r.setSmtpServer(config);
                r.setRegistrationAllowed(true);
                r.setVerifyEmail(true);
                r.setResetPasswordAllowed(true);
                r.setRegistrationEmailAsUsername(true);
            })
            .update()) {

            UserRepresentation userWhoPreExistsInRealm = new UserRepresentation();
            userWhoPreExistsInRealm.setEmail("[email protected]");
            ApiUtil.createUserAndResetPasswordWithAdminClient(testRealmResource(), userWhoPreExistsInRealm, "password");

            testRealmAccountPage.navigateTo();
            loginPage.clickRegister();
            registerPage.clickBackToLogin();
            loginPage.assertCurrent(testRealmResource().toRepresentation().getRealm());

            loginPage.resetPassword();
            resetPage.assertCurrent();
            resetPage.changePassword("[email protected]");

            driver.navigate().back();
            driver.navigate().back();
            driver.navigate().back();
            registerPage.assertCurrent();

            registerPage.registerWithEmailAsUsername(
                "Vilmos",
                "Szabó-Nagy",
                "[email protected]",
                "TestPassword123",
                "TestPassword123"
            );

            errorPage.assertCurrent();
            assertEquals("The error page is shown", "Invalid username or password.", errorPage.getError()); // it does not fail here, the error page is shown

            // the user entity should not be created if the registration flow is not executed till the end
            final UserRepresentation userByUsername = ApiUtil.findUserByUsername(testRealmResource(), "[email protected]");
            assertNull(userByUsername); // it fails here
        }
    }