.java

    import org.openqa.selenium.WebDriver;


    static WebDriver browser;

    @Before
    public void initBrowser() {
        HtmlUnitTestDriver d = new HtmlUnitTestDriver();
        d.getWebClient().getOptions().setJavaScriptEnabled(true);
        d.getWebClient().getOptions().setCssEnabled(false);
        d.getWebClient().getOptions().setTimeout(1000000);
        browser = d;
    }
    
    @Test
    public void testRedirectToIdPLoginAuthenticateServeAndRequestDifferentContext() throws InterruptedException {
        browser.get("http://localhost:8082/web-module-3/");
        assertAtLoginPagePostBinding();
        LoginPage loginPage = PageFactory.initElements(browser, LoginPage.class);
        loginPage.login("bburke", "password");
        assertAtModuleContext("/web-module-3");
        // Make a request from the same browser another context
        // Invokes a servlet that displays user's principal name
        JavascriptExecutor je = (JavascriptExecutor) browser;
        Object response = ((JavascriptExecutor) browser).executeAsyncScript(
                "var callback = arguments[arguments.length - 1];"
                + "var xhr = new XMLHttpRequest();"
                + "xhr.open('GET', 'http://localhost:8082/web-module-4/saml-session-info', true);"
                + "xhr.onreadystatechange = function() {"
                + "  if (xhr.readyState == 4) {"
                + "    callback(xhr.responseText);"
                + "  }"
                + "};"
                + "xhr.send();");
        Assert.assertTrue(((String)response).contains("bburke"));
        browser.close();
    }