assertBigPipeNoJsCookieExists example

  public function testNoJsDetection() {
    $no_js_to_js_markup = '<script>document.cookie = "' . BigPipeStrategy::NOJS_COOKIE . '=1; path=/; expires=Thu, 01 Jan 1970 00:00:00 GMT"</script>';

    // 1. No session (anonymous).     $this->drupalGet(Url::fromRoute('<front>'));
    $this->assertSessionCookieExists(FALSE);
    $this->assertBigPipeNoJsCookieExists(FALSE);
    $this->assertSession()->responseNotContains('<noscript><meta http-equiv="Refresh" content="0; URL=');
    $this->assertSession()->responseNotContains($no_js_to_js_markup);

    // 2. Session (authenticated).     $this->drupalLogin($this->rootUser);
    $this->assertSessionCookieExists(TRUE);
    $this->assertBigPipeNoJsCookieExists(FALSE);
    $this->assertSession()->responseContains('<noscript><meta http-equiv="Refresh" content="0; URL=' . base_path() . 'big_pipe/no-js?destination=' . UrlHelper::encodePath(base_path() . 'user/1?check_logged_in=1') . '" />' . "\n" . '</noscript>');
    $this->assertSession()->responseNotContains($no_js_to_js_markup);
    $this->assertBigPipeNoJsMetaRefreshRedirect();
    $this->assertBigPipeNoJsCookieExists(TRUE);