code: private static DesiredCapabilities getAdditionalDesiredCapabilities(String clazz, ITestContext context) {
          return (DesiredCapabilities) context.getAttribute(clazz + DESIRED_CAPABILITIES);
      }
docs: Retrieves the additional desired capabilities set by the current class for the browsers
  
  @param clazz   - the test suite class, used for making threadsafe storage of
  application, allowing suites to have independent applications
  under test, run at the same time
  @param context - the TestNG context associated with the test suite, used for
  storing app url information
  @return DesiredCapabilities