code: public static WarpExecutionBuilder initiate(Activity activity) {
  
          WarpRuntime runtime = WarpRuntime.getInstance();
  
          if (runtime == null) {
              throw new IllegalStateException(
                  "The Warp runtime isn't initialized. You need to make sure arquillian-warp-impl is on classpath and annotate a test class with @WarpTest in order to initialize Warp.");
          }
  
          return runtime.getWarpActivityBuilder().initiate(activity);
      }
docs: Takes client activity which should be performed in order to cause server request.
  
  @param activity the client activity to execute
  @return {@link WarpActivityBuilder} instance