code: @Override
      public <T> T getContext(Class<T> type) {
          for (Context context : contexts) {
              if (type.isInstance(context)) {
                  return type.cast(context);
              }
          }
          return null;
      }
docs: /* (non-Javadoc)
  @see org.jboss.arquillian.spi.Manager#getContext(java.lang.Class)