code: @ConditionBlock
    public void evaluate(Runnable block) {
      try {
        block.run();
      } catch (Throwable t) {
        exceptions.add(t);
        wakeUp();
      }
      latch.countDown();
    }
docs: Evaluates the specified block, which is expected to contain
  one or more explicit conditions (i.e. assert statements).
  Any caught exception will be rethrown from <tt>await()</tt>.
  
  @param block the code block to evaluate