public ZipkinExtension enqueueFailure(HttpFailure failure) {
    failureQueue.add(failure.response);
    return this;
  }
Adds a one-time failure to the http endpoint.

<p>Ex. If you want to test that you don't repeatedly send bad data, you could send a 400 back.

<pre>{@code
zipkin.enqueueFailure(sendErrorResponse(400, "bad format"));
}</pre>

@param failure type of failure the next call to the http endpoint responds with
zipkin-junit5/src/main/java/zipkin2/junit5/ZipkinExtension.java