envelope = backendProbe.expectMsgClass(RequestEnvelope.class);
final Class<?> actual = envelope.getMessage().getClass();
final String errorMsg = String.format("Expected instance of %s, received %s", expected, actual);
envelope = backendProbe.expectMsgClass(RequestEnvelope.class);
final Class<?> actual = envelope.getMessage().getClass();
final String errorMsg = String.format("Expected instance of %s, received %s", expected, actual);