Both of the tests (Err-025-01 and 02) do not seem to modify the response size value.
It looks like an equals sign has been missed from the test. We verified below proposed change by observed CTT behavior in Wireshark.

I believe Err-025-01 should be like this:

// Increase the number of results by 1
function readResponseErr02501(request, response) {

response.Results.length += 1;
response.Results[response.Results.length - 1] = response.Results[response.Results.length - 2];

}

And also I think Err-025-02 should be:

// Decrease the number of results by 1
function readResponseErr02502(request, response) {

response.Results.length -= 1;

}