What happened:

When testing multiple TXT records, the test plugin asserts wrongly the records after the first one on the value of the first one.

What you expected to happen:

TXT records are correctly asserted.

How to reproduce it (as minimally and precisely as possible):

Check k8s-gateway/k8s_gateway#108

Anything else we need to know?:

There seem to be a loop in https://github.com/coredns/coredns/blob/master/plugin/test/helpers.go#L209 that does not distinguish between 2 different TXT records and a TXT record split because it is longer than 255 bytes.