My ex-colleague Daniel has a bloody excellent conference talk on building Microservices, though it’s not testing specific:
I actually wrote a case study reflecting on testing a microservices application for our company blog, but it got taken down as we wanted to maintain more client confidentiality. I may try to republish it and anonymise the particular client/system, as I feel there are some excellent lessons within it!
Recently, I have involved into testing and automation of microservices a lot.
Here is the most useful resources I found. It also contains materials on contract testing as well.
I hope, it will help others to get into microservices deeply.