Ask HN: Microservices testing best practises?

Hello fellow developers, architects, tech leads, Two years ago In my current company we started migration into microservices. The whole project happen without any plan in place. microservices were created ad-hoc, when someone wanted to create something new or just migrated a part of monolith API. We end up having around 15 coupled services. The problem we are facing now are the tests. As we don't have client libraries - project were e.g. User microService is implemented, mock its methods during unit/functional test. Mocks are part of the project consuming this service. Integration tests are done manually on staging. Because of that if something in the given microservices changes we are unable to detect the problem (unless someone spots it on staging). It happens often as developers do not update mocks in depended projects. In future we will run integration testing in docker using endpoints not mock but first we have to migrate our build environment to support docker. Few ques