While their updates can break automated tests (just as any update can), mitigating the impact is simple enough. First, we design our tests to be “atomic,” that is the test cases are narrowly-defined, so if something breaks it doesn’t have reverberating impacts. Second, Salesforce is generous enough to provide their updates in preview environments several weeks ahead of the public release. During this time, we monitor the changes and make any updates, preventing any gaps in coverage on your production systems.