Pact is a contract testing tool. Contract testing is a way to ensure that services (such as an API provider and a client) can communicate with each other. Without contract testing, the only way to know that services can communicate is by using expensive and brittle integration tests.
![[英文]Pact: A contract testing tool](https://static.sitestack.cn/projects/pact-en/uploads/201807/15447280bfceaec3.png/cover)