Acceptance test are a great tool to verify that the application or system works as expected from end to end. Sometimes these tests can be called as end-to-end tests but sometimes end-to-end tests have a different meaning. Another term to describe the same functionality is QA tests and a subset of acceptance tests is often referred as smoke tests. The idea The idea is to define a input and the expected output and once the system and all it's dependant services are running the whole system can be verified to work as expected. In a ideal world the acceptance tests would be implemented based on the acceptance criteria of the use case. The implementation Acceptance tests can and should be implemented in the code just like unit and integration tests are implemented. The acceptance tests don't neccessarily reside in the same code repository as the code but they can, depending on what's the need. When a system is API the acceptance tests could be e.g. predefined HTTP requests with ...
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