Developers should execute tests on their local machine before opening a merge request for their code. That way, they can be confident that any of the changes they made did not break any of the previous behaviors of their code. In theory, this provides the guarantee that all code merged to the master branch compiles and has all tests passing. In practice, there are many reasons why this is not the case. Some can be as follows:
- Some tests might not be able to be run locally. They depend on confidential configuration values or are configured to run against a fully configured system. One or both of these are often the case for system tests. There are many situations where it is impossible to run system tests from the local system. Not all of these situations are necessarily desirable or insurmountable—but still, this is often the case.
- Developers...
