Automation testing is mostly a black box testing as we just program the steps that a manual tester performs for application under test without knowing the low-level design or code of the application.
Sometimes, automated test scripts need access to the database details that are used in the application under test or some more coding details and thus can be a type of white-box testing.
Thus automated testing can be both black or white box type of testing depending on the scenarios in which automation is performed.
