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Combining items from an item pool into test forms (test assembly) is a frequent task in psychological and educational testing. Although efficient methods for automated test assembly exist, these are often unknown or unavailable to practitioners. In this paper we present the <span style="font-family: monospace;">R</span> package <span style="font-family: monospace;">eatATA</span>, which allows using several mixed-integer programming solvers for automated test assembly in <span style="font-family: monospace;">R</span>. We describe the general functionality and the common work flow of <span style="font-family: monospace;">eatATA</span> using a minimal example. We also provide four more elaborate use cases of automated test assembly: (a) The assembly of multiple test forms for a pilot study; (b) the assembly of blocks of items for a multiple matrix booklet design in the context of a large-scale assessment; (c) the assembly of two linear test forms for individual diagnostic purposes; (d) the assembly of multi-stage testing modules for individual diagnostic purposes. All use cases are accompanied with example item pools and commented <span style="font-family: monospace;">R</span> code.