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If I have a unit test, and I want it to be able to run the test with different inputs... is that sharding? or is that just having an arg for your test?

By your description it seems like table testing

<https://kotest.io/docs/framework/datatesting/data-driven-testing.html>

<https://junit.org/junit5/docs/current/user-guide/#writing-tests-parameterized-tests> in JUnit 5, <https://github.com/junit-team/junit4/wiki/Parameterized-tests> in JUnit 4