We test our Java code, our APIs, our frontend, and even our infrastructure. Yet database migrations—one of the most critical and high-risk parts of any application deployment—often remain a total "black box".

For most teams, testing database migrations looks like this:

Write a SQL migration file (V1_1__add_user_statuses.sql).

Run the application locally or deploy it to a staging environment.

Watch it fail because of a syntax error, a mismatched column type, or a violated constraint.